influxdb
InfluxDB is an open-source time series database developed by InfluxData. It is written in Go and optimized for fast, high-availability storage and retrieval of time series data in fields such as operations monitoring, application metrics, Internet of Things sensor data, and real-time analytics.
Advanced PostgreSQL monitoring using Telegraf, InfluxDB, Grafana
Introduction This post will go through my experience with setting up some advanced monitoring for PostgreSQL database using Telegraf, InfluxDB, and Grafana (also known as the TIG stack), the problems I faced, and what I ended up doing at the end. What do I mean by advanced? I liked this

Telegraf: dynamically adding custom tags
Adding a custom tag to data coming in from an input plugin for telegraf