go-app

Instrumented Go application

In this sandbox, a Prometheus intance scrapes metrics from a simple Go web application.

Usage

To start the sandbox:

# In the foreground
make run # docker-compose up --build

# In detached mode
make run-detached # docker-compose up --build --detach

This will start up two services:

Service	Description
prometheus	A Prometheus instance that's configured to scrape metrics from the Go application running on port 2112
myapp	A simple Go web application that pretty much only exports a simple metric (a myapp_processed_ops_total counter that is incremented every 2 seconds)

Once the sandbox is up and running, navigate to http://localhost:9090/graph in your browser and enter myapp_processed_ops_total into the expression bar to see the most up-to-date value of the counter.

You can also see this metrics by "scraping" the Go web server's /metrics endpoint:

curl localhost:2112/metrics | grep myapp_processed_ops_total
# HELP myapp_processed_ops_total The total number of processed events
# TYPE myapp_processed_ops_total counter
myapp_processed_ops_total 4