Grafana dashboard: Postgres Overview
Description: Performance metrics for Postgres

Dashboard allow to monitor:
 - rows fetched/returned/inserted/updated/deleted per second
- total qps based on commits and rollbacks
- buffers state
- deadlocks and conflicts graph
- cache hit ratio graph
- number of active connections

The author assumes that the metrics are scraped from various hosts and databases. That's why there are placed two templates: $host and $db. Graphs would change accordingly to selected value.

Requirements: 
Dashboard is based on the https://github.com/wrouesnel/postgres_exporter metrics



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