vSphere 6.5 Proactive HA detect hw condition evacuate host before failure (plugin provided OEM vendors)
Quarantine mode - host is placed in quarantine mode if it is considered in degraded state
Simplified vSphere HA Admission Control - "Percentage of Cluster Resources" admission control policy
VMware HA restarts virtual machines according to defined restart priorities and monitors capacity needs required for defined level of failover.
VMware, vSphere/6.7, vSphere with Operations Management Enterprise Plus