diff --git a/src/Monolog/Handler/LogEntriesHandler.php b/src/Monolog/Handler/LogEntriesHandler.php
index 494c605b..ea89fb3e 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, $bubble = true)
+    public function __construct($token, $useSSL = true, $level = Logger::DEBUG, $bubble = true, $host = 'data.logentries.com')
     {
         if ($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 34ff0091..10d7f43b 100644
--- a/src/Monolog/Handler/RavenHandler.php
+++ b/src/Monolog/Handler/RavenHandler.php
@@ -18,7 +18,7 @@ use Raven_Client;
 
 /**
  * Handler to send messages to a Sentry (https://github.com/getsentry/sentry) server
- * using raven-php (https://github.com/getsentry/raven-php)
+ * using sentry-php (https://github.com/getsentry/sentry-php)
  *
  * @author Marc Abramowitz <marc@marc-abramowitz.com>
  */
@@ -27,7 +27,7 @@ class RavenHandler extends AbstractProcessingHandler
     /**
      * Translates Monolog log levels to Raven log levels.
      */
-    private $logLevels = array(
+    protected $logLevels = array(
         Logger::DEBUG     => Raven_Client::DEBUG,
         Logger::INFO      => Raven_Client::INFO,
         Logger::NOTICE    => Raven_Client::INFO,
@@ -42,7 +42,7 @@ class RavenHandler extends AbstractProcessingHandler
      * @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
@@ -216,7 +216,7 @@ class RavenHandler extends AbstractProcessingHandler
      */
     protected function getExtraParameters()
     {
-        return array('checksum', 'release', 'event_id');
+        return array('contexts', 'checksum', 'release', 'event_id');
     }
 
     /**
diff --git a/src/Monolog/Processor/GitProcessor.php b/src/Monolog/Processor/GitProcessor.php
index 1899400d..9fc3f50f 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 2c07caed..6ae192a2 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 73f132d7..2a379a30 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 7c07a7e9..2f5b3265 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 9d3f5590..66b80fbb 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
 {
     /**
      * @param  array $record
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 c2686ce5..00a1c03b 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
 {
     /**
      * @param  array $record
diff --git a/src/Monolog/Processor/TagProcessor.php b/src/Monolog/Processor/TagProcessor.php
index 7e2df2ac..615a4d99 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 47f13f00..d1f708cf 100644
--- a/src/Monolog/Processor/UidProcessor.php
+++ b/src/Monolog/Processor/UidProcessor.php
@@ -18,7 +18,7 @@ use Monolog\ResettableInterface;
  *
  * @author Simon Mönch <sm@webfactory.de>
  */
-class UidProcessor implements ResettableInterface
+class UidProcessor implements ProcessorInterface, ResettableInterface
 {
     private $uid;
 
diff --git a/src/Monolog/Processor/WebProcessor.php b/src/Monolog/Processor/WebProcessor.php
index ea1d8978..684188f6 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