### Background
>>! From <https://wikitech.wikimedia.org/wiki/Incident_documentation/20140113-Poolcounter>:
> We had a partial "outage" of […] causing at least the Main Page not to be displayed, and anon users getting PoolCounter error messages instead.
>
> [There] were no signs that the poolcounter daemons weren't working correctly.
>
> The poolcounter.log on fluorine was being spammed with lots of "Queue full" messages.
### Context
>>! In T83729#8695241, @Krinkle wrote:
> Translation from 2014 into 2023:
>
> There were no alerts about poolcounter being degraded. "flourine" is a former host for the role now carried by `mwlog1002`. A proposed source of information to build an alert is the "poolcounter" Logstash channel where MediaWiki logs warnings/errors when it encounters an error.
>
> The objective, however you choose to solve it, is for there to be an alert when MediaWiki is perceiving degraded service from PoolCounter.
Related:
* {T84143}
* T83656}