[ClusterLabs] pacemaker - Response 4 (part 1) to pid xyz failed

[lejeczek]

HI guys.

After an upgrade from pacemaker-2.1.10-2.el9 to 
pacemaker-3.0.1-5.el10 all pacemakers logs:
...
  notice: Response 2 (final part 2) to pid 204474 failed: 
Resource temporarily unavailable
  notice: Response 2 (final part 2) to pid 204474 failed: 
Resource temporarily unavailable
  notice: Response 2 (part 1) to pid 204481 failed: Resource 
temporarily unavailable
  notice: Response 2 (part 1) to pid 204481 failed: Resource 
temporarily unavailable
  notice: Response 2 (final part 2) to pid 204481 failed: 
Resource temporarily unavailable
  notice: Response 2 (final part 2) to pid 204481 failed: 
Resource temporarily unavailable
...

constantly.
Cluster does not signal - certainly not in any obvious way - 
there are any issues.
Does anybody know what those above are symptom of? How to 
troubleshoot it?
What resource it that which _pacemakers_ is complaining about?

many thanks, L.
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