SIEM is a reporting system.
W3wp.exe runs an IIS APP Pool (in this case, one named "FarmStateManager").
If the alert doesn't say what the problem was (or is) I don't think anyone's going to be able to help you.
I'll echo the answer from @Kael Yao-MSFT , though. Your problem has nothing to do with PowerShell. You should remove that windows-server-powershell. I think a more appropriate one would contain IIS -- but without an error message, that alert is pretty worthless.