In some cases the service fsvm-sockrelay might try to consume more than the assigned hard-limit of assigned memory and tries exceeding its limit. When said service requests more memory than allowed, vmkernel is rejecting the memory assignment and logs "Admission failure". This can lead to the service misbehaving.
When this service misbehaves and communication issues between ESXi and the vSAN File Service Node-VM is present, in rare cases this can lead to file share failover mechanism failing and not being able to find remaining healthy hosts, leading to inaccessible file shares.