remove pg_settings checksum feature. drop old PG versions (#476)

* fix: remove pg_settings checksum feature

* chore: add changelog file

* Apply suggestions from code review

Co-authored-by: Douglas J Hunley <doug.hunley@gmail.com>

* chore: adjust minimum version of pgmonitor-exporter required

---------

Co-authored-by: Douglas J Hunley <doug.hunley@gmail.com>

Author: keithf4

changelogs/fragments/467.yml

@@ -0,0 +1,9 @@
+---
+breaking_changes:
+  - sql_exporter - Dropped support for PostgreSQL 11 and 12
+
+minor_changes:
+  - sql_exporter - Consolidated setup file from different PostgreSQL versions to a single common file
+
+bugfixes:
+  - sql_exporter - Removed the pg_settings_checksum metric since it was not working properly. Requires new version of pgmonitor-extension.

hugo/content/exporter/_index.md

@@ -554,7 +554,7 @@ The files contained in this repository are assumed to be installed in the follow
 
 | pgMonitor Configuration File | System Location |
 |------------------------------|-----------------|
-| postgres_exporter/common/pg##/setup.sql | /etc/postgres_exporter/##/setup.sql  |
+| postgres_exporter/common/setup.sql | /etc/postgres_exporter/##/setup.sql  |
 | postgres_exporter/common/pg##/queries*.yml | /etc/postgres_exporter/##/queries*.yml  |
 | postgres_exporter/common/queries*.yml | /etc/postgres_exporter/##/queries*.yml  |
 | postgres_exporter/linux/crontab.txt | /etc/postgres_exporter/##/crontab.txt  |