livelessons-operations-metrics

Lesson 3: Creating Operations-Friendly Microservices (Metrics)

Introduction

This sample shows how you can use and extend the Spring Boot Actuator Metrics system.

Building and running the sample

Use the following commands to build run the application:

$ mvn clean package
$ java -jar target/livelessons-operations-metrics-1.0.0-SNAPSHOT.jar

Understanding the code

Logging metrics

Several metrics are automatically logged out of the box, however, it is also possible to log your own values. The ExampleService shows how to call the CounterService and the GaugeService.

Custom PublicMetrics

The PublicMetrics interface allows you to expose information from any source to the metrics system. The ExamplePublicMetrics provides an example.

Rich metrics

My default, metrics are recorded in an InMemory repository and simply exposed by the service. If you also want to keep maximum, minimum and average values you can use a InMemoryRichGaugeRepository @Primary bean. Uncomment the code in OperationsMetricsApplication for an example.