Provide an option to export multiple pgbouncer instances with one exporter instance

[garima-trivedi]

We have a requirement to use Prometheus-community exporter but would like to run only one exporter instance instead of an exporter per PgBouncer instance. I can see the following PR has already been opened in this direction. https://github.com/prometheus-community/pgbouncer_exporter/pull/182

Please expedite the review and merge process for this PR. Or Please provide support for this feature.

[gabrielxfs]

+1 on this feature request

[SuperQ]

There is https://github.com/prometheus-community/pgbouncer_exporter/pull/198, but the implementation needs work.

I recommend looking at https://github.com/prometheus-community/postgres_exporter/pull/618 as the basis for an implementation.