diff --git a/src/Monolog/Handler/LogEntriesHandler.php b/src/Monolog/Handler/LogEntriesHandler.php
index a2671b0f..3af5b241 100644
--- a/src/Monolog/Handler/LogEntriesHandler.php
+++ b/src/Monolog/Handler/LogEntriesHandler.php
@@ -31,13 +31,13 @@ class LogEntriesHandler extends SocketHandler
      *
      * @throws MissingExtensionException If SSL encryption is set to true and OpenSSL is missing
      */
-    public function __construct($token, $useSSL = true, $level = Logger::DEBUG, bool $bubble = true)
+    public function __construct($token, $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');
         }
 
-        $endpoint = $useSSL ? 'ssl://data.logentries.com:443' : 'data.logentries.com:80';
+        $endpoint = $useSSL ? 'ssl://' . $host . ':443' : $host . ':80';
         parent::__construct($endpoint, $level, $bubble);
         $this->logToken = $token;
     }
diff --git a/src/Monolog/Handler/RavenHandler.php b/src/Monolog/Handler/RavenHandler.php
index f6cf88a0..36f9bb82 100644
--- a/src/Monolog/Handler/RavenHandler.php
+++ b/src/Monolog/Handler/RavenHandler.php
@@ -27,7 +27,7 @@ class RavenHandler extends AbstractProcessingHandler
     /**
      * Translates Monolog log levels to Raven log levels.
      */
-    private $logLevels = [
+    protected $logLevels = [
         Logger::DEBUG     => Raven_Client::DEBUG,
         Logger::INFO      => Raven_Client::INFO,
         Logger::NOTICE    => Raven_Client::INFO,
@@ -41,13 +41,13 @@ class RavenHandler extends AbstractProcessingHandler
     /**
      * @var string the current application environment (staging|preprod|prod)
      */
-    private $environment;
+    protected $environment;
 
     /**
      * @var string should represent the current version of the calling
      *             software. Can be any string (git commit, version number)
      */
-    private $release;
+    protected $release;
 
     /**
      * @var Raven_Client the client object that sends the message to the server
@@ -226,7 +226,7 @@ class RavenHandler extends AbstractProcessingHandler
      */
     protected function getExtraParameters(): array
     {
-        return ['checksum', 'release', 'environment', 'event_id'];
+        return ['contexts', 'checksum', 'release', 'environment', 'event_id'];
     }
 
     /**
diff --git a/src/Monolog/Processor/GitProcessor.php b/src/Monolog/Processor/GitProcessor.php
index 9eec1862..b72944c7 100644
--- a/src/Monolog/Processor/GitProcessor.php
+++ b/src/Monolog/Processor/GitProcessor.php
@@ -19,7 +19,7 @@ use Monolog\Logger;
  * @author Nick Otter
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
-class GitProcessor
+class GitProcessor implements ProcessorInterface
 {
     private $level;
     private static $cache;
diff --git a/src/Monolog/Processor/IntrospectionProcessor.php b/src/Monolog/Processor/IntrospectionProcessor.php
index 5fe5b2aa..691d573c 100644
--- a/src/Monolog/Processor/IntrospectionProcessor.php
+++ b/src/Monolog/Processor/IntrospectionProcessor.php
@@ -24,7 +24,7 @@ use Monolog\Logger;
  *
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
-class IntrospectionProcessor
+class IntrospectionProcessor implements ProcessorInterface
 {
     private $level;
 
diff --git a/src/Monolog/Processor/MemoryProcessor.php b/src/Monolog/Processor/MemoryProcessor.php
index 5b06c2e9..227deb7c 100644
--- a/src/Monolog/Processor/MemoryProcessor.php
+++ b/src/Monolog/Processor/MemoryProcessor.php
@@ -16,7 +16,7 @@ namespace Monolog\Processor;
  *
  * @author Rob Jensen
  */
-abstract class MemoryProcessor
+abstract class MemoryProcessor implements ProcessorInterface
 {
     /**
      * @var bool If true, get the real size of memory allocated from system. Else, only the memory used by emalloc() is reported.
diff --git a/src/Monolog/Processor/MercurialProcessor.php b/src/Monolog/Processor/MercurialProcessor.php
index 6ab5bba9..b7fcd784 100644
--- a/src/Monolog/Processor/MercurialProcessor.php
+++ b/src/Monolog/Processor/MercurialProcessor.php
@@ -18,7 +18,7 @@ use Monolog\Logger;
  *
  * @author Jonathan A. Schweder <jonathanschweder@gmail.com>
  */
-class MercurialProcessor
+class MercurialProcessor implements ProcessorInterface
 {
     private $level;
     private static $cache;
diff --git a/src/Monolog/Processor/ProcessIdProcessor.php b/src/Monolog/Processor/ProcessIdProcessor.php
index 392bd131..7851fff6 100644
--- a/src/Monolog/Processor/ProcessIdProcessor.php
+++ b/src/Monolog/Processor/ProcessIdProcessor.php
@@ -16,7 +16,7 @@ namespace Monolog\Processor;
  *
  * @author Andreas Hörnicke
  */
-class ProcessIdProcessor
+class ProcessIdProcessor implements ProcessorInterface
 {
     public function __invoke(array $record): array
     {
diff --git a/src/Monolog/Processor/ProcessorInterface.php b/src/Monolog/Processor/ProcessorInterface.php
new file mode 100644
index 00000000..7e64d4df
--- /dev/null
+++ b/src/Monolog/Processor/ProcessorInterface.php
@@ -0,0 +1,25 @@
+<?php
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Processor;
+
+/**
+ * An optional interface to allow labelling Monolog processors.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+interface ProcessorInterface
+{
+    /**
+     * @return array The processed records
+     */
+    public function __invoke(array $records);
+}
diff --git a/src/Monolog/Processor/PsrLogMessageProcessor.php b/src/Monolog/Processor/PsrLogMessageProcessor.php
index ef8c4b2e..e923ea36 100644
--- a/src/Monolog/Processor/PsrLogMessageProcessor.php
+++ b/src/Monolog/Processor/PsrLogMessageProcessor.php
@@ -18,7 +18,7 @@ namespace Monolog\Processor;
  *
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
-class PsrLogMessageProcessor
+class PsrLogMessageProcessor implements ProcessorInterface
 {
     const SIMPLE_DATE = "Y-m-d\TH:i:s.uP";
 
diff --git a/src/Monolog/Processor/TagProcessor.php b/src/Monolog/Processor/TagProcessor.php
index 6371986f..6c33e4fc 100644
--- a/src/Monolog/Processor/TagProcessor.php
+++ b/src/Monolog/Processor/TagProcessor.php
@@ -16,7 +16,7 @@ namespace Monolog\Processor;
  *
  * @author Martijn Riemers
  */
-class TagProcessor
+class TagProcessor implements ProcessorInterface
 {
     private $tags;
 
diff --git a/src/Monolog/Processor/UidProcessor.php b/src/Monolog/Processor/UidProcessor.php
index 601171b3..19e11898 100644
--- a/src/Monolog/Processor/UidProcessor.php
+++ b/src/Monolog/Processor/UidProcessor.php
@@ -16,7 +16,7 @@ namespace Monolog\Processor;
  *
  * @author Simon Mönch <sm@webfactory.de>
  */
-class UidProcessor
+class UidProcessor implements ProcessorInterface
 {
     private $uid;
 
diff --git a/src/Monolog/Processor/WebProcessor.php b/src/Monolog/Processor/WebProcessor.php
index 37324af4..6b0a8d42 100644
--- a/src/Monolog/Processor/WebProcessor.php
+++ b/src/Monolog/Processor/WebProcessor.php
@@ -16,7 +16,7 @@ namespace Monolog\Processor;
  *
  * @author Jordi Boggiano <j.boggiano@seld.be>
  */
-class WebProcessor
+class WebProcessor implements ProcessorInterface
 {
     /**
      * @var array|\ArrayAccess