We have detected a build metrics regression from push: https://hg.mozilla.org/integration/mozilla-inbound/rev/ef4f0721733f7c1e7613c99fae6b3c9899c6d81d As author of one of the patches included in that push, we need your help to address this regression. Regressions: 64% sccache requests_not_cacheable summary android-4-2-x86 opt taskcluster-m4.2xlarge 16.46 -> 27.00 You can find links to graphs and comparison views for each of the above tests at: https://treeherder.mozilla.org/perf.html#/alerts?id=10281 On the page above you can see an alert for each affected platform as well as a link to a graph showing the history of scores for this test. There is also a link to a treeherder page showing the jobs in a pushlog format. To learn more about the regressing test(s), please see: https://developer.mozilla.org/en-US/docs/Mozilla/Performance/Automated_Performance_Testing_and_Sheriffing/Build_Metrics