Dependency the toolkit, such as using maven or gradle

Dependency the toolkit, such as using maven or gradle

   <dependency>
      <groupId>org.apache.skywalking</groupId>
      <artifactId>apm-toolkit-micrometer-registry</artifactId>
      <version>${skywalking.version}</version>
   </dependency>

Using org.apache.skywalking.apm.meter.micrometer.SkywalkingMeterRegistry as the registry, it could forward the MicroMeter collected metrics to OAP server.

import org.apache.skywalking.apm.meter.micrometer.SkywalkingMeterRegistry;

SkywalkingMeterRegistry registry = new SkywalkingMeterRegistry();

// If you has some counter want to rate by agent side
SkywalkingConfig config = new SkywalkingConfig(Arrays.asList("test_rate_counter"));
new SkywalkingMeterRegistry(config);

// Also you could using composite registry to combine multiple meter registry, such as collect to Skywalking and prometheus
CompositeMeterRegistry compositeRegistry = new CompositeMeterRegistry();
compositeRegistry.add(new PrometheusMeterRegistry(PrometheusConfig.DEFAULT));
compositeRegistry.add(new SkywalkingMeterRegistry());

Using snake case as the naming convention. Such as test.meter will be send to test_meter.
Using Millisecond as the time unit.
Adapt micrometer data convention.

Micrometer data type	Transform to meter name	Skywalking data type	Description
Counter	Counter name	Counter	Same with counter
Gauges	Gauges name	Gauges	Same with gauges
Timer	Timer name + “_count”	Counter	Execute finished count
	Timer name + “_sum”	Counter	Total execute finished duration
	Timer name + “_max”	Gauges	Max duration of execute finished time
	Timer name + “_histogram”	Histogram	Histogram of execute finished duration
LongTaskTimer	Timer name + “_active_count”	Gauges	Executing task count
	Timer name + “_duration_sum”	Counter	All of executing task sum duration
	Timer name + “_max”	Counter	Current longest running task execute duration
Function Timer	Timer name + “_count”	Gauges	Execute finished timer count
	Timer name + “_sum”	Gauges	Execute finished timer total duration
Function Counter	Counter name	Counter	Custom counter value
Distribution summary	Summary name + “_count”	Counter	Total record count
	Summary name + “_sum”	Counter	Total record amount sum
	Summary name + “_max”	Gauges	Max record amount
	Summary name + “_histogram”	Gauges	Histogram of the amount

Not Adapt data convention.

Micrometer data type	Data type
LongTaskTimer	Histogram

skywalking-java