https://github.com/wikimedia/mediawiki-extensions-NavigationTiming/commits/wmf/1.29.0-wmf.17:

• rENTIa7e536949034: build: Enable ESLint for tests/ and fix violations
• rENTI8957895a6e9e: ext.navigationTiming: Only load eventlogging when needed
• rENTI54d8b4232384: ext.navigationTiming: Move hoisted functions before statements

Most likely I broke something with 8957895a6e9e that somehow only affects Save Timing.

In T161368#3130149, @Krinkle wrote:>

Most likely I broke something with 8957895a6e9e that somehow only affects Save Timing.

Yup. It used to be that navtiming is sampled but save timing is not sampled. After my change, both are sampled. The sampling is meant to apply to page views, not edits. This changed reduce Save Timing rate from 250/minute to 0 most minutes, and 1 or 2 in others.
https://grafana.wikimedia.org/dashboard/db/eventlogging-schema?var-schema=SaveTiming

I'll fix this on Monday.

Change 345051 had a related patch set uploaded (by Krinkle):
[mediawiki/extensions/NavigationTiming@master] ext.NavigationTiming: Restore unsampled Save Timing

https://gerrit.wikimedia.org/r/345051

Change 345078 had a related patch set uploaded (by Krinkle):
[mediawiki/extensions/NavigationTiming@wmf/1.29.0-wmf.17] ext.NavigationTiming: Restore unsampled Save Timing

https://gerrit.wikimedia.org/r/345078

Change 345051 merged by jenkins-bot:
[mediawiki/extensions/NavigationTiming@master] ext.NavigationTiming: Restore unsampled Save Timing

https://gerrit.wikimedia.org/r/345051

Change 345078 merged by jenkins-bot:
[mediawiki/extensions/NavigationTiming@wmf/1.29.0-wmf.17] ext.NavigationTiming: Restore unsampled Save Timing

https://gerrit.wikimedia.org/r/345078

Mentioned in SAL (#wikimedia-operations) [2017-03-28T23:22:05Z] <thcipriani@tin> Synchronized php-1.29.0-wmf.17/extensions/NavigationTiming/modules/ext.navigationTiming.js: SWAT: [[gerrit:345078|ext.NavigationTiming: Restore unsampled Save Timing]] T161368 (duration: 00m 45s)

Recovered.