Debug logging

Classes
class	MediaWiki\Logger\Monolog\BufferHandler
	Helper class for the index.php entry point. More...
class	MediaWiki\Logger\Monolog\CeeFormatter
	Prefixed version of LogstashFormatter that adds a "cee cookie" for Rsyslog. More...
class	MediaWiki\Logger\ConsoleLogger
	Write logs to command-line output (STDERR). More...
class	MediaWiki\Logger\ConsoleSpi
	ConsoleLogger service provider for MediaWiki\Logger\LoggerFactory. More...
class	MediaWiki\Logger\Monolog\LegacyFormatter
	Log message formatter that mimics the legacy log message formatting of wfDebug, wfDebugLog, wfLogDBError and the former wfErrorLog global functions by delegating the formatting to \MediaWiki\Logger\LegacyLogger. More...
class	MediaWiki\Logger\Monolog\LegacyHandler
	Monolog imitation of MediaWiki\Logger\LegacyLogger. More...
class	MediaWiki\Logger\LegacyLogger
	PSR-3 logger that mimics the historic implementation of MediaWiki's former wfErrorLog logging implementation. More...
class	MediaWiki\Logger\LegacySpi
	The default service provider for MediaWiki\Logger\LoggerFactory, which creates LegacyLogger objects. More...
class	MediaWiki\Logger\Monolog\LineFormatter
	Formats incoming records into a one-line string. More...
class	MediaWiki\Logger\LogCapturingSpi
	Wrap another Spi and keep a copy of all log messages. More...
class	MediaWiki\Logger\LoggerFactory
	Create PSR-3 logger objects. More...
class	MediaWiki\Logger\Monolog\LogstashFormatter
	Modified version of Monolog\Formatter\LogstashFormatter. More...
class	MediaWiki\Logger\MonologSpi
	LoggerFactory service provider that creates loggers implemented by Monolog. More...
class	MWDebug
	Debug toolbar. More...
class	MediaWiki\Logger\Monolog\MwlogHandler
	Write logs to syslog with the channel appended to the application name. More...
class	MediaWiki\Logger\NullSpi
	LoggerFactory service provider that creates \Psr\Log\NullLogger instances. More...
interface	MediaWiki\Logger\Spi
	Service provider interface to create \Psr\Log\LoggerInterface objects. More...
class	MediaWiki\Logger\Monolog\SyslogHandler
	Write logs to a syslog server, using RFC 3164 formatted UDP packets. More...
class	MediaWiki\Logger\Monolog\WikiProcessor
	Annotate log records with request-global metadata, such as the hostname, wiki / request ID, and MediaWiki version. More...

Detailed Description

To primary APIs for this feature, and the classes where their documentation starts, are:

• MediaWiki\Logger\LoggerFactory, this creates all logger objects at run time.
• MediaWiki\Logger\Spi, to develop or configure the service classes that internally create logger objects. For example, MediaWiki\Logger\LegacyLogger is the default Spi that backs features like $wgDebugLogFile. MediaWiki\Logger\MonologSpi is an Spi you can opt-in to via $wgMWLoggerDefaultSpi to enable structured logging with destinations like Syslog and Logstash, and "processor" and "formatter" features to augment messages with metadata, as powered by the Monolog library.
• MWDebug, the logic behind $wgDebugToolbar.

See also

Logger documentation in docs/Logger.md