Feature Request: pg_stat_activity.client_hostname and Unix sockets

This predicate is, I think, comprehensive, but it seems fragile, since new
state and backend_type values could be added.

( client_hostname IS NULL
AND state IS NOT NULL
AND backend_type IN ( 'client backend'
, 'parallel worker'
, 'autovacuum launcher'
, 'autovacuum worker')
)

Thus, client_hostname set to "unix" or "socket" on such local connections
would be handy.

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