Introduction

A metrics collection lib for JVM-based apps

• Provides a vendor-neutral API to instrument your app
• Auto-configured via spring-boot-starter-actuator
• Works as a facade, write metrics once and export them to multiple backends
  • Can send metrics to Prometheus, Datadog, InfluxDB, Graphite, …

pom.xml

<dependency>
	<groupId>io.micrometer</groupId>
	<artifactId>micrometer-registry-prometheus</artifactId>
</dependency>

Metric Types

private final MeterRegistry meterRegistry;

Counter (what is happening)

• Only increases, cannot decrease
• Good for: total requests, errors, messages processed

Counter counter = meterRegistry.counter("orders.completed");
counter.increment();  // increment by 1
counter.increment(5); // increment by 5