The logic of the work of HA

[Maksimus]

Over the weekend, in a cluster of 5 nodes, one lost connection with its neighbors. HA worked normally and migrated the VM to another node. The node itself rebooted. Could HA reboot it or some service, there is nothing about the reboot in the logs.

 

[VictorSTS]

If you have HA resources in a node and that node loses quorum, the node will fence itself by a reboot to free up any resource it might be using so HA VM's/CT's will be able to start in other nodes of the cluster [1].

[1] https://pve.proxmox.com/wiki/High_Availability#ha_manager_fencing