Running psql commands from a remote location & pg_hba.conf?

I have a monitor user that does a SSH from a remote location onto a database's host then runs commands of the form:

/usr/bin/psql -c "SELECT COUNT(*) FROM pg_stat_activity; ;" -U monitor -d db1 -q -A -t

The current pg_hba.conf is

# IPv4 local connections:
host all all 123.0.0.1/32 trust
which is far from ideal!

Am I right to presume that I have to change pg_hba.conf to

host db1 monitor 123.0.0.1/32 trust
host db1 user1 123.0.0.1/32 ident
host db1 user2 123.0.0.1/32 ident

then continue this format with individual entries for all the users in db1?

Or is there a 'better' way of running psql commands from a remote location?

Thanks

Austen

Austen Birchall  Senior Database Administrator, Met Office