[JimStavr]

We are using pg_stat_wal and pg_stat_io metrics by generating the stats manually via cronjob that executes a python script every minute in our Postgres VM, and shipped to prometheus via node exporter's textfile collector.

Since they are super useful on our prod postgres monitoring i took the initiative to add them as collectors in this exporter so they can be included in a future release if they are considered useful from the community.

Collectors added:

• stat_io disabled by default as it can cause high cardinality, so i let the user decide to enable it or not
• stat_wal enabled by default

I am not so familiar with this exporter, so thank you for your time and let me know for comments after reviewing.

[yoav-katz]

I would love to see this merge!
We are looking for a way to see wal generation rate