Privileged Access Manager (PAM) is configured with one or more Utility Appliances (UA) and a number of PAM Server Control (PAMSC) endpoints configured to send audit data to Splunk, but one of the UAs stopped sending messages to Splunk while the other is still working.
The ReportAgent daemon must be configured on the PAMSC endpoint in order to send audit information to the UAs, but older PAMSC endpoints have snapshot_enabled set to 1 by default, resulting in the endpoints sending snapshot information to the UAs as well. These snapshots are a legacy component and no longer consumed, so the message queue on the UA filled up and resulted in it crashing.
Disable the PAMSC endpoint from sending snapshots using the steps below.