This is an improvement request (opening as spin off of https://perconadev.atlassian.net/browse/PMM-11406 ).

For MongoS the state printed inside the chart is ‘UNKNOWN’ or can be ‘STARTUP’ as well. This appears confusing. Probably UP and DOWN can be considered instead (or something else, if that makes more sense). For the other node types, e.g. shard or config, things work correctly - PRIMARY, SECONDARY, ARBITER is printed. This affects only MongoS nodes.

Thank you.