You get the following error when you try to upgrade the esxi hosts in SDDC Manager.
esxi-3 – The ESXi cluster is not healthy (green) due to : vSphere HA failover operation in progress in cluster mgmt-cluster-01 in datacenter mgmt-datacenter-01: 0 VMs being restarted, 1 VMs waiting for a retry, 0 VMs waiting for resources, 0 inaccessible vSAN VMs.
For this error all you have to do is turn off HA and turn HA back on in your cluster
Go to your cluster click configure, click vSphere availability, click edit
Turn off HA and click ok
Then turn it back on once you see the tasks completed
Then rerun you sddc upgrade of your esxi hosts