Prom Health Checker

Simple Go app that just pings a bunch of sites that you (politely) ask it to

Application Specifics

Port

The app listens on tcp/9090

Endpoints

Endpoint Name	What it does
/healthz	Health check endpoint
/metrics	Exposes the prometheus Metrics

Prometheus metrics

The application exposes 2 useful metrics per monitored app

Endpoint
http_latency_milliseconds
http_up

http_latency_milliseconds

This endpoint responds with the most recent latency in milliseconds for the app to make an http get to the site

http_up

This is a binary operator which tells you if the app is reachable (1) or not (0)

Example

# HELP http_latency_milliseconds Latency of HTTP requests to endpoints
# TYPE http_latency_milliseconds gauge
http_latency_milliseconds{endpoint="breadnet"} 40
http_latency_milliseconds{endpoint="google"} 329
# HELP http_up Whether the HTTP endpoint is up (1) or down (0)
# TYPE http_up gauge
http_up{endpoint="breadnet"} 1
http_up{endpoint="google"} 1

How to run

podman run --rm -v $(pwd)/endpoints.yaml:/app/endpoints.yaml europe-west2-docker.pkg.dev/breadnet-container-store/public/prom-status:latest