Andrew Halberstadt e7e4e3ee6a Bug 1660506 - [taskgraph] Ensure backstop determination uses time since last backstop, r=marco
Backstop pushes have a time component so that we can guarantee they run at least every N
hours. Prior, they measured the time since the last push. This means that as long as a new
push comes in at least once every 4 hours, the backstop would keep being pushed out.

This means we could theoretically go 80 hours without a backstop push, which makes finding
merge candidates tricky.

This change ensures we measure the 4 hours as time since last backstop, as opposed to time
since last push.

Differential Revision: https://phabricator.services.mozilla.com/D88913
2020-09-01 18:42:57 +00:00
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