ESXi Host Certificate Status" in the vSphere Client. This occurs when the host's SSL certificate is nearing or past its expiration date.vCenter 7.x
vCenter 8.x
For vSAN witness host certificate renewal, the process is identical to that of a standard ESXi host using the vSphere Client.
How to renew the certificate: https://knowledge.broadcom.com/external/article?articleNumber=374032