Grafana dashboard: PostgreSQL Statistics
Description: Dashboard for PostgreSQL Statistics.

Improvements for [https://grafana.com/grafana/dashboards/6742](https://grafana.com/grafana/dashboards/6742).

Dependencies:
- [postgres_exporter](https://github.com/prometheus-community/postgres_exporter) version 0.11.1

Changes includes:
- support for scraping multiple postgres exporters from a single prometheus instance
- only list databases scraped by a postgres exporter instance
- graph showing database size
 

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