Heartbeat failed after max retries

The MongoDB Cluster has been running not too badly but since a few days I get the above error. Version in use :

crVersion: 1.7.0
image: percona/percona-server-mongodb:4.4.3-5

Since this version has “close most files” after 27h hard coded, we have to restart it every 24h. Each restart of a pod takes about 30min. But right after the restart I see in the log the above message.

  1. Heartbeat failed after max retries : what is this about and how can I control this
  2. Is there any “limit” or why does the Pod restart ?
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