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* [https://wiki.mozilla.org/Buildbot/Talos/Sheriffing/Tree_FAQ#What_is_PGO pgo/nonpgo] (some errors are pgo only and might be a side effect of pgo). We only ship PGO, so these are the most important.
* test/infrastructure change - once in a while we change big things about our tests or infrastructure and it affects our tests (we need bugs to document these those)
* [https://wiki.mozilla.org/Buildbot/Talos/Sheriffing/Tree_FAQ#What_is_a_merge Merged]] - sometimes the root cause looks to be a merge, this is a normall a side effect of [https://wiki.mozilla.org/Buildbot/Talos/Sheriffing/Tree_FAQ#What_is_coalescing Coalescing].
* [https://wiki.mozilla.org/Buildbot/Talos/Sheriffing/Tree_FAQ#What_is_coalescing Coalesed] - this is when we don't run every job on every platform on every push and sometimes we have a set of changes
* Regular regression - the normal case where we get an alert and we see it merge from branch to branch
