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Adds prometheus metrics endpoint (#24)
* Adds prometheus metrics endpoint * Adds some metrics using dropwizard tools * Make metricsregistry to not be singleton * Private final jettyServer
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,4 +1,5 @@ | ||
| target/** | ||
| rpm/target/** | ||
| .idea/** | ||
| dependency-reduced-pom.xml | ||
| var/ |
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| @@ -0,0 +1,95 @@ | ||
| /* | ||
| Kubernetes log forwarder k8s_01 | ||
| Copyright (C) 2023 Suomen Kanuuna Oy | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package com.teragrep.k8s_01; | ||
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| import com.codahale.metrics.*; | ||
| import com.codahale.metrics.jmx.JmxReporter; | ||
| import com.codahale.metrics.jvm.*; | ||
| import io.prometheus.client.CollectorRegistry; | ||
| import io.prometheus.client.dropwizard.DropwizardExports; | ||
| import io.prometheus.client.exporter.MetricsServlet; | ||
| import io.prometheus.client.hotspot.DefaultExports; | ||
| import org.eclipse.jetty.server.Server; | ||
| import org.eclipse.jetty.servlet.ServletContextHandler; | ||
| import org.eclipse.jetty.servlet.ServletHolder; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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|
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| import static com.codahale.metrics.MetricRegistry.name; | ||
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| public class PrometheusMetrics { | ||
| private static final Logger LOGGER = LoggerFactory.getLogger(PrometheusMetrics.class); | ||
| private final Server jettyServer; | ||
| public PrometheusMetrics(int port) { | ||
| LOGGER.info("Starting prometheus metrics server on port {}", port); | ||
| // prometheus-exporter | ||
| jettyServer = new Server(port); | ||
| ServletContextHandler context = new ServletContextHandler(); | ||
| context.setContextPath("/"); | ||
| jettyServer.setHandler(context); | ||
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| MetricsServlet metricsServlet = new MetricsServlet(); | ||
| ServletHolder servletHolder = new ServletHolder(metricsServlet); | ||
| context.addServlet(servletHolder, "/metrics"); | ||
| setupDropWizard(); | ||
| // Add metrics about CPU, JVM memory etc. | ||
| DefaultExports.initialize(); | ||
| // Start the webserver. | ||
| try { | ||
| jettyServer.start(); | ||
| } catch (Exception e) { | ||
| throw new RuntimeException(e); | ||
| } | ||
| } | ||
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| static void setupDropWizard() { | ||
| MetricRegistry metricRegistry = new MetricRegistry(); | ||
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| // Totals | ||
| metricRegistry.register(name("total", "reconnects"), new Counter()); | ||
| metricRegistry.register(name("total", "connections"), new Counter()); | ||
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| // Throughput meters | ||
| metricRegistry.register(name("throughput", "bytes"), new Meter(new SlidingTimeWindowMovingAverages())); | ||
| metricRegistry.register(name("throughput", "records"), new Meter(new SlidingTimeWindowMovingAverages())); | ||
| metricRegistry.register(name("throughput", "errors"), new Meter(new SlidingTimeWindowMovingAverages())); | ||
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| // Misc | ||
| metricRegistry.register(name("jvm", "vm"), new JvmAttributeGaugeSet()); | ||
| metricRegistry.register(name("jvm", "memory"), new MemoryUsageGaugeSet()); | ||
| metricRegistry.register(name("jvm", "threads"), new ThreadStatesGaugeSet()); | ||
| metricRegistry.register(name("jvm", "gc"), new GarbageCollectorMetricSet()); | ||
| SharedMetricRegistries.add("default", metricRegistry); | ||
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| // Add to Prometheus metrics | ||
| CollectorRegistry.defaultRegistry.register(new DropwizardExports(metricRegistry)); | ||
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| // Enable JMX listener | ||
| JmxReporter jmxReporter = JmxReporter.forRegistry(metricRegistry).build(); | ||
| jmxReporter.start(); | ||
| } | ||
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| public void close() { | ||
| LOGGER.info("Closing prometheus metrics server"); | ||
| try { | ||
| jettyServer.stop(); | ||
| } catch (Exception e) { | ||
| LOGGER.error("Failed to stop jettyServer:", e); | ||
| } | ||
| } | ||
| } |
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