It took me a while to make monitoring with metricbeat working again after the upgrade from 7.17.4 to 8.2.2 (I had to manually delete old .monitoring* indices).
Anyway, as soon as monitoring started working in Kibana, all 6 nodes of my cluster are marked as master (starred). In this cluster, all nodes can be master (all carry data).
There was a similar issue before:
Maybe a regression?
Same for me, mostly just commenting to follow
The linked issue has a label "v8.3.0", so I assume it will be released with that version.
Upgraded to ES 8.3.1 the issue is gone.
Nice work, folks! 
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