After upgrading to VMware Aria operations 8.16.x and above, you will get to see repeated alerts "SDDC Config Notification - vCenter OS Credentials Missing" from the SDDC adapter as shown below:
VMware Aria operations 8.16.x and above
There is a platform change made in Aria operations 8.16.x and above which restricts adding the credentials only on Adapter instance resources from the inventory explorer.
This is a known issue affecting VMware Aria Operations version 8.16.x and above. This will be fixed in future release, please subscribe to this article for further updates.
Workaround is to disable the alert from the policy using one of the below steps:
1. Deactivate the alert from Active policy:
2. Create a new policy and deactivate the alert from the new policy:
NOTE: There are multiple alert definitions with the name "Notification". Make sure that the correct "Notification" alert is deactivated in the policy. Once deactivated, verify the correct "Notification" alert is disabled from the Configure > Alerts > Alert Definitions > Policies Enabled section as shown below.