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Updated September 29th, 2016
Protocols to monitor Services in SAM
Basically you can monitor via:
It uses its own SNMP service, does not use the RPC service.
SAM help reference material:
An advantage to SNMP also is that it will retry the poll 3 times before marking it as unknown.
This is what WMI is not doing at the moment. If the WMI query fails to get a response on first attempt, it marks the component as unknown. SNMP will try 2 more times, then mark it as unknown.
Windows Performance Counters (RPC):
This is same as running cmd -> PERFMON
On windows Services. Operating System maintains all this counters and we can pull from them.
Only RPC and SNMP, does 3 retires if doesnt return values. WMI does not.
Also there are Documents on WMI\SMNP on site in links below and Videos Tutorials.