2003654 - Telemetry Alert for networking_http_channel_page_open_to_first_sent on 2025-11-15

Status: RESOLVED WONTFIX

(Testing :: Performance, defect, P5)

Description

[Treeherder Bug Filer]

MozDetect has detected changes in the following telemetry probes on builds from 2025-11-15. As the probe owner of the following probes, we need your help to address this regression and find a culprit.

Regressions

Probe	Platform	Magnitude	Previous Values	New Values
networking_http_channel_page_open_to_first_sent	Windows	1.9241802179450325	Median: 21428179.03	Median: 28242094.24
			P90: 2944467.94	P90: 3133906.07
			P95: 861817035.65	P95: 1018938083.81

See these Treeherder pushes for possible culprits for this detected change.

A push log can be found here for a quicker overview of the changes thatoccurred around this change.

For more information on how to handle these probe changes, and what the various columns mean see here.

Note that it’s possible the culprit is from a commit in the day before, or the day after these push logs. It’s also possible that these culprits are not the cause, and the change could be coming from a popular website. Please reach out to the Performance team if you suspect this to be the case in #perf on Matrix, or #perf-help on Slack.

See this bugzilla query for other telemetry alerts that were produced on this date.

Comment 1

[Greg Mierzwinski [:sparky]]

Triggered as part of the prototype.