Merge pull request #6751 from lchapman4/Postgres-Custom-Query-Perms

Added permissions for the custom query file

src/content/docs/infrastructure/host-integrations/host-integrations-list/postgresql/postgresql-integration.mdx

@@ -165,6 +165,17 @@ If you also want to obtain table and index-related metrics (for example, table s
 GRANT SELECT ON ALL TABLES IN SCHEMA public TO new_relic;
 ```
 
+If you also want to obtain query-level metrics from the PostgreSQL custom query config file, the PostgreSQL role used by the integration (`new_relic`)  needs to be added to the (`pg_read_all_stats`) role. This is due to the user leveraging the (`pg_stat_statements`) extension. 
+```
+GRANT pg_read_all_stats TO new_relic;
+```
+
+Enabling the `pg_stat_statements` extension may require you to manually create it from a query prompt:
+
+```
+CREATE EXTENSION pg_stat_statements;
+```
+
 ### postgresql-config.yml sample files [#examples]
 
 <CollapserGroup>