This moves the metrics that are queried from pg_stat_bgwriter into a dedicated collector instead of dynamically generating queries and metrics from a map. It renames some metrics including adding the `_total` suffix on all of the counters to match prometheus standards. This implementation uses QueryRowContext to allow for later addition of context for cancellation. From the Postgres documentation, it states that there is one line per WAL sender process, but it is unclear how to differentiate between them in any meaningful way. When querying the table, there is no column to identify the row, only metrics about bgwriter.
Signed-off-by: Joe Adams <github@joeadams.io>
Converts the pg_database metrics from queries.yaml to a built in collector. This is enabled by default because it is not likely to be a performance problem and likely very useful data.
Signed-off-by: Joe Adams <github@joeadams.io>
* Add CHANGELOG from existing tags.
First release under the Prometheus Community organisation.
* [CHANGE] Update build to use standard Prometheus promu/Dockerfile
* [ENHANCEMENT] Remove duplicate column in queries.yml #433
* [ENHANCEMENT] Add query for 'pg_replication_slots' #465
* [ENHANCEMENT] Allow a custom prefix for metric namespace #387
* [ENHANCEMENT] Improve PostgreSQL replication lag detection #395
* [ENHANCEMENT] Support connstring syntax when discovering databases #473
* [ENHANCEMENT] Detect SIReadLock locks in the pg_locks metric #421
* [BUGFIX] Fix pg_database_size_bytes metric in queries.yaml #357
* [BUGFIX] Don't ignore errors in parseUserQueries #362
* [BUGFIX] Fix queries.yaml for AWS RDS #370
* [BUGFIX] Recover when connection cannot be established at startup #415
* [BUGFIX] Don't retry if an error occurs #426
* [BUGFIX] Do not panic on incorrect env #457
Signed-off-by: Ben Kochie <superq@gmail.com>
Joe Adams
SuperQ