I created a pre-processing rule in NAS to exclude some alarms. After removing the alarm they still come back at the next polling interval of the probe and I still see them in IM and USM.
Release : 8.x / 9.x
Component : UIM NAS
If the pre-processing "exclude" rule is not excluding the alarm despite the matching criteria applies to the alarm it might be because the alarm is coming from a different replication nas/hub.
If the alarm comes from a probe attached to a remote hub with its own nas (therefore not the nas the pre-processing profile has been defined on) then the alarm replication will bypass the pre-processing rule. If the alarm comes from a remote hub/nas try to add the pre-processing in the remote hub/nas.
The pre-processing intercepts alarms before they reach the nas. NAS Replication happens from nas to nas. So if an alarm reaches one of the replication nas'es, pre-processing rules are not applied.