I have two Management Servers, one of them is Root Management Server and the other is Site Management Server.
I have an alert about the site management server. The Alert is:
"Agent proxying needs to be enabled for a health service to submit discovery data about other computers"
In the knowledge base of the SCOM itself, it's mentioned that I should enable proxying, but that is specifically for Agent Managed, not the Management Servers. However, I did enable proxying on this management server, but the alert is still appearing.