dcausse added a comment.
In T285710#7261551 <https://phabricator.wikimedia.org/T285710#7261551>, @Legoktm wrote: > @Gehel what ends up consuming that value? Can we have it read the primary DC from conftool? > > For now I've documented this as a manual step: https://wikitech.wikimedia.org/w/index.php?title=Switch_Datacenter&type=revision&diff=1920831&oldid=1920827 The system is passed a topic name at startup used as a reference for the lag (https://gerrit.wikimedia.org/r/plugins/gitiles/wikidata/query/rdf/+/refs/heads/master/tools/src/main/java/org/wikidata/query/rdf/tool/change/KafkaPoller.java#365). The updater then only reports the timestamp of this topic to blazegraph which is then consumed by a prometheus exporter. The way this "timestamp" (lag) is determined should be changed to either: - determine dynamically what is the "reportingTopic" calling conftool to know where eventgate is pushing MW events - do what the new updater is doing (T244590 <https://phabricator.wikimedia.org/T244590>): compute an avg of the timestamps instead Because none of these changes would be trivial I think we prefer to wait for the new system to be in place. TASK DETAIL https://phabricator.wikimedia.org/T285710 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: dcausse Cc: dcausse, Legoktm, Gehel, Aklapper, Invadibot, MPhamWMF, maantietaja, CBogen, Akuckartz, RhinosF1, Nandana, Namenlos314, jijiki, Lahi, Gq86, Lucas_Werkmeister_WMDE, GoranSMilovanovic, QZanden, EBjune, merbst, LawExplorer, Volans, _jensen, rosalieper, Scott_WUaS, Jonas, Xmlizer, jkroll, Wikidata-bugs, Jdouglas, aude, Tobias1984, Manybubbles, Addshore, Mbch331, Krenair, akosiaris
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