This might explain the unexpectedly low results from the explore similar test. Not saying he fix would ensure usage, but it seems we lost quite a few events. This problem also effects autocompletd data we dashboard, although I don't think we've used it for tests recently. Full text search analytics should be unaffected as they don't use the mw.track functionality. ---------- Forwarded message ---------- From: "Sam Smith" <samsmith(a)wikimedia.org> Date: Oct 12, 2017 3:41 AM Subject: [Analytics] Heads up: mw.track client-side EventLogging mechanism "ignored" certain events To: "Analytics List" <analytics(a)lists.wikimedia.org> Cc: o/ Prior to Thursday, 28th September, if your client-side EventLogging instrumentation logged event via mw.track, then only events tracked during the first pageview of a user's session were logged. Now, technically, the events weren't ignored or dropped. Instead, the subscriber for the "event" topic was never subscribed when the module was loaded from the ResourceLoader's cache and so events published on that topic simply weren't received and logged. This bug was discovered while testing some instrumentation maintained by Readers Web [0] and independently by Timo Tijhof, who submitted the ideal fix [1] promptly. -Sam [0] https://phabricator.wikimedia.org/T175918 [1] https://gerrit.wikimedia.org/r/#/c/378804/ --- Engineering Manager Readers Timezone: BST (UTC+1) IRC (Freenode): phuedx _______________________________________________ Analytics mailing list Analytics(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/analytics _______________________________________________ Discovery mailing list Discovery(a)lists.wikimedia.org https://lists.wikimedia.org/mailman/listinfo/discovery