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Telemetry Alert for HTTP_PAGE_CACHE_READ_TIME_V2 on 2019-10-23
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telemetr...@mozilla.com
Oct 27, 2019, 1:32:17 AM10/27/19
to dev-teleme...@lists.mozilla.org
We have detected a change in the Telemetry probe HTTP_PAGE_CACHE_READ_TIME_V2 in Firefox Nightly builds from 2019-10-23.
Alert details: http://alerts.telemetry.mozilla.org/index.html#/detectors/1/metrics/557/alerts/?from=2019-10-23&to=2019-10-23
Changes new to Nightly builds on 2019-10-23: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=47d7c18620c845c3a42610fea5468ccc50889bae&tochange=82274c20257455ffb7ea74404ee9d27bc4246819
The value of HTTP_PAGE_CACHE_READ_TIME_V2 over time: https://telemetry.mozilla.org/new-pipeline/evo.html#!measure=HTTP_PAGE_CACHE_READ_TIME_V2
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 HTTP_PAGE_CACHE_READ_TIME_V2 on 2019-10-23 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 HTTP_PAGE_CACHE_READ_TIME_V2'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/557/alerts/?from=2019-10-23&to=2019-10-23
Changes new to Nightly builds on 2019-10-23: https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=47d7c18620c845c3a42610fea5468ccc50889bae&tochange=82274c20257455ffb7ea74404ee9d27bc4246819
The value of HTTP_PAGE_CACHE_READ_TIME_V2 over time: https://telemetry.mozilla.org/new-pipeline/evo.html#!measure=HTTP_PAGE_CACHE_READ_TIME_V2
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 HTTP_PAGE_CACHE_READ_TIME_V2 on 2019-10-23 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 HTTP_PAGE_CACHE_READ_TIME_V2'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
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