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Alerting: Fix state transition from Recovering back to Alerting (#103286)

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What is this feature?

This PR fixes a state transition issue where alerts transitioning from the Recovering state back to the Alerting state incorrectly entered the Pending state first if the rule had a For duration configured.

Why do we need this feature?

When an alert goes from Alerting to Recovering (when using the Keep firing for) and then back to Alerting, the existing logic would incorrectly put the alert into Pending state while it should be alerting and still sending notifications to the Alertmanager.
This commit is contained in:
Alexander Akhmetov
2025-04-03 11:40:45 +03:00
committed by GitHub
parent 5bc053730b
commit b49c532999
3 changed files with 559 additions and 3 deletions
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pkg/services/ngalert/state/state.go
+3 -2
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@@ -417,8 +417,9 @@ func resultAlerting(state *State, rule *models.AlertRule, result eval.Result, lo
}
default:
nextEndsAt := nextEndsTime(rule.IntervalSeconds, result.EvaluatedAt)
if rule.For > 0 {
// If the alert rule has a For duration that should be observed then the state should be set to Pending
if state.State != eval.Recovering && rule.For > 0 {
// If the alert rule has a For duration that should be observed then the state should be set to Pending.
// If the alert is currently in the Recovering state then we skip Pending and set it directly to Alerting.
logger.Debug("Changing state",
"previous_state",
state.State,