1. Start PMM server

2. Add PG instance with PMM client from this FB

3. Go to Explore in PMM server

4. Select there PostgreSQL

5. Select Format as Table and Edit SQL

6. Use this SQL query to get postgres_exporter agent ID: SELECT agent_id FROM agents WHERE agent_type = 'postgres_exporter' AND pmm_agent_id != 'pmm-server';

7. Go to the pmm client host

8. Use ps aux | grep postgres_exporter to find the process

9. Check on what port exporter serves (example: -web.listen-address=127.0.0.1:42003)

10. Make request `curl -v -u pmm:<agent id> localhost:42003/metrics?collect[]=custom_query.mr`

11. Check that you don’t have metrics in the response that starts with pg_stat_user_tables and pg_statio_user_tables prefixes

12. Make request `curl -v -u pmm:<agent id> localhost:42003/metrics?collect[]=custom_query.lr`

13. Check that metrics with such prefixes are presented
    
    

If problematic in QA lets plan another v2 patch release (v3 merging withdrawal)