What is Prometheus?

Prometheus is a powerful, open-source monitoring system that collects metrics from services and stores them in a time-series database. It records real-time metrics and alerts. It is written in Go Language. It allows powerful queries and great visualization. Prometheus works very well with Grafana when it comes to Dashboards and alerting notifications.

Prometheus includes a Flexible query language. Every time series contains a metrics name and set of key-value pairs called labels.

# Notation of time series
<metric name> {<label name>=<label value>,.....} 
# Example
node_boot_time {instance="localhost:9000",job="node_exporter"}

Prometheus Architecture