Description of problem:
CU experienced several fencing at pacemaker controller nodes due to failure on monitoring rabbit-mq cluster resource. the following get logged during the fault:

~~~
2024-05-16 00:14:37.945764+02:00 [error] <0.9405.0> ** Node 'rabbit@controllernodeNN.example.domain.com' not responding **
2024-05-16 00:14:37.945764+02:00 [error] <0.9405.0> ** Removing (timedout) connection **
2024-05-16 00:14:37.945764+02:00 [error] <0.9405.0>
2024-05-16 00:14:37.945976+02:00 [notice] <0.9404.0> TLS server: In state connection at tls_connection_1_3.erl:633 generated SERVER ALERT: Fatal - Internal Error
2024-05-16 00:14:37.945976+02:00 [notice] <0.9404.0> - closed
~~~

it turned out that disabling SSL at rabbitmq by changing rabbitmq-env.conf in the following way solved the issue:

from:
RABBITMQ_CTL_ERL_ARGS="+sbwt none +sbwtdcpu none +sbwtdio none -ssl_dist_optfile /etc/rabbitmq/ssl-dist.conf -crypto fips_mode false -pa /usr/lib64/erlang/lib/ssl-10.7.3.2/ebin -proto_dist inet_tls"
RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="+sbwt none +sbwtdcpu none +sbwtdio none -ssl_dist_optfile /etc/rabbitmq/ssl-dist.conf -crypto fips_mode false -pa /usr/lib64/erlang/lib/ssl-10.7.3.2/ebin -proto_dist inet_tls"

to:
RABBITMQ_CTL_ERL_ARGS="+sbwt none +sbwtdcpu none +sbwtdio none"
RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="+sbwt none +sbwtdcpu none +sbwtdio none"

Version-Release number of selected component (if applicable):
OSP 17.1.2