1.8.0

• Break: the LineFormatter now strips newlines by default because this was a bug, set $allowInlineLineBreaks to true if you need them
• Added BrowserConsoleHandler to send logs to any browser's console via console.log() injection in the output
• Added FilterHandler to filter records and only allow those of a given list of levels through to the wrapped handler
• Added FlowdockHandler to send logs to a Flowdock account
• Added RollbarHandler to send logs to a Rollbar account
• Added HtmlFormatter to send prettier log emails with colors for each log level
• Added GitProcessor to add the current branch/commit to extra record data
• Added a Monolog\Registry class to allow easier global access to pre-configured loggers
• Added support for the new official graylog2/gelf-php lib for GelfHandler, upgrade if you can by replacing the mlehner/gelf-php requirement
• Added support for HHVM
• Added support for Loggly batch uploads
• Added support for tweaking the content type and encoding in NativeMailerHandler
• Added $skipClassesPartials to tweak the ignored classes in the IntrospectionProcessor
• Fixed batch request support in GelfHandler

1.7.0

• Added ElasticSearchHandler to send logs to an Elastic Search server
• Added DynamoDbHandler and ScalarFormatter to send logs to Amazon's Dynamo DB
• Added SyslogUdpHandler to send logs to a remote syslogd server
• Added LogglyHandler to send logs to a Loggly account
• Added $level to IntrospectionProcessor so it only adds backtraces when needed
• Added $version to LogstashFormatter to allow using the new v1 Logstash format
• Added $appName to NewRelicHandler
• Added configuration of Pushover notification retries/expiry
• Added $maxColumnWidth to NativeMailerHandler to change the 70 chars default
• Added chainability to most setters for all handlers
• Fixed RavenHandler batch processing so it takes the message from the record with highest priority
• Fixed HipChatHandler batch processing so it sends all messages at once
• Fixed issues with eAccelerator
• Fixed and improved many small things

1.6.0

• Added HipChatHandler to send logs to a HipChat chat room
• Added ErrorLogHandler to send logs to PHP's error_log function
• Added NewRelicHandler to send logs to NewRelic's service
• Added Monolog\ErrorHandler helper class to register a Logger as exception/error/fatal handler
• Added ChannelLevelActivationStrategy for the FingersCrossedHandler to customize levels by channel
• Added stack traces output when normalizing exceptions (json output & co)
• Added Monolog\Logger::API constant (currently 1)
• Added support for ChromePHP's v4.0 extension
• Added support for message priorities in PushoverHandler, see $highPriorityLevel and $emergencyLevel
• Added support for sending messages to multiple users at once with the PushoverHandler
• Fixed RavenHandler's support for batch sending of messages (when behind a Buffer or FingersCrossedHandler)
• Fixed normalization of Traversables with very large data sets, only the first 1000 items are shown now
• Fixed issue in RotatingFileHandler when an open_basedir restriction is active
• Fixed minor issues in RavenHandler and bumped the API to Raven 0.5.0
• Fixed SyslogHandler issue when many were used concurrently with different facilities

1.5.0

• Added ProcessIdProcessor to inject the PID in log records
• Added UidProcessor to inject a unique identifier to all log records of one request/run
• Added support for previous exceptions in the LineFormatter exception serialization
• Added Monolog\Logger::getLevels() to get all available levels
• Fixed ChromePHPHandler so it avoids sending headers larger than Chrome can handle