Can you confirm you have support for Percona Mongodb 3.6.10?
I've installed and tried to configure mongodb_monitor probe without success, I know you have support for Mongodb 3.6 and 4.0 with the latest prbe version (2.0) which is the same probe version I'm using without success, the only difference is I'm using the Percona version of Mongo 3.6.10.
Release : 9.2.0
Component : UIM - MOGODB_MONITOR