Intro to Dropwizard Metrics

https://www.baeldung.com/dropwizard-metrics

Q: What's Dropwizard?
A:

1. Purples: develop RESTful web service
2. Main libraries: Jetty, Jersey, Jackson, JUnit, and Guava. Furthermore, it uses its own library called Metrics.

MetricRegistry: register metric
Metric types: Meter, Gauge, Counter, Histogram and Timer Reporter: output metric