diff --git a/src/Monolog/Formatter/LogmaticFormatter.php b/src/Monolog/Formatter/LogmaticFormatter.php
index 8c6ff2f4..e0d44980 100644
--- a/src/Monolog/Formatter/LogmaticFormatter.php
+++ b/src/Monolog/Formatter/LogmaticFormatter.php
@@ -30,14 +30,18 @@ class LogmaticFormatter extends JsonFormatter
      */
     protected $appname = '';
 
-    public function setHostname(string $hostname)
+    public function setHostname(string $hostname): self
     {
         $this->hostname = $hostname;
+
+        return $this;
     }
 
-    public function setAppname(string $appname)
+    public function setAppname(string $appname): self
     {
         $this->appname = $appname;
+
+        return $this;
     }
 
     /**
diff --git a/src/Monolog/Formatter/NormalizerFormatter.php b/src/Monolog/Formatter/NormalizerFormatter.php
index 907efa96..6672bf92 100644
--- a/src/Monolog/Formatter/NormalizerFormatter.php
+++ b/src/Monolog/Formatter/NormalizerFormatter.php
@@ -67,9 +67,11 @@ class NormalizerFormatter implements FormatterInterface
         return $this->maxNormalizeDepth;
     }
 
-    public function setMaxNormalizeDepth(int $maxNormalizeDepth): void
+    public function setMaxNormalizeDepth(int $maxNormalizeDepth): self
     {
         $this->maxNormalizeDepth = $maxNormalizeDepth;
+
+        return $this;
     }
 
     /**
@@ -80,9 +82,11 @@ class NormalizerFormatter implements FormatterInterface
         return $this->maxNormalizeItemCount;
     }
 
-    public function setMaxNormalizeItemCount(int $maxNormalizeItemCount): void
+    public function setMaxNormalizeItemCount(int $maxNormalizeItemCount): self
     {
         $this->maxNormalizeItemCount = $maxNormalizeItemCount;
+
+        return $this;
     }
 
     /**
diff --git a/src/Monolog/Handler/AbstractSyslogHandler.php b/src/Monolog/Handler/AbstractSyslogHandler.php
index 9a9b5238..b7f249d7 100644
--- a/src/Monolog/Handler/AbstractSyslogHandler.php
+++ b/src/Monolog/Handler/AbstractSyslogHandler.php
@@ -54,7 +54,7 @@ abstract class AbstractSyslogHandler extends AbstractProcessingHandler
     ];
 
     /**
-     * @param mixed      $facility
+     * @param string|int $facility Either one of the names of the keys in $this->facilities, or a LOG_* facility constant
      * @param string|int $level    The minimum logging level at which this handler will be triggered
      * @param bool       $bubble   Whether the messages that are handled can bubble up the stack or not
      */
diff --git a/src/Monolog/Handler/CubeHandler.php b/src/Monolog/Handler/CubeHandler.php
index 8829eafd..298e572a 100644
--- a/src/Monolog/Handler/CubeHandler.php
+++ b/src/Monolog/Handler/CubeHandler.php
@@ -80,13 +80,15 @@ class CubeHandler extends AbstractProcessingHandler
     }
 
     /**
-     * Establish a connection to a http server
-     * @throws \LogicException when no curl extension
+     * Establish a connection to an http server
+     *
+     * @throws \LogicException           when unable to connect to the socket
+     * @throws MissingExtensionException when no curl extension
      */
     protected function connectHttp(): void
     {
         if (!extension_loaded('curl')) {
-            throw new \LogicException('The curl extension is needed to use http URLs with the CubeHandler');
+            throw new MissingExtensionException('The curl extension is required to use http URLs with the CubeHandler');
         }
 
         $this->httpConnection = curl_init('http://'.$this->host.':'.$this->port.'/1.0/event/put');
diff --git a/src/Monolog/Handler/FleepHookHandler.php b/src/Monolog/Handler/FleepHookHandler.php
index 2740b883..91781003 100644
--- a/src/Monolog/Handler/FleepHookHandler.php
+++ b/src/Monolog/Handler/FleepHookHandler.php
@@ -41,11 +41,11 @@ class FleepHookHandler extends SocketHandler
      * see https://fleep.io/integrations/webhooks/
      *
      * @param  string                    $token  Webhook token
-     * @param  bool|int                  $level  The minimum logging level at which this handler will be triggered
+     * @param  string|int                $level  The minimum logging level at which this handler will be triggered
      * @param  bool                      $bubble Whether the messages that are handled can bubble up the stack or not
      * @throws MissingExtensionException
      */
-    public function __construct($token, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct(string $token, $level = Logger::DEBUG, bool $bubble = true)
     {
         if (!extension_loaded('openssl')) {
             throw new MissingExtensionException('The OpenSSL PHP extension is required to use the FleepHookHandler');
@@ -71,8 +71,6 @@ class FleepHookHandler extends SocketHandler
 
     /**
      * Handles a log record
-     *
-     * @param array $record
      */
     public function write(array $record): void
     {
@@ -82,11 +80,8 @@ class FleepHookHandler extends SocketHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param  array  $record
-     * @return string
      */
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         $content = $this->buildContent($record);
 
@@ -95,11 +90,8 @@ class FleepHookHandler extends SocketHandler
 
     /**
      * Builds the header of the API Call
-     *
-     * @param  string $content
-     * @return string
      */
-    private function buildHeader($content)
+    private function buildHeader(string $content): string
     {
         $header = "POST " . self::FLEEP_HOOK_URI . $this->token . " HTTP/1.1\r\n";
         $header .= "Host: " . self::FLEEP_HOST . "\r\n";
@@ -112,11 +104,8 @@ class FleepHookHandler extends SocketHandler
 
     /**
      * Builds the body of API call
-     *
-     * @param  array  $record
-     * @return string
      */
-    private function buildContent($record)
+    private function buildContent(array $record): string
     {
         $dataArray = [
             'message' => $record['formatted'],
diff --git a/src/Monolog/Handler/FlowdockHandler.php b/src/Monolog/Handler/FlowdockHandler.php
index 09666622..be46d032 100644
--- a/src/Monolog/Handler/FlowdockHandler.php
+++ b/src/Monolog/Handler/FlowdockHandler.php
@@ -34,13 +34,12 @@ class FlowdockHandler extends SocketHandler
     protected $apiToken;
 
     /**
-     * @param string   $apiToken
-     * @param bool|int $level    The minimum logging level at which this handler will be triggered
-     * @param bool     $bubble   Whether the messages that are handled can bubble up the stack or not
+     * @param string|int $level  The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble Whether the messages that are handled can bubble up the stack or not
      *
      * @throws MissingExtensionException if OpenSSL is missing
      */
-    public function __construct($apiToken, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct(string $apiToken, $level = Logger::DEBUG, bool $bubble = true)
     {
         if (!extension_loaded('openssl')) {
             throw new MissingExtensionException('The OpenSSL PHP extension is required to use the FlowdockHandler');
@@ -84,11 +83,8 @@ class FlowdockHandler extends SocketHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param  array  $record
-     * @return string
      */
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         $content = $this->buildContent($record);
 
@@ -97,22 +93,16 @@ class FlowdockHandler extends SocketHandler
 
     /**
      * Builds the body of API call
-     *
-     * @param  array  $record
-     * @return string
      */
-    private function buildContent($record)
+    private function buildContent(array $record): string
     {
         return json_encode($record['formatted']['flowdock']);
     }
 
     /**
      * Builds the header of the API Call
-     *
-     * @param  string $content
-     * @return string
      */
-    private function buildHeader($content)
+    private function buildHeader(string $content): string
     {
         $header = "POST /v1/messages/team_inbox/" . $this->apiToken . " HTTP/1.1\r\n";
         $header .= "Host: api.flowdock.com\r\n";
diff --git a/src/Monolog/Handler/FormattableHandlerTrait.php b/src/Monolog/Handler/FormattableHandlerTrait.php
index b1f1b588..00140b4e 100644
--- a/src/Monolog/Handler/FormattableHandlerTrait.php
+++ b/src/Monolog/Handler/FormattableHandlerTrait.php
@@ -53,8 +53,6 @@ trait FormattableHandlerTrait
      * Gets the default formatter.
      *
      * Overwrite this if the LineFormatter is not a good default for your handler.
-     *
-     * @return FormatterInterface
      */
     protected function getDefaultFormatter(): FormatterInterface
     {
diff --git a/src/Monolog/Handler/GelfHandler.php b/src/Monolog/Handler/GelfHandler.php
index b5c11355..d6965fa7 100644
--- a/src/Monolog/Handler/GelfHandler.php
+++ b/src/Monolog/Handler/GelfHandler.php
@@ -31,7 +31,7 @@ class GelfHandler extends AbstractProcessingHandler
 
     /**
      * @param PublisherInterface $publisher a publisher object
-     * @param int                $level     The minimum logging level at which this handler will be triggered
+     * @param string|int         $level     The minimum logging level at which this handler will be triggered
      * @param bool               $bubble    Whether the messages that are handled can bubble up the stack or not
      */
     public function __construct(PublisherInterface $publisher, $level = Logger::DEBUG, bool $bubble = true)
diff --git a/src/Monolog/Handler/GroupHandler.php b/src/Monolog/Handler/GroupHandler.php
index 309d3be9..3aa1201c 100644
--- a/src/Monolog/Handler/GroupHandler.php
+++ b/src/Monolog/Handler/GroupHandler.php
@@ -26,8 +26,8 @@ class GroupHandler extends Handler implements ProcessableHandlerInterface, Reset
     protected $handlers;
 
     /**
-     * @param array $handlers Array of Handlers.
-     * @param bool  $bubble   Whether the messages that are handled can bubble up the stack or not
+     * @param HandlerInterface[] $handlers Array of Handlers.
+     * @param bool               $bubble   Whether the messages that are handled can bubble up the stack or not
      */
     public function __construct(array $handlers, bool $bubble = true)
     {
@@ -114,7 +114,7 @@ class GroupHandler extends Handler implements ProcessableHandlerInterface, Reset
     /**
      * {@inheritdoc}
      */
-    public function setFormatter(FormatterInterface $formatter)
+    public function setFormatter(FormatterInterface $formatter): HandlerInterface
     {
         foreach ($this->handlers as $handler) {
             $handler->setFormatter($formatter);
diff --git a/src/Monolog/Handler/HandlerWrapper.php b/src/Monolog/Handler/HandlerWrapper.php
index c44b7036..dfbc16d1 100644
--- a/src/Monolog/Handler/HandlerWrapper.php
+++ b/src/Monolog/Handler/HandlerWrapper.php
@@ -38,10 +38,6 @@ class HandlerWrapper implements HandlerInterface, ProcessableHandlerInterface, F
      */
     protected $handler;
 
-    /**
-     * HandlerWrapper constructor.
-     * @param HandlerInterface $handler
-     */
     public function __construct(HandlerInterface $handler)
     {
         $this->handler = $handler;
diff --git a/src/Monolog/Handler/HipChatHandler.php b/src/Monolog/Handler/HipChatHandler.php
index ce09299d..4ef6b253 100644
--- a/src/Monolog/Handler/HipChatHandler.php
+++ b/src/Monolog/Handler/HipChatHandler.php
@@ -70,18 +70,27 @@ class HipChatHandler extends SocketHandler
     private $host;
 
     /**
-     * @param string $token  HipChat API Token
-     * @param string $room   The room that should be alerted of the message (Id or Name)
-     * @param string $name   Name used in the "from" field.
-     * @param bool   $notify Trigger a notification in clients or not
-     * @param int    $level  The minimum logging level at which this handler will be triggered
-     * @param bool   $bubble Whether the messages that are handled can bubble up the stack or not
-     * @param bool   $useSSL Whether to connect via SSL.
-     * @param string $format The format of the messages (default to text, can be set to html if you have html in the messages)
-     * @param string $host   The HipChat server hostname.
+     * @param string      $token  HipChat API Token
+     * @param string      $room   The room that should be alerted of the message (Id or Name)
+     * @param string|null $name   Name used in the "from" field.
+     * @param bool        $notify Trigger a notification in clients or not
+     * @param string|int  $level  The minimum logging level at which this handler will be triggered
+     * @param bool        $bubble Whether the messages that are handled can bubble up the stack or not
+     * @param bool        $useSSL Whether to connect via SSL.
+     * @param string      $format The format of the messages (default to text, can be set to html if you have html in the messages)
+     * @param string      $host   The HipChat server hostname.
      */
-    public function __construct($token, $room, $name = 'Monolog', $notify = false, $level = Logger::CRITICAL, bool $bubble = true, $useSSL = true, $format = 'text', $host = 'api.hipchat.com')
-    {
+    public function __construct(
+        string $token,
+        string $room,
+        ?string $name = 'Monolog',
+        bool $notify = false,
+        $level = Logger::CRITICAL,
+        bool $bubble = true,
+        bool $useSSL = true,
+        string $format = 'text',
+        string $host = 'api.hipchat.com'
+    ) {
         $connectionString = $useSSL ? 'ssl://'.$host.':443' : $host.':80';
         parent::__construct($connectionString, $level, $bubble);
 
@@ -95,11 +104,8 @@ class HipChatHandler extends SocketHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param  array  $record
-     * @return string
      */
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         $content = $this->buildContent($record);
 
@@ -108,11 +114,8 @@ class HipChatHandler extends SocketHandler
 
     /**
      * Builds the body of API call
-     *
-     * @param  array  $record
-     * @return string
      */
-    private function buildContent($record)
+    private function buildContent(array $record): string
     {
         $dataArray = [
             'notify' => $this->notify ? 'true' : 'false',
@@ -296,13 +299,8 @@ class HipChatHandler extends SocketHandler
      * Note that this might cause false failures in the specific case of using
      * a valid name with less than 16 characters, but 16 or more bytes, on a
      * system where `mb_strlen()` is unavailable.
-     *
-     * @param string $str
-     * @param int    $length
-     *
-     * @return bool
      */
-    private function validateStringLength($str, $length)
+    private function validateStringLength(string $str, int $length): bool
     {
         if (function_exists('mb_strlen')) {
             return (mb_strlen($str) <= $length);
diff --git a/src/Monolog/Handler/IFTTTHandler.php b/src/Monolog/Handler/IFTTTHandler.php
index 669b3f36..21043c50 100644
--- a/src/Monolog/Handler/IFTTTHandler.php
+++ b/src/Monolog/Handler/IFTTTHandler.php
@@ -30,12 +30,12 @@ class IFTTTHandler extends AbstractProcessingHandler
     private $secretKey;
 
     /**
-     * @param string $eventName The name of the IFTTT Maker event that should be triggered
-     * @param string $secretKey A valid IFTTT secret key
-     * @param int    $level     The minimum logging level at which this handler will be triggered
-     * @param bool   $bubble    Whether the messages that are handled can bubble up the stack or not
+     * @param string     $eventName The name of the IFTTT Maker event that should be triggered
+     * @param string     $secretKey A valid IFTTT secret key
+     * @param string|int $level     The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble    Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct($eventName, $secretKey, $level = Logger::ERROR, bool $bubble = true)
+    public function __construct(string $eventName, string $secretKey, $level = Logger::ERROR, bool $bubble = true)
     {
         $this->eventName = $eventName;
         $this->secretKey = $secretKey;
diff --git a/src/Monolog/Handler/InsightOpsHandler.php b/src/Monolog/Handler/InsightOpsHandler.php
index e211cc75..1f6d41fc 100644
--- a/src/Monolog/Handler/InsightOpsHandler.php
+++ b/src/Monolog/Handler/InsightOpsHandler.php
@@ -27,15 +27,15 @@ class InsightOpsHandler extends SocketHandler
     protected $logToken;
 
     /**
-     * @param string $token  Log token supplied by InsightOps
-     * @param string $region Region where InsightOps account is hosted. Could be 'us' or 'eu'.
-     * @param bool   $useSSL Whether or not SSL encryption should be used
-     * @param int    $level  The minimum logging level to trigger this handler
-     * @param bool   $bubble Whether or not messages that are handled should bubble up the stack.
+     * @param string     $token  Log token supplied by InsightOps
+     * @param string     $region Region where InsightOps account is hosted. Could be 'us' or 'eu'.
+     * @param bool       $useSSL Whether or not SSL encryption should be used
+     * @param string|int $level  The minimum logging level to trigger this handler
+     * @param bool       $bubble Whether or not messages that are handled should bubble up the stack.
      *
      * @throws MissingExtensionException If SSL encryption is set to true and OpenSSL is missing
      */
-    public function __construct($token, $region = 'us', $useSSL = true, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct(string $token, string $region = 'us', bool $useSSL = true, $level = Logger::DEBUG, bool $bubble = true)
     {
         if ($useSSL && !extension_loaded('openssl')) {
             throw new MissingExtensionException('The OpenSSL PHP plugin is required to use SSL encrypted connection for LogEntriesHandler');
@@ -51,11 +51,8 @@ class InsightOpsHandler extends SocketHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param  array  $record
-     * @return string
      */
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         return $this->logToken . ' ' . $record['formatted'];
     }
diff --git a/src/Monolog/Handler/LogEntriesHandler.php b/src/Monolog/Handler/LogEntriesHandler.php
index 3af5b241..66de5f80 100644
--- a/src/Monolog/Handler/LogEntriesHandler.php
+++ b/src/Monolog/Handler/LogEntriesHandler.php
@@ -24,14 +24,15 @@ class LogEntriesHandler extends SocketHandler
     protected $logToken;
 
     /**
-     * @param string $token  Log token supplied by LogEntries
-     * @param bool   $useSSL Whether or not SSL encryption should be used.
-     * @param int    $level  The minimum logging level to trigger this handler
-     * @param bool   $bubble Whether or not messages that are handled should bubble up the stack.
+     * @param string     $token  Log token supplied by LogEntries
+     * @param bool       $useSSL Whether or not SSL encryption should be used.
+     * @param string|int $level  The minimum logging level to trigger this handler
+     * @param bool       $bubble Whether or not messages that are handled should bubble up the stack.
+     * @param string     $host   Custom hostname to send the data to if needed
      *
      * @throws MissingExtensionException If SSL encryption is set to true and OpenSSL is missing
      */
-    public function __construct($token, $useSSL = true, $level = Logger::DEBUG, bool $bubble = true, string $host = 'data.logentries.com')
+    public function __construct(string $token, bool $useSSL = true, $level = Logger::DEBUG, bool $bubble = true, string $host = 'data.logentries.com')
     {
         if ($useSSL && !extension_loaded('openssl')) {
             throw new MissingExtensionException('The OpenSSL PHP plugin is required to use SSL encrypted connection for LogEntriesHandler');
@@ -44,11 +45,8 @@ class LogEntriesHandler extends SocketHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param  array  $record
-     * @return string
      */
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         return $this->logToken . ' ' . $record['formatted'];
     }
diff --git a/src/Monolog/Handler/LogglyHandler.php b/src/Monolog/Handler/LogglyHandler.php
index 647c7e13..abec20b8 100644
--- a/src/Monolog/Handler/LogglyHandler.php
+++ b/src/Monolog/Handler/LogglyHandler.php
@@ -32,10 +32,17 @@ class LogglyHandler extends AbstractProcessingHandler
 
     protected $tag = [];
 
-    public function __construct($token, $level = Logger::DEBUG, bool $bubble = true)
+    /**
+     * @param string     $token  API token supplied by Loggly
+     * @param string|int $level  The minimum logging level to trigger this handler
+     * @param bool       $bubble Whether or not messages that are handled should bubble up the stack.
+     *
+     * @throws MissingExtensionException If the curl extension is missing
+     */
+    public function __construct(string $token, $level = Logger::DEBUG, bool $bubble = true)
     {
         if (!extension_loaded('curl')) {
-            throw new \LogicException('The curl extension is needed to use the LogglyHandler');
+            throw new MissingExtensionException('The curl extension is needed to use the LogglyHandler');
         }
 
         $this->token = $token;
@@ -43,18 +50,28 @@ class LogglyHandler extends AbstractProcessingHandler
         parent::__construct($level, $bubble);
     }
 
-    public function setTag($tag)
+    /**
+     * @param string[]|string $tag
+     */
+    public function setTag($tag): self
     {
         $tag = !empty($tag) ? $tag : [];
         $this->tag = is_array($tag) ? $tag : [$tag];
+
+        return $this;
     }
 
-    public function addTag($tag)
+    /**
+     * @param string[]|string $tag
+     */
+    public function addTag($tag): self
     {
         if (!empty($tag)) {
             $tag = is_array($tag) ? $tag : [$tag];
             $this->tag = array_unique(array_merge($this->tag, $tag));
         }
+
+        return $this;
     }
 
     protected function write(array $record): void
@@ -75,7 +92,7 @@ class LogglyHandler extends AbstractProcessingHandler
         }
     }
 
-    protected function send($data, $endpoint)
+    protected function send(string $data, string $endpoint): void
     {
         $url = sprintf("https://%s/%s/%s/", self::HOST, $endpoint, $this->token);
 
diff --git a/src/Monolog/Handler/LogmaticHandler.php b/src/Monolog/Handler/LogmaticHandler.php
index 97472204..209af161 100644
--- a/src/Monolog/Handler/LogmaticHandler.php
+++ b/src/Monolog/Handler/LogmaticHandler.php
@@ -64,7 +64,7 @@ class LogmaticHandler extends SocketHandler
     /**
      * {@inheritdoc}
      */
-    protected function generateDataStream($record): string
+    protected function generateDataStream(array $record): string
     {
         return $this->logToken . ' ' . $record['formatted'];
     }
diff --git a/src/Monolog/Handler/MandrillHandler.php b/src/Monolog/Handler/MandrillHandler.php
index f84aa8cc..46b8bff0 100644
--- a/src/Monolog/Handler/MandrillHandler.php
+++ b/src/Monolog/Handler/MandrillHandler.php
@@ -27,10 +27,10 @@ class MandrillHandler extends MailHandler
     /**
      * @param string                  $apiKey  A valid Mandrill API key
      * @param callable|\Swift_Message $message An example message for real messages, only the body will be replaced
-     * @param int                     $level   The minimum logging level at which this handler will be triggered
+     * @param string|int              $level   The minimum logging level at which this handler will be triggered
      * @param bool                    $bubble  Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct($apiKey, $message, $level = Logger::ERROR, bool $bubble = true)
+    public function __construct(string $apiKey, $message, $level = Logger::ERROR, bool $bubble = true)
     {
         parent::__construct($level, $bubble);
 
diff --git a/src/Monolog/Handler/MissingExtensionException.php b/src/Monolog/Handler/MissingExtensionException.php
index 1554b345..3965aeea 100644
--- a/src/Monolog/Handler/MissingExtensionException.php
+++ b/src/Monolog/Handler/MissingExtensionException.php
@@ -12,9 +12,9 @@
 namespace Monolog\Handler;
 
 /**
- * Exception can be thrown if an extension for an handler is missing
+ * Exception can be thrown if an extension for a handler is missing
  *
- * @author  Christian Bergau <cbergau86@gmail.com>
+ * @author Christian Bergau <cbergau86@gmail.com>
  */
 class MissingExtensionException extends \Exception
 {
diff --git a/src/Monolog/Handler/MongoDBHandler.php b/src/Monolog/Handler/MongoDBHandler.php
index 98a23822..e7539174 100644
--- a/src/Monolog/Handler/MongoDBHandler.php
+++ b/src/Monolog/Handler/MongoDBHandler.php
@@ -43,10 +43,10 @@ class MongoDBHandler extends AbstractProcessingHandler
      * @param Client|Manager $mongodb    MongoDB library or driver client
      * @param string         $database   Database name
      * @param string         $collection Collection name
-     * @param int            $level      The minimum logging level at which this handler will be triggered
+     * @param string|int     $level      The minimum logging level at which this handler will be triggered
      * @param bool           $bubble     Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct($mongodb, $database, $collection, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct($mongodb, string $database, string $collection, $level = Logger::DEBUG, bool $bubble = true)
     {
         if (!($mongodb instanceof Client || $mongodb instanceof Manager)) {
             throw new \InvalidArgumentException('MongoDB\Client or MongoDB\Driver\Manager instance required');
diff --git a/src/Monolog/Handler/NativeMailerHandler.php b/src/Monolog/Handler/NativeMailerHandler.php
index b6f8dbbb..cd205611 100644
--- a/src/Monolog/Handler/NativeMailerHandler.php
+++ b/src/Monolog/Handler/NativeMailerHandler.php
@@ -54,7 +54,7 @@ class NativeMailerHandler extends MailHandler
 
     /**
      * The Content-type for the message
-     * @var string
+     * @var string|null
      */
     protected $contentType;
 
@@ -68,11 +68,11 @@ class NativeMailerHandler extends MailHandler
      * @param string|array $to             The receiver of the mail
      * @param string       $subject        The subject of the mail
      * @param string       $from           The sender of the mail
-     * @param int          $level          The minimum logging level at which this handler will be triggered
+     * @param string|int   $level          The minimum logging level at which this handler will be triggered
      * @param bool         $bubble         Whether the messages that are handled can bubble up the stack or not
      * @param int          $maxColumnWidth The maximum column width that the message lines will have
      */
-    public function __construct($to, $subject, $from, $level = Logger::ERROR, bool $bubble = true, $maxColumnWidth = 70)
+    public function __construct($to, string $subject, string $from, $level = Logger::ERROR, bool $bubble = true, int $maxColumnWidth = 70)
     {
         parent::__construct($level, $bubble);
         $this->to = (array) $to;
@@ -84,10 +84,9 @@ class NativeMailerHandler extends MailHandler
     /**
      * Add headers to the message
      *
-     * @param  string|array $headers Custom added headers
-     * @return self
+     * @param string|array $headers Custom added headers
      */
-    public function addHeader($headers)
+    public function addHeader($headers): self
     {
         foreach ((array) $headers as $header) {
             if (strpos($header, "\n") !== false || strpos($header, "\r") !== false) {
@@ -102,10 +101,9 @@ class NativeMailerHandler extends MailHandler
     /**
      * Add parameters to the message
      *
-     * @param  string|array $parameters Custom added parameters
-     * @return self
+     * @param string|array $parameters Custom added parameters
      */
-    public function addParameter($parameters)
+    public function addParameter($parameters): self
     {
         $this->parameters = array_merge($this->parameters, (array) $parameters);
 
@@ -141,28 +139,20 @@ class NativeMailerHandler extends MailHandler
         }
     }
 
-    /**
-     * @return string $contentType
-     */
-    public function getContentType()
+    public function getContentType(): ?string
     {
         return $this->contentType;
     }
 
-    /**
-     * @return string $encoding
-     */
-    public function getEncoding()
+    public function getEncoding(): string
     {
         return $this->encoding;
     }
 
     /**
-     * @param  string $contentType The content type of the email - Defaults to text/plain. Use text/html for HTML
-     *                             messages.
-     * @return self
+     * @param string $contentType The content type of the email - Defaults to text/plain. Use text/html for HTML messages.
      */
-    public function setContentType($contentType)
+    public function setContentType(string $contentType): self
     {
         if (strpos($contentType, "\n") !== false || strpos($contentType, "\r") !== false) {
             throw new \InvalidArgumentException('The content type can not contain newline characters to prevent email header injection');
@@ -173,11 +163,7 @@ class NativeMailerHandler extends MailHandler
         return $this;
     }
 
-    /**
-     * @param  string $encoding
-     * @return self
-     */
-    public function setEncoding($encoding)
+    public function setEncoding(string $encoding): self
     {
         if (strpos($encoding, "\n") !== false || strpos($encoding, "\r") !== false) {
             throw new \InvalidArgumentException('The encoding can not contain newline characters to prevent email header injection');
diff --git a/src/Monolog/Handler/NewRelicHandler.php b/src/Monolog/Handler/NewRelicHandler.php
index c4540b69..6d7eb9bb 100644
--- a/src/Monolog/Handler/NewRelicHandler.php
+++ b/src/Monolog/Handler/NewRelicHandler.php
@@ -29,14 +29,14 @@ class NewRelicHandler extends AbstractProcessingHandler
     /**
      * Name of the New Relic application that will receive logs from this handler.
      *
-     * @var string
+     * @var string|null
      */
     protected $appName;
 
     /**
      * Name of the current transaction
      *
-     * @var string
+     * @var string|null
      */
     protected $transactionName;
 
@@ -51,16 +51,18 @@ class NewRelicHandler extends AbstractProcessingHandler
     /**
      * {@inheritDoc}
      *
-     * @param string $appName
-     * @param bool   $explodeArrays
-     * @param string $transactionName
+     * @param string|int  $level           The minimum logging level at which this handler will be triggered.
+     * @param bool        $bubble          Whether the messages that are handled can bubble up the stack or not.
+     * @param string|null $appName
+     * @param bool        $explodeArrays
+     * @param string|null $transactionName
      */
     public function __construct(
         $level = Logger::ERROR,
-        $bubble = true,
-        $appName = null,
-        $explodeArrays = false,
-        $transactionName = null
+        bool $bubble = true,
+        ?string $appName = null,
+        bool $explodeArrays = false,
+        ?string $transactionName = null
     ) {
         parent::__construct($level, $bubble);
 
@@ -124,7 +126,7 @@ class NewRelicHandler extends AbstractProcessingHandler
      *
      * @return bool
      */
-    protected function isNewRelicEnabled()
+    protected function isNewRelicEnabled(): bool
     {
         return extension_loaded('newrelic');
     }
@@ -132,11 +134,8 @@ class NewRelicHandler extends AbstractProcessingHandler
     /**
      * Returns the appname where this log should be sent. Each log can override the default appname, set in this
      * handler's constructor, by providing the appname in it's context.
-     *
-     * @param  array       $context
-     * @return null|string
      */
-    protected function getAppName(array $context)
+    protected function getAppName(array $context): ?string
     {
         if (isset($context['appname'])) {
             return $context['appname'];
@@ -148,12 +147,8 @@ class NewRelicHandler extends AbstractProcessingHandler
     /**
      * Returns the name of the current transaction. Each log can override the default transaction name, set in this
      * handler's constructor, by providing the transaction_name in it's context
-     *
-     * @param array $context
-     *
-     * @return null|string
      */
-    protected function getTransactionName(array $context)
+    protected function getTransactionName(array $context): ?string
     {
         if (isset($context['transaction_name'])) {
             return $context['transaction_name'];
@@ -164,20 +159,16 @@ class NewRelicHandler extends AbstractProcessingHandler
 
     /**
      * Sets the NewRelic application that should receive this log.
-     *
-     * @param string $appName
      */
-    protected function setNewRelicAppName($appName)
+    protected function setNewRelicAppName(string $appName): void
     {
         newrelic_set_appname($appName);
     }
 
     /**
      * Overwrites the name of the current transaction
-     *
-     * @param string $transactionName
      */
-    protected function setNewRelicTransactionName($transactionName)
+    protected function setNewRelicTransactionName(string $transactionName): void
     {
         newrelic_name_transaction($transactionName);
     }
@@ -186,7 +177,7 @@ class NewRelicHandler extends AbstractProcessingHandler
      * @param string $key
      * @param mixed  $value
      */
-    protected function setNewRelicParameter($key, $value)
+    protected function setNewRelicParameter(string $key, $value): void
     {
         if (null === $value || is_scalar($value)) {
             newrelic_add_custom_parameter($key, $value);
diff --git a/src/Monolog/Handler/NullHandler.php b/src/Monolog/Handler/NullHandler.php
index 93678e8f..bb81f8d2 100644
--- a/src/Monolog/Handler/NullHandler.php
+++ b/src/Monolog/Handler/NullHandler.php
@@ -23,14 +23,17 @@ use Monolog\Logger;
  */
 class NullHandler extends Handler
 {
+    /**
+     * @var int
+     */
     private $level;
 
     /**
-     * @param int $level The minimum logging level at which this handler will be triggered
+     * @param string|int $level The minimum logging level at which this handler will be triggered
      */
-    public function __construct(int $level = Logger::DEBUG)
+    public function __construct($level = Logger::DEBUG)
     {
-        $this->level = $level;
+        $this->level = Logger::toMonologLevel($level);
     }
 
     /**
diff --git a/src/Monolog/Handler/PHPConsoleHandler.php b/src/Monolog/Handler/PHPConsoleHandler.php
index f40e3d5f..356e0748 100644
--- a/src/Monolog/Handler/PHPConsoleHandler.php
+++ b/src/Monolog/Handler/PHPConsoleHandler.php
@@ -68,8 +68,8 @@ class PHPConsoleHandler extends AbstractProcessingHandler
     /**
      * @param  array             $options   See \Monolog\Handler\PHPConsoleHandler::$options for more details
      * @param  Connector|null    $connector Instance of \PhpConsole\Connector class (optional)
-     * @param  int|string        $level
-     * @param  bool              $bubble
+     * @param  string|int        $level     The minimum logging level at which this handler will be triggered.
+     * @param  bool              $bubble    Whether the messages that are handled can bubble up the stack or not.
      * @throws \RuntimeException
      */
     public function __construct(array $options = [], ?Connector $connector = null, $level = Logger::DEBUG, bool $bubble = true)
@@ -82,7 +82,7 @@ class PHPConsoleHandler extends AbstractProcessingHandler
         $this->connector = $this->initConnector($connector);
     }
 
-    private function initOptions(array $options)
+    private function initOptions(array $options): array
     {
         $wrongOptions = array_diff(array_keys($options), array_keys($this->options));
         if ($wrongOptions) {
@@ -95,7 +95,7 @@ class PHPConsoleHandler extends AbstractProcessingHandler
     /**
      * @suppress PhanTypeMismatchArgument
      */
-    private function initConnector(Connector $connector = null): Connector
+    private function initConnector(?Connector $connector = null): Connector
     {
         if (!$connector) {
             if ($this->options['dataStorage']) {
@@ -171,9 +171,6 @@ class PHPConsoleHandler extends AbstractProcessingHandler
 
     /**
      * Writes the record down to the log of the implementing handler
-     *
-     * @param  array $record
-     * @return void
      */
     protected function write(array $record): void
     {
diff --git a/src/Monolog/Handler/ProcessableHandlerInterface.php b/src/Monolog/Handler/ProcessableHandlerInterface.php
index 9556f985..27077c62 100644
--- a/src/Monolog/Handler/ProcessableHandlerInterface.php
+++ b/src/Monolog/Handler/ProcessableHandlerInterface.php
@@ -21,8 +21,8 @@ interface ProcessableHandlerInterface
     /**
      * Adds a processor in the stack.
      *
-     * @param  callable         $callback
-     * @return HandlerInterface self
+     * @param  ProcessorInterface|callable $callback
+     * @return HandlerInterface            self
      */
     public function pushProcessor(callable $callback): HandlerInterface;
 
diff --git a/src/Monolog/Handler/ProcessableHandlerTrait.php b/src/Monolog/Handler/ProcessableHandlerTrait.php
index ee5871b3..c4c38ec5 100644
--- a/src/Monolog/Handler/ProcessableHandlerTrait.php
+++ b/src/Monolog/Handler/ProcessableHandlerTrait.php
@@ -60,7 +60,7 @@ trait ProcessableHandlerTrait
         return $record;
     }
 
-    protected function resetProcessors()
+    protected function resetProcessors(): void
     {
         foreach ($this->processors as $processor) {
             if ($processor instanceof ResettableInterface) {
diff --git a/src/Monolog/Handler/PsrHandler.php b/src/Monolog/Handler/PsrHandler.php
index b59e99af..a9780b01 100644
--- a/src/Monolog/Handler/PsrHandler.php
+++ b/src/Monolog/Handler/PsrHandler.php
@@ -30,7 +30,7 @@ class PsrHandler extends AbstractHandler
 
     /**
      * @param LoggerInterface $logger The underlying PSR-3 compliant logger to which messages will be proxied
-     * @param int             $level  The minimum logging level at which this handler will be triggered
+     * @param string|int      $level  The minimum logging level at which this handler will be triggered
      * @param bool            $bubble Whether the messages that are handled can bubble up the stack or not
      */
     public function __construct(LoggerInterface $logger, $level = Logger::DEBUG, bool $bubble = true)
diff --git a/src/Monolog/Handler/PushoverHandler.php b/src/Monolog/Handler/PushoverHandler.php
index c6cba6e8..3d07e41f 100644
--- a/src/Monolog/Handler/PushoverHandler.php
+++ b/src/Monolog/Handler/PushoverHandler.php
@@ -68,19 +68,31 @@ class PushoverHandler extends SocketHandler
      * @param string       $token             Pushover api token
      * @param string|array $users             Pushover user id or array of ids the message will be sent to
      * @param string       $title             Title sent to the Pushover API
-     * @param int          $level             The minimum logging level at which this handler will be triggered
+     * @param string|int   $level             The minimum logging level at which this handler will be triggered
      * @param bool         $bubble            Whether the messages that are handled can bubble up the stack or not
      * @param bool         $useSSL            Whether to connect via SSL. Required when pushing messages to users that are not
      *                                        the pushover.net app owner. OpenSSL is required for this option.
-     * @param int          $highPriorityLevel The minimum logging level at which this handler will start
+     * @param string|int   $highPriorityLevel The minimum logging level at which this handler will start
      *                                        sending "high priority" requests to the Pushover API
-     * @param int          $emergencyLevel    The minimum logging level at which this handler will start
+     * @param string|int   $emergencyLevel    The minimum logging level at which this handler will start
      *                                        sending "emergency" requests to the Pushover API
-     * @param int          $retry             The retry parameter specifies how often (in seconds) the Pushover servers will send the same notification to the user.
-     * @param int          $expire            The expire parameter specifies how many seconds your notification will continue to be retried for (every retry seconds).
+     * @param int          $retry             The retry parameter specifies how often (in seconds) the Pushover servers will
+     *                                        send the same notification to the user.
+     * @param int          $expire            The expire parameter specifies how many seconds your notification will continue
+     *                                        to be retried for (every retry seconds).
      */
-    public function __construct($token, $users, $title = null, $level = Logger::CRITICAL, bool $bubble = true, $useSSL = true, $highPriorityLevel = Logger::CRITICAL, $emergencyLevel = Logger::EMERGENCY, $retry = 30, $expire = 25200)
-    {
+    public function __construct(
+        string $token,
+        $users,
+        ?string $title = null,
+        $level = Logger::CRITICAL,
+        bool $bubble = true,
+        bool $useSSL = true,
+        $highPriorityLevel = Logger::CRITICAL,
+        $emergencyLevel = Logger::EMERGENCY,
+        int $retry = 30,
+        int $expire = 25200
+    ) {
         $connectionString = $useSSL ? 'ssl://api.pushover.net:443' : 'api.pushover.net:80';
         parent::__construct($connectionString, $level, $bubble);
 
@@ -93,14 +105,14 @@ class PushoverHandler extends SocketHandler
         $this->expire = $expire;
     }
 
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         $content = $this->buildContent($record);
 
         return $this->buildHeader($content) . $content;
     }
 
-    private function buildContent($record)
+    private function buildContent(array $record): string
     {
         // Pushover has a limit of 512 characters on title and message combined.
         $maxMessageLength = 512 - strlen($this->title);
@@ -141,7 +153,7 @@ class PushoverHandler extends SocketHandler
         return http_build_query($dataArray);
     }
 
-    private function buildHeader($content)
+    private function buildHeader(string $content): string
     {
         $header = "POST /1/messages.json HTTP/1.1\r\n";
         $header .= "Host: api.pushover.net\r\n";
@@ -164,22 +176,27 @@ class PushoverHandler extends SocketHandler
         $this->user = null;
     }
 
-    public function setHighPriorityLevel($value)
+    public function setHighPriorityLevel($value): self
     {
-        $this->highPriorityLevel = $value;
+        $this->highPriorityLevel = Logger::toMonologLevel($value);
+
+        return $this;
     }
 
-    public function setEmergencyLevel($value)
+    public function setEmergencyLevel($value): self
     {
-        $this->emergencyLevel = $value;
+        $this->emergencyLevel = Logger::toMonologLevel($value);
+
+        return $this;
     }
 
     /**
      * Use the formatted message?
-     * @param bool $value
      */
-    public function useFormattedMessage($value)
+    public function useFormattedMessage(bool $value): self
     {
-        $this->useFormattedMessage = (bool) $value;
+        $this->useFormattedMessage = $value;
+
+        return $this;
     }
 }
diff --git a/src/Monolog/Handler/RavenHandler.php b/src/Monolog/Handler/RavenHandler.php
index 204a540e..6836c488 100644
--- a/src/Monolog/Handler/RavenHandler.php
+++ b/src/Monolog/Handler/RavenHandler.php
@@ -114,9 +114,11 @@ class RavenHandler extends AbstractProcessingHandler
      *
      * @param FormatterInterface $formatter
      */
-    public function setBatchFormatter(FormatterInterface $formatter): void
+    public function setBatchFormatter(FormatterInterface $formatter): self
     {
         $this->batchFormatter = $formatter;
+
+        return $this;
     }
 
     /**
@@ -250,13 +252,17 @@ class RavenHandler extends AbstractProcessingHandler
     /**
      * @link https://docs.sentry.io/learn/breadcrumbs/
      */
-    public function addBreadcrumb(array $crumb): void
+    public function addBreadcrumb(array $crumb): self
     {
         $this->ravenClient->breadcrumbs->record($crumb);
+
+        return $this;
     }
 
-    public function resetBreadcrumbs(): void
+    public function resetBreadcrumbs(): self
     {
         $this->ravenClient->breadcrumbs->reset();
+
+        return $this;
     }
 }
diff --git a/src/Monolog/Handler/RedisHandler.php b/src/Monolog/Handler/RedisHandler.php
index ede8be31..3894513d 100644
--- a/src/Monolog/Handler/RedisHandler.php
+++ b/src/Monolog/Handler/RedisHandler.php
@@ -35,7 +35,7 @@ class RedisHandler extends AbstractProcessingHandler
     /**
      * @param \Predis\Client|\Redis $redis   The redis instance
      * @param string                $key     The key name to push records to
-     * @param int                   $level   The minimum logging level at which this handler will be triggered
+     * @param string|int            $level   The minimum logging level at which this handler will be triggered
      * @param bool                  $bubble  Whether the messages that are handled can bubble up the stack or not
      * @param int                   $capSize Number of entries to limit list size to, 0 = unlimited
      */
@@ -67,11 +67,8 @@ class RedisHandler extends AbstractProcessingHandler
     /**
      * Write and cap the collection
      * Writes the record to the redis list and caps its
-     *
-     * @param  array $record associative record array
-     * @return void
      */
-    protected function writeCapped(array $record)
+    protected function writeCapped(array $record): void
     {
         if ($this->redisClient instanceof \Redis) {
             $this->redisClient->multi()
diff --git a/src/Monolog/Handler/RollbarHandler.php b/src/Monolog/Handler/RollbarHandler.php
index f23ac2ee..979d651e 100644
--- a/src/Monolog/Handler/RollbarHandler.php
+++ b/src/Monolog/Handler/RollbarHandler.php
@@ -60,7 +60,7 @@ class RollbarHandler extends AbstractProcessingHandler
 
     /**
      * @param RollbarLogger $rollbarLogger RollbarLogger object constructed with valid token
-     * @param int           $level         The minimum logging level at which this handler will be triggered
+     * @param string|int    $level         The minimum logging level at which this handler will be triggered
      * @param bool          $bubble        Whether the messages that are handled can bubble up the stack or not
      */
     public function __construct(RollbarLogger $rollbarLogger, $level = Logger::ERROR, bool $bubble = true)
diff --git a/src/Monolog/Handler/RotatingFileHandler.php b/src/Monolog/Handler/RotatingFileHandler.php
index 58f6ac11..f5446087 100644
--- a/src/Monolog/Handler/RotatingFileHandler.php
+++ b/src/Monolog/Handler/RotatingFileHandler.php
@@ -37,14 +37,14 @@ class RotatingFileHandler extends StreamHandler
     protected $dateFormat;
 
     /**
-     * @param string   $filename
-     * @param int      $maxFiles       The maximal amount of files to keep (0 means unlimited)
-     * @param int      $level          The minimum logging level at which this handler will be triggered
-     * @param bool     $bubble         Whether the messages that are handled can bubble up the stack or not
-     * @param int|null $filePermission Optional file permissions (default (0644) are only for owner read/write)
-     * @param bool     $useLocking     Try to lock log file before doing any writes
+     * @param string     $filename
+     * @param int        $maxFiles       The maximal amount of files to keep (0 means unlimited)
+     * @param string|int $level          The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble         Whether the messages that are handled can bubble up the stack or not
+     * @param int|null   $filePermission Optional file permissions (default (0644) are only for owner read/write)
+     * @param bool       $useLocking     Try to lock log file before doing any writes
      */
-    public function __construct($filename, $maxFiles = 0, $level = Logger::DEBUG, bool $bubble = true, $filePermission = null, $useLocking = false)
+    public function __construct(string $filename, int $maxFiles = 0, $level = Logger::DEBUG, bool $bubble = true, ?int $filePermission = null, bool $useLocking = false)
     {
         $this->filename = $filename;
         $this->maxFiles = (int) $maxFiles;
@@ -79,7 +79,7 @@ class RotatingFileHandler extends StreamHandler
         }
     }
 
-    public function setFilenameFormat($filenameFormat, $dateFormat)
+    public function setFilenameFormat(string $filenameFormat, string $dateFormat): self
     {
         if (!preg_match('{^Y(([/_.-]?m)([/_.-]?d)?)?$}', $dateFormat)) {
             throw new InvalidArgumentException(
@@ -98,6 +98,8 @@ class RotatingFileHandler extends StreamHandler
         $this->dateFormat = $dateFormat;
         $this->url = $this->getTimedFilename();
         $this->close();
+
+        return $this;
     }
 
     /**
@@ -158,7 +160,7 @@ class RotatingFileHandler extends StreamHandler
         $this->mustRotate = false;
     }
 
-    protected function getTimedFilename()
+    protected function getTimedFilename(): string
     {
         $fileInfo = pathinfo($this->filename);
         $timedFilename = str_replace(
@@ -174,7 +176,7 @@ class RotatingFileHandler extends StreamHandler
         return $timedFilename;
     }
 
-    protected function getGlobPattern()
+    protected function getGlobPattern(): string
     {
         $fileInfo = pathinfo($this->filename);
         $glob = str_replace(
diff --git a/src/Monolog/Handler/SamplingHandler.php b/src/Monolog/Handler/SamplingHandler.php
index 8a25cbb7..814c9048 100644
--- a/src/Monolog/Handler/SamplingHandler.php
+++ b/src/Monolog/Handler/SamplingHandler.php
@@ -41,9 +41,9 @@ class SamplingHandler extends AbstractHandler implements ProcessableHandlerInter
 
     /**
      * @param callable|HandlerInterface $handler Handler or factory callable($record, $fingersCrossedHandler).
-     * @param int                       $factor  Sample factor
+     * @param int                       $factor  Sample factor (e.g. 10 means every ~10th record is sampled)
      */
-    public function __construct($handler, $factor)
+    public function __construct($handler, int $factor)
     {
         parent::__construct();
         $this->handler = $handler;
diff --git a/src/Monolog/Handler/SlackHandler.php b/src/Monolog/Handler/SlackHandler.php
index 30a10fc1..553db40f 100644
--- a/src/Monolog/Handler/SlackHandler.php
+++ b/src/Monolog/Handler/SlackHandler.php
@@ -48,8 +48,18 @@ class SlackHandler extends SocketHandler
      * @param  array                     $excludeFields          Dot separated list of fields to exclude from slack message. E.g. ['context.field1', 'extra.field2']
      * @throws MissingExtensionException If no OpenSSL PHP extension configured
      */
-    public function __construct($token, $channel, $username = null, $useAttachment = true, $iconEmoji = null, $level = Logger::CRITICAL, bool $bubble = true, $useShortAttachment = false, $includeContextAndExtra = false, array $excludeFields = array())
-    {
+    public function __construct(
+        string $token,
+        string $channel,
+        ?string $username = null,
+        bool $useAttachment = true,
+        ?string $iconEmoji = null,
+        $level = Logger::CRITICAL,
+        bool $bubble = true,
+        bool $useShortAttachment = false,
+        bool $includeContextAndExtra = false,
+        array $excludeFields = array()
+    ) {
         if (!extension_loaded('openssl')) {
             throw new MissingExtensionException('The OpenSSL PHP extension is required to use the SlackHandler');
         }
@@ -69,23 +79,20 @@ class SlackHandler extends SocketHandler
         $this->token = $token;
     }
 
-    public function getSlackRecord()
+    public function getSlackRecord(): SlackRecord
     {
         return $this->slackRecord;
     }
 
-    public function getToken()
+    public function getToken(): string
     {
         return $this->token;
     }
 
     /**
      * {@inheritdoc}
-     *
-     * @param  array  $record
-     * @return string
      */
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         $content = $this->buildContent($record);
 
@@ -94,24 +101,15 @@ class SlackHandler extends SocketHandler
 
     /**
      * Builds the body of API call
-     *
-     * @param  array  $record
-     * @return string
      */
-    private function buildContent($record)
+    private function buildContent(array $record): string
     {
         $dataArray = $this->prepareContentData($record);
 
         return http_build_query($dataArray);
     }
 
-    /**
-     * Prepares content data
-     *
-     * @param  array $record
-     * @return array
-     */
-    protected function prepareContentData($record)
+    protected function prepareContentData(array $record): array
     {
         $dataArray = $this->slackRecord->getSlackData($record);
         $dataArray['token'] = $this->token;
@@ -125,11 +123,8 @@ class SlackHandler extends SocketHandler
 
     /**
      * Builds the header of the API Call
-     *
-     * @param  string $content
-     * @return string
      */
-    private function buildHeader($content)
+    private function buildHeader(string $content): string
     {
         $header = "POST /api/chat.postMessage HTTP/1.1\r\n";
         $header .= "Host: slack.com\r\n";
@@ -142,8 +137,6 @@ class SlackHandler extends SocketHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param array $record
      */
     protected function write(array $record): void
     {
@@ -157,7 +150,7 @@ class SlackHandler extends SocketHandler
      * If we do not read some but close the socket too early, slack sometimes
      * drops the request entirely.
      */
-    protected function finalizeWrite()
+    protected function finalizeWrite(): void
     {
         $res = $this->getResource();
         if (is_resource($res)) {
@@ -166,41 +159,6 @@ class SlackHandler extends SocketHandler
         $this->closeSocket();
     }
 
-    /**
-     * Returned a Slack message attachment color associated with
-     * provided level.
-     *
-     * @param  int    $level
-     * @return string
-     * @deprecated Use underlying SlackRecord instead
-     */
-    protected function getAttachmentColor($level)
-    {
-        trigger_error(
-            'SlackHandler::getAttachmentColor() is deprecated. Use underlying SlackRecord instead.',
-            E_USER_DEPRECATED
-        );
-
-        return $this->slackRecord->getAttachmentColor($level);
-    }
-
-    /**
-     * Stringifies an array of key/value pairs to be used in attachment fields
-     *
-     * @param  array  $fields
-     * @return string
-     * @deprecated Use underlying SlackRecord instead
-     */
-    protected function stringify($fields)
-    {
-        trigger_error(
-            'SlackHandler::stringify() is deprecated. Use underlying SlackRecord instead.',
-            E_USER_DEPRECATED
-        );
-
-        return $this->slackRecord->stringify($fields);
-    }
-
     public function setFormatter(FormatterInterface $formatter): HandlerInterface
     {
         parent::setFormatter($formatter);
diff --git a/src/Monolog/Handler/SlackWebhookHandler.php b/src/Monolog/Handler/SlackWebhookHandler.php
index 9c26486c..9b19a2e1 100644
--- a/src/Monolog/Handler/SlackWebhookHandler.php
+++ b/src/Monolog/Handler/SlackWebhookHandler.php
@@ -43,12 +43,22 @@ class SlackWebhookHandler extends AbstractProcessingHandler
      * @param string|null $iconEmoji              The emoji name to use (or null)
      * @param bool        $useShortAttachment     Whether the the context/extra messages added to Slack as attachments are in a short style
      * @param bool        $includeContextAndExtra Whether the attachment should include context and extra data
-     * @param int         $level                  The minimum logging level at which this handler will be triggered
+     * @param string|int  $level                  The minimum logging level at which this handler will be triggered
      * @param bool        $bubble                 Whether the messages that are handled can bubble up the stack or not
      * @param array       $excludeFields          Dot separated list of fields to exclude from slack message. E.g. ['context.field1', 'extra.field2']
      */
-    public function __construct($webhookUrl, $channel = null, $username = null, $useAttachment = true, $iconEmoji = null, $useShortAttachment = false, $includeContextAndExtra = false, $level = Logger::CRITICAL, bool $bubble = true, array $excludeFields = array())
-    {
+    public function __construct(
+        string $webhookUrl,
+        ?string $channel = null,
+        ?string $username = null,
+        bool $useAttachment = true,
+        ?string $iconEmoji = null,
+        bool $useShortAttachment = false,
+        bool $includeContextAndExtra = false,
+        $level = Logger::CRITICAL,
+        bool $bubble = true,
+        array $excludeFields = array()
+    ) {
         parent::__construct($level, $bubble);
 
         $this->webhookUrl = $webhookUrl;
@@ -64,12 +74,12 @@ class SlackWebhookHandler extends AbstractProcessingHandler
         );
     }
 
-    public function getSlackRecord()
+    public function getSlackRecord(): SlackRecord
     {
         return $this->slackRecord;
     }
 
-    public function getWebhookUrl()
+    public function getWebhookUrl(): string
     {
         return $this->webhookUrl;
     }
diff --git a/src/Monolog/Handler/SlackbotHandler.php b/src/Monolog/Handler/SlackbotHandler.php
index 3a1dfa5c..12f5d17b 100644
--- a/src/Monolog/Handler/SlackbotHandler.php
+++ b/src/Monolog/Handler/SlackbotHandler.php
@@ -40,13 +40,13 @@ class SlackbotHandler extends AbstractProcessingHandler
     private $channel;
 
     /**
-     * @param string $slackTeam Slack team slug
-     * @param string $token     Slackbot token
-     * @param string $channel   Slack channel (encoded ID or name)
-     * @param int    $level     The minimum logging level at which this handler will be triggered
-     * @param bool   $bubble    Whether the messages that are handled can bubble up the stack or not
+     * @param string     $slackTeam Slack team slug
+     * @param string     $token     Slackbot token
+     * @param string     $channel   Slack channel (encoded ID or name)
+     * @param string|int $level     The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble    Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct($slackTeam, $token, $channel, $level = Logger::CRITICAL, bool $bubble = true)
+    public function __construct(string $slackTeam, string $token, string $channel, $level = Logger::CRITICAL, bool $bubble = true)
     {
         parent::__construct($level, $bubble);
 
@@ -57,8 +57,6 @@ class SlackbotHandler extends AbstractProcessingHandler
 
     /**
      * {@inheritdoc}
-     *
-     * @param array $record
      */
     protected function write(array $record): void
     {
diff --git a/src/Monolog/Handler/SocketHandler.php b/src/Monolog/Handler/SocketHandler.php
index 3dc6d975..2861e67d 100644
--- a/src/Monolog/Handler/SocketHandler.php
+++ b/src/Monolog/Handler/SocketHandler.php
@@ -38,11 +38,11 @@ class SocketHandler extends AbstractProcessingHandler
     private $lastWritingAt;
 
     /**
-     * @param string $connectionString Socket connection string
-     * @param int    $level            The minimum logging level at which this handler will be triggered
-     * @param bool   $bubble           Whether the messages that are handled can bubble up the stack or not
+     * @param string     $connectionString Socket connection string
+     * @param int|string $level            The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble           Whether the messages that are handled can bubble up the stack or not
      */
-    public function __construct($connectionString, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct(string $connectionString, $level = Logger::DEBUG, bool $bubble = true)
     {
         parent::__construct($level, $bubble);
         $this->connectionString = $connectionString;
@@ -88,9 +88,11 @@ class SocketHandler extends AbstractProcessingHandler
     /**
      * Set socket connection to be persistent. It only has effect before the connection is initiated.
      */
-    public function setPersistent(bool $persistent): void
+    public function setPersistent(bool $persistent): self
     {
         $this->persistent = $persistent;
+
+        return $this;
     }
 
     /**
@@ -98,10 +100,12 @@ class SocketHandler extends AbstractProcessingHandler
      *
      * @see http://php.net/manual/en/function.fsockopen.php
      */
-    public function setConnectionTimeout(float $seconds): void
+    public function setConnectionTimeout(float $seconds): self
     {
         $this->validateTimeout($seconds);
-        $this->connectionTimeout = (float) $seconds;
+        $this->connectionTimeout = $seconds;
+
+        return $this;
     }
 
     /**
@@ -109,10 +113,12 @@ class SocketHandler extends AbstractProcessingHandler
      *
      * @see http://php.net/manual/en/function.stream-set-timeout.php
      */
-    public function setTimeout(float $seconds): void
+    public function setTimeout(float $seconds): self
     {
         $this->validateTimeout($seconds);
-        $this->timeout = (float) $seconds;
+        $this->timeout = $seconds;
+
+        return $this;
     }
 
     /**
@@ -120,18 +126,22 @@ class SocketHandler extends AbstractProcessingHandler
      *
      * @param float $seconds 0 for no timeout
      */
-    public function setWritingTimeout(float $seconds): void
+    public function setWritingTimeout(float $seconds): self
     {
         $this->validateTimeout($seconds);
-        $this->writingTimeout = (float) $seconds;
+        $this->writingTimeout = $seconds;
+
+        return $this;
     }
 
     /**
      * Set chunk size. Only has effect during connection in the writing cycle.
      */
-    public function setChunkSize(int $bytes): void
+    public function setChunkSize(int $bytes): self
     {
         $this->chunkSize = $bytes;
+
+        return $this;
     }
 
     /**
@@ -144,10 +154,8 @@ class SocketHandler extends AbstractProcessingHandler
 
     /**
      * Get persistent setting
-     *
-     * @return bool
      */
-    public function isPersistent()
+    public function isPersistent(): bool
     {
         return $this->persistent;
     }
@@ -268,7 +276,7 @@ class SocketHandler extends AbstractProcessingHandler
         $this->connect();
     }
 
-    protected function generateDataStream($record)
+    protected function generateDataStream(array $record): string
     {
         return (string) $record['formatted'];
     }
@@ -281,14 +289,14 @@ class SocketHandler extends AbstractProcessingHandler
         return $this->resource;
     }
 
-    private function connect()
+    private function connect(): void
     {
         $this->createSocketResource();
         $this->setSocketTimeout();
         $this->setStreamChunkSize();
     }
 
-    private function createSocketResource()
+    private function createSocketResource(): void
     {
         if ($this->isPersistent()) {
             $resource = $this->pfsockopen();
@@ -301,21 +309,21 @@ class SocketHandler extends AbstractProcessingHandler
         $this->resource = $resource;
     }
 
-    private function setSocketTimeout()
+    private function setSocketTimeout(): void
     {
         if (!$this->streamSetTimeout()) {
             throw new \UnexpectedValueException("Failed setting timeout with stream_set_timeout()");
         }
     }
 
-    private function setStreamChunkSize()
+    private function setStreamChunkSize(): void
     {
         if ($this->chunkSize && !$this->streamSetChunkSize()) {
             throw new \UnexpectedValueException("Failed setting chunk size with stream_set_chunk_size()");
         }
     }
 
-    private function writeToSocket($data)
+    private function writeToSocket(string $data): void
     {
         $length = strlen($data);
         $sent = 0;
@@ -344,7 +352,7 @@ class SocketHandler extends AbstractProcessingHandler
         }
     }
 
-    private function writingIsTimedOut($sent)
+    private function writingIsTimedOut(int $sent): bool
     {
         $writingTimeout = (int) floor($this->writingTimeout);
         if (0 === $writingTimeout) {
diff --git a/src/Monolog/Handler/SqsHandler.php b/src/Monolog/Handler/SqsHandler.php
index f282d023..07c2656e 100644
--- a/src/Monolog/Handler/SqsHandler.php
+++ b/src/Monolog/Handler/SqsHandler.php
@@ -31,7 +31,7 @@ class SqsHandler extends AbstractProcessingHandler
     /** @var string */
     private $queueUrl;
 
-    public function __construct(SqsClient $sqsClient, $queueUrl, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct(SqsClient $sqsClient, string $queueUrl, $level = Logger::DEBUG, bool $bubble = true)
     {
         parent::__construct($level, $bubble);
 
diff --git a/src/Monolog/Handler/StreamHandler.php b/src/Monolog/Handler/StreamHandler.php
index 92ccc04d..dad7a6dc 100644
--- a/src/Monolog/Handler/StreamHandler.php
+++ b/src/Monolog/Handler/StreamHandler.php
@@ -33,7 +33,7 @@ class StreamHandler extends AbstractProcessingHandler
 
     /**
      * @param resource|string $stream
-     * @param int             $level          The minimum logging level at which this handler will be triggered
+     * @param string|int      $level          The minimum logging level at which this handler will be triggered
      * @param bool            $bubble         Whether the messages that are handled can bubble up the stack or not
      * @param int|null        $filePermission Optional file permissions (default (0644) are only for owner read/write)
      * @param bool            $useLocking     Try to lock log file before doing any writes
@@ -41,7 +41,7 @@ class StreamHandler extends AbstractProcessingHandler
      * @throws \Exception                If a missing directory is not buildable
      * @throws \InvalidArgumentException If stream is not a resource or string
      */
-    public function __construct($stream, $level = Logger::DEBUG, bool $bubble = true, $filePermission = null, $useLocking = false)
+    public function __construct($stream, $level = Logger::DEBUG, bool $bubble = true, ?int $filePermission = null, bool $useLocking = false)
     {
         parent::__construct($level, $bubble);
         if (is_resource($stream)) {
@@ -82,7 +82,7 @@ class StreamHandler extends AbstractProcessingHandler
      *
      * @return string|null
      */
-    public function getUrl()
+    public function getUrl(): ?string
     {
         return $this->url;
     }
@@ -128,12 +128,12 @@ class StreamHandler extends AbstractProcessingHandler
      * @param resource $stream
      * @param array    $record
      */
-    protected function streamWrite($stream, array $record)
+    protected function streamWrite($stream, array $record): void
     {
         fwrite($stream, (string) $record['formatted']);
     }
 
-    private function customErrorHandler($code, $msg)
+    private function customErrorHandler($code, $msg): void
     {
         $this->errorMessage = preg_replace('{^(fopen|mkdir)\(.*?\): }', '', $msg);
     }
@@ -152,7 +152,7 @@ class StreamHandler extends AbstractProcessingHandler
         return null;
     }
 
-    private function createDir()
+    private function createDir(): void
     {
         // Do not try to create dir if it has already been tried.
         if ($this->dirCreated) {
diff --git a/src/Monolog/Handler/SwiftMailerHandler.php b/src/Monolog/Handler/SwiftMailerHandler.php
index 4fa14ca8..88279d11 100644
--- a/src/Monolog/Handler/SwiftMailerHandler.php
+++ b/src/Monolog/Handler/SwiftMailerHandler.php
@@ -30,7 +30,7 @@ class SwiftMailerHandler extends MailHandler
     /**
      * @param \Swift_Mailer          $mailer  The mailer to use
      * @param callable|Swift_Message $message An example message for real messages, only the body will be replaced
-     * @param int|string             $level   The minimum logging level at which this handler will be triggered
+     * @param string|int             $level   The minimum logging level at which this handler will be triggered
      * @param bool                   $bubble  Whether the messages that are handled can bubble up the stack or not
      */
     public function __construct(\Swift_Mailer $mailer, $message, $level = Logger::ERROR, bool $bubble = true)
diff --git a/src/Monolog/Handler/SyslogHandler.php b/src/Monolog/Handler/SyslogHandler.php
index fb7faef6..20594ced 100644
--- a/src/Monolog/Handler/SyslogHandler.php
+++ b/src/Monolog/Handler/SyslogHandler.php
@@ -32,13 +32,13 @@ class SyslogHandler extends AbstractSyslogHandler
     protected $logopts;
 
     /**
-     * @param string $ident
-     * @param mixed  $facility
-     * @param int    $level    The minimum logging level at which this handler will be triggered
-     * @param bool   $bubble   Whether the messages that are handled can bubble up the stack or not
-     * @param int    $logopts  Option flags for the openlog() call, defaults to LOG_PID
+     * @param string     $ident
+     * @param string|int $facility Either one of the names of the keys in $this->facilities, or a LOG_* facility constant
+     * @param string|int $level    The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble   Whether the messages that are handled can bubble up the stack or not
+     * @param int        $logopts  Option flags for the openlog() call, defaults to LOG_PID
      */
-    public function __construct($ident, $facility = LOG_USER, $level = Logger::DEBUG, bool $bubble = true, $logopts = LOG_PID)
+    public function __construct(string $ident, $facility = LOG_USER, $level = Logger::DEBUG, bool $bubble = true, int $logopts = LOG_PID)
     {
         parent::__construct($facility, $level, $bubble);
 
diff --git a/src/Monolog/Handler/SyslogUdpHandler.php b/src/Monolog/Handler/SyslogUdpHandler.php
index 103206bb..267d49e7 100644
--- a/src/Monolog/Handler/SyslogUdpHandler.php
+++ b/src/Monolog/Handler/SyslogUdpHandler.php
@@ -25,14 +25,14 @@ class SyslogUdpHandler extends AbstractSyslogHandler
     protected $ident;
 
     /**
-     * @param string $host
-     * @param int    $port
-     * @param mixed  $facility
-     * @param int    $level    The minimum logging level at which this handler will be triggered
-     * @param bool   $bubble   Whether the messages that are handled can bubble up the stack or not
-     * @param string $ident    Program name or tag for each log message.
+     * @param string     $host
+     * @param int        $port
+     * @param string|int $facility Either one of the names of the keys in $this->facilities, or a LOG_* facility constant
+     * @param string|int $level    The minimum logging level at which this handler will be triggered
+     * @param bool       $bubble   Whether the messages that are handled can bubble up the stack or not
+     * @param string     $ident    Program name or tag for each log message.
      */
-    public function __construct($host, $port = 514, $facility = LOG_USER, $level = Logger::DEBUG, bool $bubble = true, $ident = 'php')
+    public function __construct(string $host, int $port = 514, $facility = LOG_USER, $level = Logger::DEBUG, bool $bubble = true, string $ident = 'php')
     {
         parent::__construct($facility, $level, $bubble);
 
@@ -69,7 +69,7 @@ class SyslogUdpHandler extends AbstractSyslogHandler
     /**
      * Make common syslog header (see rfc5424)
      */
-    protected function makeCommonSyslogHeader($severity): string
+    protected function makeCommonSyslogHeader(int $severity): string
     {
         $priority = $severity + $this->facility;
 
@@ -88,7 +88,7 @@ class SyslogUdpHandler extends AbstractSyslogHandler
             $pid . " - - ";
     }
 
-    protected function getDateTime()
+    protected function getDateTime(): string
     {
         return date(\DateTime::RFC3339);
     }
@@ -96,8 +96,10 @@ class SyslogUdpHandler extends AbstractSyslogHandler
     /**
      * Inject your own socket, mainly used for testing
      */
-    public function setSocket(UdpSocket $socket)
+    public function setSocket(UdpSocket $socket): self
     {
         $this->socket = $socket;
+
+        return $this;
     }
 }
diff --git a/src/Monolog/Handler/TestHandler.php b/src/Monolog/Handler/TestHandler.php
index db9174e2..b12e2818 100644
--- a/src/Monolog/Handler/TestHandler.php
+++ b/src/Monolog/Handler/TestHandler.php
@@ -11,6 +11,8 @@
 
 namespace Monolog\Handler;
 
+use Monolog\Logger;
+
 /**
  * Used for testing purposes.
  *
@@ -79,16 +81,19 @@ class TestHandler extends AbstractProcessingHandler
         $this->recordsByLevel = [];
     }
 
-    public function hasRecords($level)
+    /**
+     * @param string|int $level Logging level value or name
+     */
+    public function hasRecords($level): bool
     {
-        return isset($this->recordsByLevel[$level]);
+        return isset($this->recordsByLevel[Logger::toMonologLevel($level)]);
     }
 
     /**
      * @param string|array $record Either a message string or an array containing message and optionally context keys that will be checked against all records
-     * @param int          $level  Logger::LEVEL constant value
+     * @param string|int   $level  Logging level value or name
      */
-    public function hasRecord($record, $level)
+    public function hasRecord($record, $level): bool
     {
         if (is_string($record)) {
             $record = array('message' => $record);
@@ -106,22 +111,33 @@ class TestHandler extends AbstractProcessingHandler
         }, $level);
     }
 
-    public function hasRecordThatContains($message, $level)
+    /**
+     * @param string|int $level Logging level value or name
+     */
+    public function hasRecordThatContains(string $message, $level): bool
     {
         return $this->hasRecordThatPasses(function ($rec) use ($message) {
             return strpos($rec['message'], $message) !== false;
         }, $level);
     }
 
-    public function hasRecordThatMatches($regex, $level)
+    /**
+     * @param string|int $level Logging level value or name
+     */
+    public function hasRecordThatMatches(string $regex, $level): bool
     {
         return $this->hasRecordThatPasses(function ($rec) use ($regex) {
             return preg_match($regex, $rec['message']) > 0;
         }, $level);
     }
 
+    /**
+     * @param string|int $level Logging level value or name
+     */
     public function hasRecordThatPasses(callable $predicate, $level)
     {
+        $level = Logger::toMonologLevel($level);
+
         if (!isset($this->recordsByLevel[$level])) {
             return false;
         }
diff --git a/src/Monolog/Handler/ZendMonitorHandler.php b/src/Monolog/Handler/ZendMonitorHandler.php
index 95eca6d5..0ced7079 100644
--- a/src/Monolog/Handler/ZendMonitorHandler.php
+++ b/src/Monolog/Handler/ZendMonitorHandler.php
@@ -39,10 +39,8 @@ class ZendMonitorHandler extends AbstractProcessingHandler
     ];
 
     /**
-     * Construct
-     *
-     * @param  int                       $level
-     * @param  bool                      $bubble
+     * @param  string|int                $level   The minimum logging level at which this handler will be triggered.
+     * @param  bool                      $bubble  Whether the messages that are handled can bubble up the stack or not.
      * @throws MissingExtensionException
      */
     public function __construct($level = Logger::DEBUG, bool $bubble = true)
@@ -65,7 +63,7 @@ class ZendMonitorHandler extends AbstractProcessingHandler
         );
     }
 
-    protected function writeZendMonitorCustomEvent(int $level, string $message, array $formatted)
+    protected function writeZendMonitorCustomEvent(int $level, string $message, array $formatted): void
     {
         zend_monitor_custom_event($level, $message, $formatted);
     }
diff --git a/src/Monolog/Processor/HostnameProcessor.php b/src/Monolog/Processor/HostnameProcessor.php
index fef40849..7c23db8b 100644
--- a/src/Monolog/Processor/HostnameProcessor.php
+++ b/src/Monolog/Processor/HostnameProcessor.php
@@ -14,7 +14,7 @@ namespace Monolog\Processor;
 /**
  * Injects value of gethostname in all records
  */
-class HostnameProcessor
+class HostnameProcessor implements ProcessorInterface
 {
     private static $host;
 
diff --git a/src/Monolog/Processor/TagProcessor.php b/src/Monolog/Processor/TagProcessor.php
index 6c33e4fc..199760ad 100644
--- a/src/Monolog/Processor/TagProcessor.php
+++ b/src/Monolog/Processor/TagProcessor.php
@@ -25,14 +25,18 @@ class TagProcessor implements ProcessorInterface
         $this->setTags($tags);
     }
 
-    public function addTags(array $tags = [])
+    public function addTags(array $tags = []): self
     {
         $this->tags = array_merge($this->tags, $tags);
+
+        return $this;
     }
 
-    public function setTags(array $tags = [])
+    public function setTags(array $tags = []): self
     {
         $this->tags = $tags;
+
+        return $this;
     }
 
     public function __invoke(array $record): array
diff --git a/tests/Monolog/Handler/NewRelicHandlerTest.php b/tests/Monolog/Handler/NewRelicHandlerTest.php
index a71bbf88..26160094 100644
--- a/tests/Monolog/Handler/NewRelicHandlerTest.php
+++ b/tests/Monolog/Handler/NewRelicHandlerTest.php
@@ -163,7 +163,7 @@ class NewRelicHandlerTest extends TestCase
 
 class StubNewRelicHandlerWithoutExtension extends NewRelicHandler
 {
-    protected function isNewRelicEnabled()
+    protected function isNewRelicEnabled(): bool
     {
         return false;
     }
@@ -171,7 +171,7 @@ class StubNewRelicHandlerWithoutExtension extends NewRelicHandler
 
 class StubNewRelicHandler extends NewRelicHandler
 {
-    protected function isNewRelicEnabled()
+    protected function isNewRelicEnabled(): bool
     {
         return true;
     }
diff --git a/tests/Monolog/Handler/SyslogUdpHandlerTest.php b/tests/Monolog/Handler/SyslogUdpHandlerTest.php
index c35b3318..6656b17f 100644
--- a/tests/Monolog/Handler/SyslogUdpHandlerTest.php
+++ b/tests/Monolog/Handler/SyslogUdpHandlerTest.php
@@ -23,7 +23,7 @@ class SyslogUdpHandlerTest extends TestCase
      */
     public function testWeValidateFacilities()
     {
-        $handler = new SyslogUdpHandler("ip", null, "invalidFacility");
+        $handler = new SyslogUdpHandler("ip", 514, "invalidFacility");
     }
 
     public function testWeSplitIntoLines()