Time series metrics reporting and alerting and an essential tool when it comes to monitoring production services. Graphs help you monitor trends over time, identify spikes in load / latency, identify bottlenecks with constrained resources, etc. [Dropwizard Metrics](https://metrics.dropwizard.io/4.0.0/) is a great library for collecting metrics and has a lot of features out of the box including various [JVM metrics](/posts/monitoring-your-jvm-with-dropwizard-metrics). There are also many third party library hooks for collections metrics on HikariCP connections pools, Redis client connections, HTTP client connections, and many more.
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