This project is for me to play around with some metrics tools like OpenTSDB, Graphite, Grafana, etc. It's a simple little app that emits some different kinds of metrics that can be visualized so that I can compare how the different metrics tools work.
The app is just a silly little demo that models cars driving on a road while cows cross it. If a car and a cow ever intersect, it's a hit. When a car or a cow completes its traversal, it escapes. Both cars and cows are colored. Metrics are emitted for hits and escapes and tagged with what "kind" and "color" of thing did it.
To add another tool stack that runs locally, add a bin/start-<stack>-stack.sh script and a metric-stacks/<stack name>/stack.yml which is the docker-compose file for running it. Any supporting files for the new stack should go into that directory alongside stack.yml.
Listening ports are different from the defaults because they would collide with each other or with other instances of these services that I might be running. In general, to add a new service, add 1 to the tens position of the port. For instance, the first two Grafana services are on ports 3010 and 3020 instead of the default of 3000.
Use ./gradlew run to start the app. It logs each event that creates
a metric. See the bin directory for scripts to start some local
metrics tools, or set up an appropriate SaaS metrics tool, which you
can add by adding an appropriate dependency and configuring it in
application.properties.