3.4 MongoDB cluster upgrade to 3.6 and 4.0

Ops and Admin Installation & Upgrades
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4

Re @Stennie_X

I’ve upgrade my rs to 4.0 version.

The arbiter have the previous version only until 3.6 version.
In 4.0 version, my arbiter have the current FCV

rs01:ARBITER> db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )
{ "featureCompatibilityVersion" : { "version" : "4.0" }, "ok" : 1 }

Besides rs.status and service status, are there any other ways to monitor the health of our cluster / rs?

Thanks