Our Grafana dashboard is useful for spotting performance regressions. But it is not currently possible to look at data for specific wikis. We should use PrefixingStatsdDataFactoryProxy and then keep a short list (10 wikis?) to monitor performance by wiki. That would make it easier to spot issues like T308312: CacheDecorator does not work when AND filtering is enabled, where a wiki is seemingly performing worse than others, but that issue is lost in the aggregation of other wiki data.
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T240685: MediaWiki Prometheus support seems close enough to completion that I'd maybe just wait for that instead of creating a ton of new metrics.
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Change #1101850 had a related patch set uploaded (by Sergio Gimeno; author: Sergio Gimeno):
[mediawiki/extensions/GrowthExperiments@master] statslib(SuggestedEdits): migrate counter
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After discussing with @Michael we find that the change should be done for all charts in the Special:Homepage and Suggested Edits dashboard, the change can wait for when we build the new dashboard consuming Prometheus data.