Adapter Engine Alerts are missing and no logs in ALRTDISP too

Hi Experts,

We have an alert rule in our production PI system configured for raising adapter engine alerts.

It was working fine since few years,suddenly we stop receiving alerts for any adapter engine failure messages,I tried to re-point the alert category in alert rule to use option "No restriction" just to validate, if we are able to receive integration engine failure alerts or not.

Then,I found it raising alerts for any integration engine related failed messages but not for Adapter engine .Also,no entries are logged in ALRTDISP tcode for adapter engine failed messages.

Any suggestion where i need to check.Is Basis need to look for some role enhancement as we are on 7.31 dual stack.

Regards
Deepak