I am getting this alert 

VMM Agent Not Monitored By Operations Manager

I have VMM 2012 sp1 and SCOM 2012 sp1 so please kindly tell me the solution.

For VMM Agent Not Monitored By Operations Manager, Please, Send if there is error in event viewer

Also Check below link to help you in Fix your Issue

http://blogs.technet.com/b/operationsmgr/archive/2012/01/23/potential-issues-with-vmm-2012-opsmgr-integration.aspx

For Configuration of Operation Manager to monitor VMM, Refer to below link

http://www.systemcentercentral.com/configuring-pro-integration-between-opsmgr-2012-and-vmm-201

More info:

System Center Monitoring Pack for System Center 2012 - Virtual Machine Manager

http://www.microsoft.com/en-us/download/details.aspx?id=29679

This article helped me fix the issue.

http://www.systemcentercentral.com/research-kb-vmm-agent-monitored-operations-manager/

To fix it, I placed the server back into maintenance mode via the OpsMgr console under Windows Computers, and then stopped maintenance mode and was sure to have it remove all objects

• Proposed as answer by Matthias CECILLON 21 hours 37 minutes ago

This article helped me fix the issue.

http://www.systemcentercentral.com/research-kb-vmm-agent-monitored-operations-manager/

To fix it, I placed the server back into maintenance mode via the OpsMgr console under Windows Computers, and then stopped maintenance mode and was sure to have it remove all objects

• Proposed as answer by Matthias CECILLON Tuesday, July 07, 2015 9:33 AM

Other times to fix this, I've removed the connection between VMM and OpsMgr and re-established it.