When trying to monitor MCSIO performance, you are unable to find the perf counters for MCSIO.

For MCSIOv2 since CVAD 1903 release, you can get MCSIO performance counters with the following:
PS C:\Windows\system32> (Get-Counter -ListSet "Citrix MCS").Paths
\Citrix MCS(*)\Parent Read Bytes/sec
\Citrix MCS(*)\Parent Reads/sec
\Citrix MCS(*)\RAM Write Bytes/sec
\Citrix MCS(*)\RAM Read Bytes/sec
\Citrix MCS(*)\RAM Writes/sec
\Citrix MCS(*)\RAM Reads/sec
\Citrix MCS(*)\RAM Cache Bytes
\Citrix MCS(*)\File Write Bytes/sec
\Citrix MCS(*)\File Read Bytes/sec
\Citrix MCS(*)\File Writes/sec
\Citrix MCS(*)\File Reads/sec
\Citrix MCS(*)\File Bytes

These counters should be available in Perfmon.