Support for sql_exporter with pgMonitor extension (#361)

* initial commit of sql_exporter using pgmonitor extension

* Fix table size metric name in grafana dashboard

* fix: change sql_exporter service file to template

* fix: add missing key in bgw struct. fix pg_stat_statements column

* feat: add further support of backrest and bouncer in sql_exporter. better define new extras package

* doc: update README files for sql_exporter and pgmonitor extension

* fix: fix name of pgbouncer collector

* chore: update sql_exporter service file

* chore: update sql_exporter service file

* chore: move pgmonitor extension to its own repository

* feat: add pgmonitor-extension metrics. add pgbouncer direct collection.

* docs: update build file. clarify access to rpms via portal

* update documentation

* fix: fix the source for alertmanager sysconfig file to be our provided file

* chore: explicitly list grafana dashboards in build manifest

* chore: remove old sql_exporter readme file

* chore: add changelog fragment

* chore: add changelog fragment

* Apply suggestions from code review

Co-authored-by: Douglas J Hunley <[email protected]>

* fix: remove top level overview dashboard

* fix: remove top level overview dashboard

* fix: update grafana dashboards for angular deprecation

* Apply suggestions from code review

Co-authored-by: Douglas J Hunley <[email protected]>

* docs: update docs based on recommendations

* Apply suggestions from code review

Co-authored-by: Douglas J Hunley <[email protected]>

* fix: update version requirements for grafana

---------

Co-authored-by: Douglas J Hunley <[email protected]>

changelogs/fragments/361.yml

@@ -0,0 +1,10 @@
+major_changes:
+  - sql_exporter - Add support for new PostgreSQL metrics collecting exporter: sql_exporter
+  - sql_exporter - Add support for directly connecting to PgBouncer to collect metrics
+  - pgmonitor-extension - Add support for using the PostgreSQL pgmonitor-extension to aid in metrics collection with sql_exporter
+  - pgmonitor-extension - Add more extensive support for materialized views and refreshed tables for expensive or custom metric queries
+  - postgres_exporter - Note that postgres_exporter is still supported but will be deprecated in a future version
+  - grafana - New Grafana minimum version is now 10.4. All dashboards have been updated to fix AngularJS deprecation warnings and re-exported from 10.4.
+  - grafana - Add new dashboards for sql_exporter support. New PostgreSQL Overview and PgBouncer direct metrics dashboards
+  - grafana - Organize packages to allow better choice of available Grafana dashboards 
+  - grafana - Remove top level general Overview dashboard