Confirming the replica set status

First of all, you can immediately distinguish the primary from a secondary from the mongo shell prompt. Otherwise, you can use the rs.status() command to determine how well (or badly!) the replica set is performing:

The rs.status() command includes some interesting sub-documents, including details on the election process, as captured here:

"electionCandidateMetrics" : {
        "lastElectionReason" : "electionTimeout",
        "lastElectionDate" : ISODate("2020-03-25T04:40:47.469Z"),
        "electionTerm" : NumberLong(1),
        ...
        "newTermStartDate" : ISODate("2020-03-25T04:40:48.014Z"),
        "wMajorityWriteAvailabilityDate" : ISODate("2020-03-25T04:40:48.860Z")
    },

You can also see detailed information on the members of the replica set. In this code block, you can see the details for the member1 server, which also happens...