mwiede

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Proxy;

import io.github.resilience4j.retry.Retry;

public final class WebserviceFactory{

    static <T> T decorateWithRetryer(final T service, Retry retry) {

        InvocationHandler invocationHandler = (proxy, method, args) -> retry.executeCheckedSupplier(() -> method.invoke(service, args));

mwiede

@Timed
@Metered
@ExceptionMetered
interface GitHub {
    @RequestLine("GET /repos/{owner}/{repo}/contributors")
    List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
}

static class Contributor {
    String login;

mwiede

@Path("/example")
@Produces(MediaType.TEXT_PLAIN)
public class ExampleResource {
    @GET
    @Timed
    @Metered
    @ExceptionMetered
    public String show() {
        return "yay";
    }

mwiede

-- Gauges ----------------------------------------------------------------------
org.apache.http.conn.HttpClientConnectionManager.available-connections
             value = 1
org.apache.http.conn.HttpClientConnectionManager.leased-connections
             value = 0
org.apache.http.conn.HttpClientConnectionManager.max-connections
             value = 20
org.apache.http.conn.HttpClientConnectionManager.pending-connections
             value = 0

mwiede

-- Gauges ----------------------------------------------------------------------
okhttp3.OkHttpClient.connection-pool-idle-count
             value = 1
okhttp3.OkHttpClient.connection-pool-total-count
             value = 1

-- Counters --------------------------------------------------------------------
okhttp3.OkHttpClient.network-requests-running
             count = 0

mwiede

MetricRegistry metricRegistry = new MetricRegistry();

final ConsoleReporter reporter = ConsoleReporter.forRegistry(metricRegistry).convertRatesTo(TimeUnit.SECONDS)
        .convertDurationsTo(TimeUnit.MILLISECONDS).build();

GitHub github = Feign.builder().invocationHandlerFactory(
        // instrument feign
        new FeignOutboundMetricsDecorator(new InvocationHandlerFactory.Default(), metricRegistry)).client(
        // setting an instrumented httpclient
        new ApacheHttpClient(InstrumentedHttpClients

mwiede

  MetricRegistry metricRegistry = new MetricRegistry();

  final ConsoleReporter reporter = ConsoleReporter.forRegistry(metricRegistry).convertRatesTo(TimeUnit.SECONDS)
          .convertDurationsTo(TimeUnit.MILLISECONDS).build();

  GitHub github = Feign.builder().invocationHandlerFactory(
          // instrumenting feign
          new FeignOutboundMetricsDecorator(new InvocationHandlerFactory.Default(), metricRegistry))
          // instrumenting ok http
          .client(new OkHttpClient(InstrumentedOkHttpClients.create(metricRegistry)))          

mwiede

scrape_configs:
  - job_name:       'jaxrs'
    metrics_path: /prometheusMetrics/

    # Override the global default and scrape targets from this job every 5 seconds.
    scrape_interval: 5s

    static_configs:
      - targets: ['www.example.com:80']
        

mwiede

<dependency>
  <groupId>io.astefanutti.metrics.cdi</groupId>
  <artifactId>metrics-cdi</artifactId>
  <version>1.3.6</version>
</dependency>
<dependency>
  <groupId>io.prometheus</groupId>
  <artifactId>simpleclient</artifactId>
  <version>0.0.23</version>
</dependency>

mwiede

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <welcome-file-list>
    <welcome-file>/index.html</welcome-file>
  </welcome-file-list>
  
  <!-- -->
   
   <servlet>
        <servlet-name>prometheusMetrics</servlet-name>