pgantenna is an open source monitoring framework for Postgresql clusters.
The project page provides an overview of the framework.
The project wiki has documentation on running and customizing pgantenna.
The best way to run pgantenna is to launch a docker container based on a publicly available image:
docker run -p 24831:24831 -p 80:80 no0p/pgantenna
You can now direct your postgresql cluster to begin shipping statistics to pgantenna by installing pgsampler and configuring pgsampler to connect the pgantenna host.