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* Alerting: Fix alert flapping in the alertmanager fixes a bug that caused Alerts that are evaluated at low intervals (sub 1 minute), to flap in the Alertmanager. Mostly due to a combination of `EndsAt` and resend delay. The Alertmanager uses `EndsAt` as a heuristic to know whenever it should resolve a firing alert, in the case that it hasn't heard back from the alert generation system. Because grafana sent the alert with an `EndsAt` which is equal to the `For` of the alert itself, and we had a hard-coded 1 minute re-send delay (only applicable to firing alerts) this meant that a firing alert would resolve in the Alertmanager before we re-notify that it still firing. This commit, increases the `EndsAt` by 3x the the resend delay or alert interval (depending on which one is higher). The resendDelay has been decreased to 30 seconds. |
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| .. | ||
| cache_test.go | ||
| cache.go | ||
| manager_test.go | ||
| manager.go | ||
| state_test.go | ||
| state.go | ||