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Telemetry Alert for GC_BUDGET_MS on 2019-11-08
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telemetr...@mozilla.com
Nov 14, 2019, 12:36:13 AM11/14/19
to dev-telemet...@mozilla.org, dev-teleme...@lists.mozilla.org
We have detected a change in the Telemetry probe GC_BUDGET_MS in Firefox Nightly builds from 2019-11-08.
Alert details: http://alerts.telemetry.mozilla.org/index.html#/detectors/1/metrics/1348/alerts/?from=2019-11-08&to=2019-11-08
Changes new to Nightly builds on 2019-11-08: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7748cc7e9b63d86a40eb4799c0830172da579c84&tochange=f414b9e6d85710f92649566c1c6511265dadd476
The value of GC_BUDGET_MS over time: https://telemetry.mozilla.org/new-pipeline/evo.html#!measure=GC_BUDGET_MS
What to do about this:
1. File a bug to track your investigation. You can just copy this email into the bug Description to get you started.
2. Reply-All to this email to let the list know that you are investigating. Include the bug number so we can help out.
3. Triage the alert. You can find instructions here: https://docs.telemetry.mozilla.org/tools/alerts.html#triaging-a-telemetry-alert-email
If you have any problems, please ask for help on the #telemetry IRC channel or on Slack in #fx-metrics. We'll give you a hand.
What this is:
We have a system called cerberus[1] that compares Telemetry collected on different Nightly builds and looks for sudden changed in value distributions using the Bhattacharyya Distance[2]. It found such a change in GC_BUDGET_MS on 2019-11-08 so it asked its buddy medusa[3] to send this email to the dev-telemetry-alerts mailing list and to all email addresses listed in the alert_emails field of GC_BUDGET_MS's definition.
You can do this!
Your Friendly, Neighbourhood Firefox Telemetry Team
[1]: https://github.com/mozilla/cerberus
[2]: https://en.wikipedia.org/wiki/Bhattacharyya_distance
[3]: https://github.com/mozilla/medusa
Alert details: http://alerts.telemetry.mozilla.org/index.html#/detectors/1/metrics/1348/alerts/?from=2019-11-08&to=2019-11-08
Changes new to Nightly builds on 2019-11-08: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=7748cc7e9b63d86a40eb4799c0830172da579c84&tochange=f414b9e6d85710f92649566c1c6511265dadd476
The value of GC_BUDGET_MS over time: https://telemetry.mozilla.org/new-pipeline/evo.html#!measure=GC_BUDGET_MS
What to do about this:
1. File a bug to track your investigation. You can just copy this email into the bug Description to get you started.
2. Reply-All to this email to let the list know that you are investigating. Include the bug number so we can help out.
3. Triage the alert. You can find instructions here: https://docs.telemetry.mozilla.org/tools/alerts.html#triaging-a-telemetry-alert-email
If you have any problems, please ask for help on the #telemetry IRC channel or on Slack in #fx-metrics. We'll give you a hand.
What this is:
We have a system called cerberus[1] that compares Telemetry collected on different Nightly builds and looks for sudden changed in value distributions using the Bhattacharyya Distance[2]. It found such a change in GC_BUDGET_MS on 2019-11-08 so it asked its buddy medusa[3] to send this email to the dev-telemetry-alerts mailing list and to all email addresses listed in the alert_emails field of GC_BUDGET_MS's definition.
You can do this!
Your Friendly, Neighbourhood Firefox Telemetry Team
[1]: https://github.com/mozilla/cerberus
[2]: https://en.wikipedia.org/wiki/Bhattacharyya_distance
[3]: https://github.com/mozilla/medusa
Jon Coppeard
Nov 14, 2019, 8:39:49 AM11/14/19
to telemetr...@mozilla.com, dev-telemet...@mozilla.org, dev-teleme...@lists.mozilla.org
This alert and the GC_SLOW_PHASE one are the expected result of landing
the following bug:
Bug 1593270 - Take account of adjusted slice budget when recording how
long over budget slices ran
This fixes a previous change that had caused us to report the slice
budget telemetry incorrectly. The budget reported is now the actual one
used, which is why it has increased in some cases (due to bug 1579426).
Jon
> _______________________________________________
> dev-telemetry-gc-alerts mailing list
> dev-telemet...@mozilla.org
> https://mail.mozilla.org/listinfo/dev-telemetry-gc-alerts
the following bug:
Bug 1593270 - Take account of adjusted slice budget when recording how
long over budget slices ran
This fixes a previous change that had caused us to report the slice
budget telemetry incorrectly. The budget reported is now the actual one
used, which is why it has increased in some cases (due to bug 1579426).
Jon
> dev-telemetry-gc-alerts mailing list
> dev-telemet...@mozilla.org
> https://mail.mozilla.org/listinfo/dev-telemetry-gc-alerts
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