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MediaWiki logging/debugging documentation is out of date
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Description

https://www.mediawiki.org/wiki/Manual:How_to_debug#Logging needs to be updated. In particular wfErrorLog() has been deprecated.

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kaldari raised the priority of this task from to Needs Triage.
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@bd808 wrote the replacement, maybe he can be bold. The extension/examples don't log anything (by design), and AFAICT the only extension that's cut over to MWLogger is EventLogging, because at WMF it uses a LegacyLogger to write to UDP, which is a bit advanced. Hmm.