about notification suppressed ...

[xpertech]

a monitor state was flapping and then the notification suppressed, will the notification back to normal automatically? for how long?

[benjaminsmith]

Hello @xpertech,

Yes, once the service stops flapping, the suppression of notifications will be removed. Here's how flapping is handled in Nagios Core,

When a service or host is first detected as flapping, Nagios will:
1. Log a message indicating that the service or host is flapping.
2. Add a non-persistent comment to the host or service indicating that it is flapping.
3. Send a "flapping start" notification for the host or service to appropriate contacts.
4. Suppress other notifications for the service or host (this is one of the filters in the notification logic).

When a service or host stops flapping, Nagios will:
1. Log a message indicating that the service or host has stopped flapping.
2. Delete the comment that was originally added to the service or host when it started flapping.
3. Send a "flapping stop" notification for the host or service to appropriate contacts.
4. Remove the block on notifications for the service or host (notifications will still be bound to the normal notification logic).

See: Detection and Handling of State Flapping

You also have the option of disabling flap detection or adjusting the high and low flap thresholds.