Hi.

The "PostgreSQL by Zabbix agent 2" template has the following element:

Key: pgsql.replication.count 
Name: Replication: Standby count
Description: Number of standby servers

https://www.zabbix.com/integrations/postgresql#postgresql_agent2

The pgsql.replication.count key, which executes the query in the database:

query = `SELECT COUNT(DISTINCT client_addr) + COALESCE(SUM(CASE WHEN client_addr IS NULL THEN 1 ELSE 0 END), 0) FROM pg_stat_replication;`

https://git.zabbix.com/projects/AP/repos/postgresql/browse/plugin/handler_replication.go#117

However, this query counts not only the number of physical standbys, but in general all types of replications, incl. logical replications.

In my opinion, the name of the "Standby count" element in the template is incorrect.

Or if we want to show only physical standbys, then we need to change the current key pgsql.replication.count by adding a condition that will exclude logical replications (for example, join with the pg_replication_slots table and exclude slot_type = logical)