udm_manager probe keeps restarting with a new PID. Looking at the log at loglevel 5 you will find the following error
Exception establishing Datomic connection: :db.error/not-enough-memory (datomic.objectCacheMax + datomic.memoryIndexMax) exceeds 75% of JVM RAM
Release : 9.2.0
Component : UNIFIED INFRASTRUCTURE MGMT
Below is an example of what will cause this problem. The datomic memory settings in question memory_index_max and object_cache_max exceed 75% of the java_mem_max:
Adjust the memory setting so that memory_index_max and object_cache_max do not exceed 75% of the java_mem_max.