Replying to myself here so hopefully someone else will find it 
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The best way to get this type of list is Get-StatType[Interval|Type].
The reason is that any doc might not be as up-to-date as the actual server (upgrades, patches, etc.).
Ref: PowerCLI & vSphere statistics - Part 1 - The basics | LucD notesLucD notes
and for 5.1: VMware vSphere 5.1