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• Fixed array access on null in RavenHandler
• Fixed unique_id in WebProcessor not being disableable

• Added JSON_INVALID_UTF8_SUBSTITUTE to default json flags, so that invalid UTF8 characters now get converted to � instead of being converted from ISO-8859-15 to UTF8 as it was before, which was hardly a comprehensive solution
• Added $ignoreEmptyContextAndExtra option to JsonFormatter to skip empty context/extra entirely from the output
• Added $parseMode, $disableWebPagePreview and $disableNotification options to TelegramBotHandler
• Added tentative support for PHP 8
• NormalizerFormatter::addJsonEncodeOption and removeJsonEncodeOption are now public to allow modifying default json flags
• Fixed GitProcessor type error when there is no git repo present
• Fixed normalization of SoapFault objects containing deeply nested objects as "detail"
• Fixed support for relative paths in RotatingFileHandler

• Fixed GitProcessor type error when there is no git repo present
• Fixed normalization of SoapFault objects containing deeply nested objects as "detail"
• Fixed support for relative paths in RotatingFileHandler

• Fixed ElasticsearchHandler swallowing exceptions details when failing to index log records
• Fixed normalization of SoapFault objects containing non-strings as "detail" in LineFormatter
• Fixed formatting of resources in JsonFormatter
• Fixed RedisHandler failing to use MULTI properly when passed a proxied Redis instance (e.g. in Symfony with lazy services)
• Fixed FilterHandler triggering a notice when handleBatch was filtering all records passed to it
• Fixed Turkish locale messing up the conversion of level names to their constant values

• Fixed formatting of resources in JsonFormatter
• Fixed RedisHandler failing to use MULTI properly when passed a proxied Redis instance (e.g. in Symfony with lazy services)
• Fixed FilterHandler triggering a notice when handleBatch was filtering all records passed to it
• Fixed Turkish locale messing up the conversion of level names to their constant values

• Fixed normalization of Traversables to avoid traversing them as not all of them are rewindable
• Fixed setFormatter/getFormatter to forward to the nested handler in FilterHandler, FingersCrossedHandler, BufferHandler, OverflowHandler and SamplingHandler
• Fixed BrowserConsoleHandler formatting when using multiple styles
• Fixed normalization of exception codes to be always integers even for PDOException which have them as numeric strings
• Fixed normalization of SoapFault objects containing non-strings as "detail"
• Fixed json encoding across all handlers to always attempt recovery of non-UTF-8 strings instead of failing the whole encoding
• Fixed ChromePHPHandler to avoid sending more data than latest Chrome versions allow in headers (4KB down from 256KB).
• Fixed type error in BrowserConsoleHandler when the context array of log records was not associative.

• Fixed normalization of Traversables to avoid traversing them as not all of them are rewindable
• Fixed setFormatter/getFormatter to forward to the nested handler in FilterHandler, FingersCrossedHandler, BufferHandler and SamplingHandler
• Fixed BrowserConsoleHandler formatting when using multiple styles
• Fixed normalization of exception codes to be always integers even for PDOException which have them as numeric strings
• Fixed normalization of SoapFault objects containing non-strings as "detail"
• Fixed json encoding across all handlers to always attempt recovery of non-UTF-8 strings instead of failing the whole encoding

• Fixed forward-compatible interfaces to be compatible with Monolog 1.x too.

• Deprecated SlackbotHandler, use SlackWebhookHandler or SlackHandler instead
• Deprecated RavenHandler, use sentry/sentry 2.x and their Sentry\Monolog\Handler instead
• Deprecated HipChatHandler, migrate to Slack and use SlackWebhookHandler or SlackHandler instead
• Added forward-compatible interfaces and traits FormattableHandlerInterface, FormattableHandlerTrait, ProcessableHandlerInterface, ProcessableHandlerTrait. If you use modern PHP and want to make code compatible with Monolog 1 and 2 this can help. You will have to require at least Monolog 1.25 though.
• Added support for RFC3164 (outdated BSD syslog protocol) to SyslogUdpHandler
• Fixed issue in GroupHandler and WhatFailureGroupHandler where setting multiple processors would duplicate records
• Fixed issue in SignalHandler restarting syscalls functionality
• Fixed normalizers handling of exception backtraces to avoid serializing arguments in some cases
• Fixed ZendMonitorHandler to work with the latest Zend Server versions
• Fixed ChromePHPHandler to avoid sending more data than latest Chrome versions allow in headers (4KB down from 256KB).

This changelog includes 2.0.0-beta* changelogs too, to see changes since beta2 check the CHANGELOG.md file.

• BC Break: This is a major release, see UPGRADE.md for details if you are coming from a 1.x release
• BC Break: PHP 7.2 is now the minimum required PHP version.
• BC Break: Removed SlackbotHandler, RavenHandler and HipChatHandler, see UPGRADE.md for details
• BC Break: Monolog\Logger: The record timezone is now set per Logger instance and not statically anymore
• BC Break: Monolog\Logger: Removed non-PSR-3 methods to add records, all the add* (e.g. addWarning) methods as well as emerg, crit, err and warn
• BC Break: Monolog\Logger: methods log/debug/info/notice/warning/error/critical/alert/emergency now have explicit void return types
• BC Break: Monolog\Logger: There is no more default handler configured on empty Logger instances
• BC Break: Quite a few interface changes, only relevant if you implemented your own handlers/processors/formatters
• BC Break: ElasticSearchHandler renamed to ElasticaHandler
• BC Break: Various handler-specific breaks, see UPGRADE.md for details
• Added scalar type hints and return hints in all the places it was possible. Switched strict_types on for more reliability.
• Added DateTimeImmutable support, all record datetime are now immutable, and will toString/json serialize with the correct date format, including microseconds (unless disabled)
• Added timezone and microseconds to the default date format
• Added FallbackGroupHandler which works like the WhatFailureGroupHandler but stops dispatching log records as soon as one handler accepted it
• Added OverflowHandler which will only flush log records to its nested handler when reaching a certain amount of logs (i.e. only pass through when things go really bad)
• Added TelegramBotHandler to log records to a Telegram bot account
• Added SendGridHandler to use the SendGrid API to send emails
• Added NoopHandler which is similar to the NullHandle but does not prevent the bubbling of log records to handlers further down the configuration, useful for temporarily disabling a handler in configuration files
• Added ProcessHandler to write log output to the STDIN of a given process
• Added LogmaticHandler to use the Logmatic.io API to store log records
• Added SqsHandler to send log records to an AWS SQS queue
• Added ElasticsearchHandler to send records via the official ES library. Elastica users should now use ElasticaHandler instead of ElasticSearchHandler
• Added HostnameProcessor that adds the machine's hostname to log records
• Added a $dateFormat option to the PsrLogMessageProcessor which lets you format DateTime instances nicely
• Added support for the PHP 7.x mongodb extension in the MongoDBHandler
• Added support for RFC3164 (outdated BSD syslog protocol) to SyslogUdpHandler
• Added support for JsonSerializable when normalizing exceptions
• Added SoapFault details to formatted exceptions
• Improved performance of LogglyHandler when sending multiple logs in a single request
• Fixed support for UTF-8 when cutting strings to avoid cutting a multibyte-character in half
• Fixed normalizers handling of exception backtraces to avoid serializing arguments in some cases
• Fixed date timezone handling in SyslogUdpHandler
• Fixed DeduplicationHandler silently failing to start when file could not be opened
• Fixed issue in GroupHandler and WhatFailureGroupHandler where setting multiple processors would duplicate records
• Fixed GelfFormatter losing some data when one attachment was too long
• Fixed issue in SignalHandler restarting syscalls functionality
• Fixed many minor issues in various handlers, and probably added a few regressions too