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UPGRADE.md

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3.0.0

Overall / notable changes:

  • The minimum supported PHP version is now 8.1.0.
  • Monolog\Logger::API can be used to distinguish between a Monolog 3, 2 or 1 install when writing integration code.
  • Log records have been converted from an array to a Monolog\LogRecord object with public (and mostly readonly) properties. e.g. instead of doing $record['context'] use $record->context. In formatters or handlers if you rather need an array to work with you can use $record->toArray() to get back a Monolog 1/2 style record array. This will contain the enum values instead of enum cases in the level and level_name keys to be more backwards compatible and use simpler data types.
  • FormatterInterface, HandlerInterface, ProcessorInterface, etc. changed to contain LogRecord $record instead of array $record parameter types. If you want to support multiple Monolog versions this should be possible by type-hinting nothing, or array|LogRecord if you support PHP 8.0+. You can then code against the $record using Monolog 2 style as LogRecord implements ArrayAccess for BC. The interfaces do not require a LogRecord return type even where it would be applicable, but if you only support Monolog 3 in integration code I would recommend you use LogRecord return types wherever fitting to ensure forward compatibility as it may be added in Monolog 4.
  • Log levels are now stored as an enum Monolog\Level
  • All properties have had types added, which may require you to do so as well if you extended a Monolog class and declared the same property.

Logger

  • Logger::DEBUG, Logger::ERROR, etc. are now deprecated in favor of the Level enum. e.g. instead of Logger::WARNING use Level::Warning if you need to pass the enum case to Monolog or one of its handlers, or Level::Warning->value if you need the integer value equal to what Logger::WARNING was giving you.
  • Logger::$levels has been removed.
  • Logger::getLevels has been removed in favor of Monolog\Level::VALUES or Monolog\Level::cases().
  • setExceptionHandler now requires a Closure instance and not just any callable.

HtmlFormatter

  • If you redefined colors in the $logLevels property you must now override the getLevelColor method instead.

NormalizerFormatter

  • A new normalizeRecord method is available as an extension point which is called only when converting the LogRecord to an array. You may need this if you overrode format previously as parent::format now needs to receive a LogRecord still so you cannot modify it before.

AbstractSyslogHandler

  • If you redefined syslog levels in the $logLevels property you must now override the toSyslogPriority method instead.

DynamoDbHandler

  • Dropped support for AWS SDK v2

FilterHandler

  • The factory callable to lazy load the nested handler must now be a Closure instance and not just a callable.

FingersCrossedHandler

  • The factory callable to lazy load the nested handler must now be a Closure instance and not just a callable.

GelfHandler

  • Dropped support for Gelf <1.1 and added support for graylog2/gelf-php v2.x. File, level and facility are now passed in as additional fields (#1664)[#1664].

RollbarHandler

  • If you redefined rollbar levels in the $logLevels property you must now override the toRollbarLevel method instead.

SamplingHandler

  • The factory callable to lazy load the nested handler must now be a Closure instance and not just a callable.

SwiftMailerHandler

  • Removed deprecated SwiftMailer handler, migrate to SymfonyMailerHandler instead.

ZendMonitorHandler

  • If you redefined zend monitor levels in the $levelMap property you must now override the toZendMonitorLevel method instead.

ResettableInterface

  • reset() now requires a void return type.

2.0.0

  • Monolog\Logger::API can be used to distinguish between a Monolog 1 and 2 install of Monolog when writing integration code.

  • Removed non-PSR-3 methods to add records, all the add* (e.g. addWarning) methods as well as emerg, crit, err and warn.

  • DateTime are now formatted with a timezone and microseconds (unless disabled). Various formatters and log output might be affected, which may mess with log parsing in some cases.

  • The datetime in every record array is now a DateTimeImmutable, not that you should have been modifying these anyway.

  • The timezone is now set per Logger instance and not statically, either via ->setTimezone or passed in the constructor. Calls to Logger::setTimezone should be converted.

  • HandlerInterface has been split off and two new interfaces now exist for more granular controls: ProcessableHandlerInterface and FormattableHandlerInterface. Handlers not extending AbstractHandler should make sure to implement the relevant interfaces.

  • HandlerInterface now requires the close method to be implemented. This only impacts you if you implement the interface yourself, but you can extend the new Monolog\Handler\Handler base class too.

  • There is no more default handler configured on empty Logger instances, if you were relying on that you will not get any output anymore, make sure to configure the handler you need.

LogglyFormatter

  • The records' datetime is not sent anymore. Only timestamp is sent to Loggly.

AmqpHandler

  • Log levels are not shortened to 4 characters anymore. e.g. a warning record will be sent using the warning.channel routing key instead of warn.channel as in 1.x.
  • The exchange name does not default to 'log' anymore, and it is completely ignored now for the AMQP extension users. Only PHPAmqpLib uses it if provided.

RotatingFileHandler

  • The file name format must now contain {date} and the date format must be set to one of the predefined FILE_PER_* constants to avoid issues with file rotation. See setFilenameFormat.

LogstashFormatter

  • Removed Logstash V0 support
  • Context/extra prefix has been removed in favor of letting users configure the exact key being sent
  • Context/extra data are now sent as an object instead of single keys

HipChatHandler

  • Removed deprecated HipChat handler, migrate to Slack and use SlackWebhookHandler or SlackHandler instead

SlackbotHandler

  • Removed deprecated SlackbotHandler handler, use SlackWebhookHandler or SlackHandler instead

RavenHandler

  • Removed deprecated RavenHandler handler, use sentry/sentry 2.x and their Sentry\Monolog\Handler instead

ElasticSearchHandler

  • As support for the official Elasticsearch library was added, the former ElasticSearchHandler has been renamed to ElasticaHandler and the new one added as ElasticsearchHandler.