Michael created this task. Michael added projects: Wikidata, Wikibase-Lua, wmde-wikidata-tech. Restricted Application added a subscriber: Aklapper.
TASK DESCRIPTION **Steps to replicate the issue** (include links if applicable): - Go to https://grafana.wikimedia.org/d/jO1rYjwmz/wikidata-lua-function-usage?from=now-30d&orgId=1&to=now&var-prefix=enwiki&viewPanel=7 **What happens?**: Notice that the cache-miss rate is above 2, that is above 200%! **What should have happened instead?**: It should be something that is actually possible. **Other information** (browser name/version, screenshots, etc.): This seems to be caused by the fact that for the last 3 years, we only track a sample of the lua events for performance reason, about 1 in every 1000 events. That was introduced in Add a sample rate for Lua function call tracking <https://gerrit.wikimedia.org/r/c/mediawiki/extensions/Wikibase/+/674472>. That is achieved by comparing the sampling rate to a randomly generated number. **However, the random number generator is never explicitly initialized and so every request gets the exact same list of random numbers!** In practice, this would sadly seem to mean that the Lua tracking data of the last 3 years is almost completely worthless. TASK DETAIL https://phabricator.wikimedia.org/T360891 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Michael Cc: Aklapper, Michael, Danny_Benjafield_WMDE, S8321414, LennardHofmann, Astuthiodit_1, karapayneWMDE, Invadibot, maantietaja, ItamarWMDE, Akuckartz, Nandana, lucamauri, Lahi, Gq86, GoranSMilovanovic, QZanden, KimKelting, LawExplorer, _jensen, rosalieper, Scott_WUaS, Wikidata-bugs, aude, Mbch331
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