Alert only if certain time passed

I’m trying to avoid receiving false alerts/spam-like notifications when applications' health status change briefly e.g `degraded/unknown <-> healthy` often within a minute.

I tried to add the following time condition to alert if the app has been in the current state for 5 mins or more but it’s not working, or maybe I’m using the wrong field `app.status.operationState.startedAt` here?

```yaml
trigger.on-health-degraded: |
- description: Application has degraded
oncePer: app.status.operationState.syncResult.revision
send:
- app-health-degraded
when: app.status.health.status == 'Degraded' and time.Now().Sub(time.Parse(app.status.operationState.startedAt)).Minutes() >= 5
```

I'm curious if anyone solved this issue using argocd-notifications?

Start by reproducing the health-status flap using the trigger.on-health-degraded configuration and the app.status fields shown in the issue. Check which timestamp represents time in the current health state and define the behavior for transitions; done means notifications are suppressed until the state has remained degraded for at least five minutes.

Written by the indexing model from the issue text.