Path to PgBouncer pid file. If provided, the standard process metrics get exported for the PgBouncer process, prefixed with ‘pgbouncer_process_…’. The pgbouncer_process exporter needs to have read access to files owned by the PgBouncer process. Depends on the availability of /proc. https://prometheus.io/docs/instrumenting/writing_clientlibs/#process-metrics.

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