Application to DB Monitoring Part 1 - Postgres

Hi folks!
We have finished implementing Application to PostgreSQL monitoring.
It monitors the latency and the number of calls to each distinct stored procedure, every one minute.

For more information on how to enable the monitoring, please refer to https://29022131.atlassian.net/wiki/display/ENG/How+to+Enable+Application+to+PostgreSQL+Stored+Procedure+Monitoring.

Note: Please inform site-infra about the estimated increase of the number of metrics before you enable the monitoring.

We have also made a Grafana dashboard template that visualizes the metrics monitored here. The template can be found at https://29022131.atlassian.net/wiki/display/ENG/Grafana+Dashboard+Applicaton+to+DB+Template.

Thanks!