/usr/lib/mperfmon/config is in mono-tools-gui 4.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14  | <?xml version='1.0' encoding='UTF-8'?>
<mperfmon>
	<update interval="1000" />
	<set name="MonoSummary">
		<counter cat=".NET CLR JIT" name="# of IL Methods JITted"/>
		<counter cat=".NET CLR Exceptions" name="# of Exceps Thrown"/>
		<counter cat="Process" name="Private Bytes"/>
		<counter cat=".NET CLR Memory" name="# Bytes in all Heaps"/>
		<counter cat=".NET CLR Memory" name="# Gen 0 Collections"/>
		<counter cat=".NET CLR Memory" name="# GC Handles"/>
		<counter cat=".NET CLR LocksAndThreads" name="Total # of Contentions"/>
		<counter cat=".NET CLR Loading" name="Bytes in Loader Heap"/>
	</set>
</mperfmon>
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