This issue can occur due to Distributed Power Management.
To resolve this issue:
- Bring the host out of Standby Mode
- Edit setting on the cluster and disable Distributed Power Management
- Reconfigure high availability on any host that has this error
- Enable Distributed Power Management
Alternatively, you can disable and then enable HA. This causes a re-push of the HA agents and results in these alerts to cease.
To disable and re-enable HA:
- In the vSphere Client, right-click the cluster and click Edit Settings.
- Deselect the Turn On VMware HA option.
- Click OK.
- In the vSphere Client, right-click the cluster and click Edit Settings again.
- Select the Turn On VMware HA option.
- Click OK.