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Available from version 1.18.0 (r88843)
Removed in version 1.22.0
called when outputting a debug log line via wfDebug() or wfDebugLog()
Define function:
public static function onDebug( $text, $group ) { ... }
Attach hook:

In extension.json:

	"Hooks": {
		"Debug": "MyExtensionHooks::onDebug"

For MediaWiki ≤1.25:

$wgHooks['Debug'][] = 'MyExtensionHooks::onDebug';
Called from:File(s): GlobalFunctions.php

For more information about attaching hooks, see Manual:Hooks.
For examples of extensions using this hook, see Category:Debug extensions.