Looking at LandingPage counts, it seems there is either a significant difference in the contents of the log files for the two pipelines, or how the scripts are filtering events, or both.

Working on the assumption that the cause or causes of the discrepancy could be different for LandingPage events than for CentralNotice ones... It seems that the discrepancy in CentralNotice event counts can be explained by the fact that neither FRUEC nor the legacy script take into account client-side sample rate.

Also a large difference in log file contents for landing pages for a more recent date:

There's a wide difference in the number of events in the files being consumed:

Now deployed, seems to work!

Now deployed, seems to work!

Here are some suggestions on what to smoke test for any changes to the fallback loop. You could check all the following situations, each time looking for errors in the browser console and checking the contents of mw.centralNotice.data.

I'm closing this task, as the initial work is done, and the remaining work is now tracked separately.

This needs updating due to this schema change: https://gerrit.wikimedia.org/r/c/wikimedia/fundraising/FRUEC/+/541155

Done! Bwahahahahahah :)

Thanks so much!! Works great!

New data should be coming in fine, now, so we're ready for this any time. Thanks much!!!

Hi! We were able to deploy this fine! :) (Thanks much to @Ejegg for the help with that.)