Hands-On Enterprise Java Microservices with Eclipse MicroProfile

Supplying application-specific metrics

Applications can choose to expose metric data via a CDI programming model. This model was inspired by DropWizard Metrics, so that it is easier to transition applications to MP-Metrics. It also uses the annotations from DropWizard Metrics, which have been augmented to support metadata.

Let’s start with an example by defining a counter that is then incremented in code:

@Inject@Metric(absolute = true, description = "# calls to /health")Counter hCount; // This is the counter@GET@Path("/health")public Response getHealth() throws Exception {    hCount.inc(); // It is increased in the application    [...]}

In this example, we are registering a counter by getting it injected into the hCount variable:

The @Metric