I have streaming replication wich i need to monitor. So there is a special user for Zabbix. I don't want to use pg_mongz and decided to set my own quieries to pg_catalog schema's view pg_stat_replication to get replication state. When I use query:
select * from pg_stat_replication;
it returns replication state record for admin. But when I loged as monitoring user it returns just: pid, usesysid, usename, application_name. So such parameters as client_addr, client_hostname, client_port, backend_start, state, sent_location, write_location, etc. are empty.
First I granted rights to my user on schema and tables:
grant usage on schema pg_catalog to usrmonitor;
grant select on all tables in schema pg_catalog to usrmonitor;
but it didn't help. When I looked at view I found that query uses functions and granted execution:
grant execute on function pg_stat_get_wal_senders() to usrmonitor;
grant execute on function pg_stat_get_activity(integer) to usrmonitor;
But the select query still returns empty fileds. What maybe the problem?