3756821 - Primary database went down automatically and system failed over with no visible caused

Primary database went down automatically and the system switched over to the secondary database; 

There is not visible symptom in the trace files: i.e. nameserver, indexserver, daemon, var/log/messages 

In the  /var/log/messages you can see HANA checks are happening regularly with no issues reported (rc=0), but there is a "demote request" close to the time of the issue just milliseconds after a monitoring check finishes with no alerts:

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202X-xx-02T11:08:34.811420+ ...node1... SAPHanaTopology(rsc_SAPHanaTopology_<SID>_HDB<instance>)[PID]: INFO: RA ==== end action monitor_clone with rc=0 (0.162.5) (577s)====

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202X-xx-02T11:08:34.824093+ node1 pacemaker-controld[PID]: notice: Requesting local execution of demote operation for rsc_SAPHana_<SID>_HDB<instance> on ...node1

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• SAP HANA, platform edition
• SAP HANA DB Engines

hana primary down, automatic failover, pacemaker demote, IPC timeout, rsyslogd saturation, syslog flooding, audit policy, health check timeout, cluster timeouts, system replication, sigint 2, demotion , KBA , HAN-DB-HA , SAP HANA High Availability (System Replication, DR, etc.) , Problem