Debug: $wgDebugLogGroups
Direct wfDebugLog() output for certain groups to files other than $wgDebugLogFile .
Introduced in version:1.5.0 (r10598)
Removed in version:still in use
Allowed values:(array of log group keys to filenames)
Default value:[]
Other settings: Alphabetical | By function

Details

Set to an array of log group keys to filenames. If set, wfDebugLog() output for that group will go to that file instead of the regular $wgDebugLogFile. Useful for enabling selective logging in production.

If a group is configured in $wgDebugLogGroups, then all debug messages with the according group key will be logged to that file, also if $wgDebugLogFile is not set! With other words: If a group key is configured in $wgDebugLogGroups, messages will be written, even if an empty value of $wgDebugLogFile generally disables debugging.

Log destinations may be one of the following:

  • false to completely remove from the output, including from $wgDebugLogFile.
  • string values specifying a filename or URI.
  • associative array with keys:
    • 'destination' desired filename or URI.
    • 'sample' an integer value, specifying a sampling factor (optional)
    • 'level' A \Psr\Log\LogLevel constant, indicating the minimum level log (optional, since 1.25)

When $wgMWLoggerDefaultSpi is set to a non-default value, $wgDebugLogGroups will probably be ignored, and the method of configuring log files will be determined by whatever logging system is invoked by $wgMWLoggerDefaultSpi.

Example

This example logs debug messages of group "ConfirmEditExtension" to "debug-ext_confirmedit.log" and those of group "SpamRegex" to "debug-spam.log".

$wgDebugLogGroups = [
	'ConfirmEditExtension'	=> $IP . '/../../home/debug-ext_confirmedit.log',
	'SpamRegex'		=> $IP . '/../../home/debug-spam.log',
];

Example:

$wgDebugLogGroups['redis'] = '/var/log/mediawiki/redis.log';

Advanced example:

 $wgDebugLogGroups['memcached'] = [
     'destination' => '/var/log/mediawiki/memcached.log',
     'sample' => 1000,  // <translate nowrap><!--T:21--> log 1 message out of every 1,000.</translate>
     'level' => \Psr\Log\LogLevel::WARNING,
 ];
 $wgDebugLogGroups['redis'] = [
     'destination' => '/var/log/mediawiki/redis.log',
     // <translate nowrap><!--T:22--> Level can also be the literal string value of any Psr\Log\LogLevel constant</translate>
     'level' => 'info',
 ];
Multiple log groups in a single file
You might want to setup a temporary configuration like the following to see all authentication related logging to trouble-shoot authentication.
$wgDebugLogGroups['cookie'] =
$wgDebugLogGroups['session'] =
$wgDebugLogGroups['SimpleSAMLphp'] =
$wgDebugLogGroups['PluggableAuth'] = "$IP/cache/PluggableAuth.log";

Some common debug log groups

  • exception, error, fatal - errors
  • deprecated - deprecation warnings
  • objectcache, caches, memcached/SQLBagOStuff - cache
  • DBPerformance, DBReplication, DBConnection - database
  • DBQuery - all DB queries
  • cookie - response cookies
  • exec - shell commands
  • session - SessionManager
  • authentication, login - AuthManager
  • ratelimit, throttler - hitting rate limits ($wgRateLimits and other)
  • resourceloader, ResourceLoaderImage - ResourceLoader
  • http, HttpError - HTTP requests to external services (via the Http/MwHttpRequest classes)
  • api - API
  • thumbnail, fileupload, fileconcatenate - image-related
  • runJobs - Job queue
  • parser, ParserCache - Parser
  • slow-parse - warnings about pages that take long to parse
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