anchor.diff:  
   		'handlers' => array(
   			'default' => array(
  -				'class' => 'MWLoggerMonologHandler',
  +				'class' => '\\MediaWiki\\Logger\\Monolog\\LegacyHandler',
   				'args' => array( '/vagrant/logs/monolog-'.date('Ymd').'.log' ),
  -				'formatter' => 'line',
   			),
   			'syslog' => array(
  -				'class' => 'MWLoggerMonologSyslogHandler',
  +				'class' => '\\MediaWiki\\Logger\\Monolog\\SyslogHandler',
   				'args' => array( 'mediawiki', '127.0.0.1', 10514 ),
   				'formatter' => 'logstash',
   			),
   			'profiler' => array(
  -				'class' => 'MWLoggerMonologHandler',
  +				'class' => '\\MediaWiki\\Logger\\Monolog\\LegacyHandler',
   				'args' => array( '/vagrant/logs/profiler-'.date('Ymd').'.log' ),
   				'formatter' => 'profiler',
   			),
   		),
   
   		'formatters' => array(
  -			'line' => array(
  -				'class' => '\\Monolog\\Formatter\\LineFormatter',
  -			),
   			'logstash' => array(
   				'class' => '\\Monolog\\Formatter\\LogstashFormatter',
   				'args'  => array( 'mediawiki', php_uname( 'n' ), null, '', 1 ),
  
positive.code: 
  		'processors' => array(
  			'wiki' => array(
  				'class' => 'MWLoggerMonologProcessor',
  			),
  			'psr' => array(
  				'class' => '\\Monolog\\Processor\\PsrLogMessageProcessor',
  
negative.code: $wgDBerrorLog = true;
  
  $wgMWLoggerDefaultSpi = array(
  	'class' => '\\MediaWiki\\Logger\\MonologSpi',
  	'args' => array( array(
  		'loggers' => array(
  			'@default' => array(
  