[ADMIN] monitoring queries in pg_stat_activity - Mailing list pgsql-admin

I have created a nosuperuser for monitoring, but I can't do a select on the pg_stat_activity table, I get the follow message:

select datid,xact_start,query  from  pg_catalog.pg_stat_activity;

I have assigned these grants to my user:

GRANT ALL ON SCHEMA pg_catalog to myuser;

GRANT SELECT ON ALL TABLES IN schema pg_catalog TO myuser;

The user not should be a superuser. does there are other way for solve it?

thanks to all