VMware vCenter Appliances uses a number of certificates. The following process can be used to check the certificate store and list all certificates and their expiry date.

1. SSH to vCenter Appliance as root
2. Enter "SHELL" to start bash shell
3. Enter "for i in $(/usr/lib/vmware-vmafd/bin/vecs-cli store list); do echo STORE $i; /usr/lib/vmware-vmafd/bin/vecs-cli entry list --store $i --text | egrep "Alias|Subject:|Not After"; done"
4. Output is displayed: 

   STORE MACHINE_SSL_CERT
   Alias : __MACHINE_CERT
               Not After : Jun 26 16:18:27 2022 GMT
           Subject: C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering, CN=vcenterapp01.sphere.local
   STORE TRUSTED_ROOTS
   Alias : 0a3e7d71b8e1b1596f52cb3546bfb332b5b45393
               Not After : Jul  4 11:12:39 2028 GMT
           Subject: CN=CA, DC=vsphere, DC=local, C=US, ST=California, O=vcenterapp01.sphere.local, OU=VMware Engineering
   Alias : 52dd8ea3112d50bdf34a86e0d663b90408c62685
               Not After : Nov 21 09:58:50 2024 GMT
           Subject: DC=local, DC=company, CN=Company CA
   Alias : 3346d1d1e0c2489ca6b5c71e7ffdb4f468cad4a3
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vcenterapp01.vsphere.local, DC=vsphere, DC=local, C=UK, ST=California, O=vcenterapp01.vsphere.local, OU=VMware Engineering
   STORE TRUSTED_ROOT_CRLS
   Alias : d88231de84f4be24edbe1b2c155757e943fdf9ea
   Alias : 0f1eb8fe5c431c6eafe6b1debfaa2c7ffa20de0d
   STORE machine
   Alias : machine
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=machine-32ee2d39-152d-442f-bf31-3d19fb35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   STORE vsphere-webclient
   Alias : vsphere-webclient
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vsphere-webclient-32ee2d39-152d-442f-bf31-3d19fb35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   STORE vpxd
   Alias : vpxd
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vpxd-32ee2d39-152d-442f-bf31-3d19fb35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   STORE vpxd-extension
   Alias : vpxd-extension
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vpxd-extension-32ee2d39-152d-442f-bf31-3d19f6n5c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   STORE SMS
   Alias : sms_self_signed
               Not After : Jul 10 11:20:36 2028 GMT
           Subject: O=VMware, CN=SMS-180729112031876
   STORE APPLMGMT_PASSWORD
   Alias : location_password_default
   STORE data-encipherment
   Alias : data-encipherment
               Not After : Jul  4 11:12:39 2028 GMT
           Subject: CN=data-encipherment, DC=vsphere, DC=local, C=US, OU=mID-32ee2d39-152d-442f-bf31-3d19fb35c19d
   STORE BACKUP_STORE
   Alias : bkp___MACHINE_CERT
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vcenterapp01.vsphere.local, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   Alias : bkp_machine
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=machine-32ee2d39-152d-442f-bf31-3d19fb35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   Alias : bkp_vsphere-webclient
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vsphere-webclient-32ee2d39-152d-442f-bf31-3d19fb35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   Alias : bkp_vpxd
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vpxd-32ee2d39-152d-442f-bf31-3d19fb35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   Alias : bkp_vpxd-extension
               Not After : Jul  5 18:26:37 2030 GMT
           Subject: CN=vpxd-extension-32ee2d39-152d-442f-bf31-3d19ced35c19d, C=UK, ST=California, L=Palo Alto, O=Company Ltd, OU=VMware Engineering
   

    

Inspect all the "Not After" date. If any certificates are about to expire then the certificate manager can be used to generate a new certificate.