Ignore MiddleOnly flag for now

Not all of the authorities are voting on the MiddleOnly flag which is
causing noise on the consensus-health mailing list. Moreover, it's not
clear at this point that reporting differences in MiddleOnly assignment
is useful.

Closes: #40035.

consensus_health_checker.py

@@ -678,8 +678,9 @@ def has_similar_flag_counts(latest_consensus, consensuses, votes):
       #   * BadExit and StaleDesc is only voted on by a few authorities.
       #   * Running isn't voted on when an authority first starts up.
       #   * moria1 likes to experiment with the HSDir flag.
+      #   * MiddleOnly is not voted on by all of the authorities.
 
-      if flag in ('BadExit', 'Running', 'HSDir', 'StaleDesc'):
+      if flag in ('BadExit', 'Running', 'HSDir', 'StaleDesc', 'MiddleOnly'):
         continue
 
       vote_count = authority_flag_count.get(flag, 0)