MongoDB replication Status 6 critical
MongoDB Replication set member as seen from another member of the set, is not yet known
>>>
== 6
The PromQL mongodb_replset_member_state == 6 returns a series for any replica‑set member whose reported state value is 6, which corresponds to the UNKNOWN state. The alert triggers as soon as any member is seen as UNKNOWN by another member, meaning its status cannot be determined (e.g., it is unreachable or not yet recognized).
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