Official template for PostgreSQL agent 2:

url: https://www.zabbix.com/integrations/postgresql#tab:official2

url: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/db/postgresql_agent2

Error 1: Wrong item preprocessing used in item "Dbstat: Blocks write time". Should be $.blk_write_time instead of $.blk_read_time

Error 2: Wrong item name for "Disk blocks read per second". See below... two the same item names, but second item name should be "Disk blocks write per second"

3) Error in "Replication Discovery" LLD macro name. Plugin return {#APPLICATION_NAME}, template uses {#APPLICATION}. Template should use {#APPLICATION_NAME} instead of {#APPLICATION}, because replication discovery failing

Plugin source line 37: https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/src/go/plugins/postgres/handler_replication_process_name_discovery.go

json_build_object('data',json_agg(json_build_object('{#APPLICATION_NAME}',CONCAT(application_name, ' ', pid))))

4) If there is no replication configured in PG, "Replication discovery" throwing error., because key pgsql.replication.process.discovery return JSON like:

{"data" : null}

Steps to reproduce:**

1. Apply template to host with PG without replication.

2. Run "Replication discovery" observe errors.

Expected: Just no errors.

I suggest to add preprocessing to not get errors:
"Does not match regular expression" = null, Custom on fail = Discard value.
Something like: