The Prometheus Utility Tool is used by the Prometheus project to build other components.

Provides a simple reverse proxy for Prometheus exporters. It is
intended as a single binary alternative to nginx/Apache for use in
environments where opening multiple TCP ports to all servers might be
difficult.

A graph and dashboard builder for visualizing time series metrics.

Grafana provides ways to create, explore, and share
dashboards and data with teams.

The blackbox exporter allows blackbox probing of endpoints over
HTTP, HTTPS, DNS, TCP and ICMP.