Link how to monitor SQL logs in production

This came out of documentation added in the runbooks:

1. https://gitlab.com/gitlab-com/runbooks/-/merge_requests/3361
2. https://gitlab.com/gitlab-com/runbooks/-/merge_requests/3365

doc/development/sql.md

@@ -367,3 +367,12 @@ retries if it were to fail because of an
 
 To be able to use this method, make sure the model you want to use
 this on inherits from `ApplicationRecord`.
+
+## Monitor SQL queries in production
+
+GitLab team members can monitor slow or canceled queries on GitLab.com
+using the PostgreSQL logs, which are indexed in Elasticsearch and
+searchable using Kibana.
+
+See [the runbook](https://gitlab.com/gitlab-com/runbooks/-/blob/master/docs/patroni/pg_collect_query_data.md#searching-postgresql-logs-with-kibanaelasticsearch)
+for more details.