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Fixes #37

Adds mirror monitoring query

See merge request !60

Add label describing if namespace is ower shared runners limits created, pending and running jobs metrics

See merge request !54

Cleanup database probes

See merge request !57

Update database rows_count metric name to follow Promtheus style
guide[0].

[0]: https://prometheus.io/docs/practices/naming/#metric-names

Remove obsolete database probes that have been moved to the
`postgres_exporter`.
* `blocked_queries`
* `slow_queries:`
* `stuck_idle_in_transactions`
* `vacuum_queries`

Remove unneeded row counts

See merge request !55

Fix broken query

Closes #29

See merge request !56

Improve CI metrics

See merge request !53

Merge branch '25-cibuildscollector-per_runner_query-assumes-mirror-features-not-available-in-ce' into 'master'

Resolve "CiBuildsCollector::PER_RUNNER_QUERY assumes mirror features not available in CE"

Closes #25

See merge request !52

In the previous commit we're using a wildcard to select all columns,
now by using PGs information_schema we query if the column exits.