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UserGuide and example extended for Micrometer integration (#5427)
Signed-off-by: Maxim Nesen <[email protected]>
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| <?xml version="1.0" encoding="UTF-8"?> | ||
| <!-- | ||
| Copyright (c) 2023 Oracle and/or its affiliates. All rights reserved. | ||
| This program and the accompanying materials are made available under the | ||
| terms of the Eclipse Public License v. 2.0, which is available at | ||
| http://www.eclipse.org/legal/epl-2.0. | ||
| This Source Code may also be made available under the following Secondary | ||
| Licenses when the conditions for such availability set forth in the | ||
| Eclipse Public License v. 2.0 are satisfied: GNU General Public License, | ||
| version 2 with the GNU Classpath Exception, which is available at | ||
| https://www.gnu.org/software/classpath/license.html. | ||
| SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 | ||
| --> | ||
|
|
||
| <!DOCTYPE chapter [<!ENTITY % ents SYSTEM "jersey.ent" > %ents; ]> | ||
| <chapter xmlns="http://docbook.org/ns/docbook" | ||
| version="5.0" | ||
| xml:lang="en" | ||
| xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
| xmlns:xi="http://www.w3.org/2001/XInclude" | ||
| xmlns:xlink="http://www.w3.org/1999/xlink" | ||
| xsi:schemaLocation="http://docbook.org/ns/docbook http://docbook.org/xml/5.0/xsd/docbook.xsd | ||
| http://www.w3.org/1999/xlink http://www.w3.org/1999/xlink.xsd" | ||
| xml:id="jersey-micrometer"> | ||
| <title>Micrometer - application observability facade</title> | ||
| <para> | ||
| The chapter is about Micrometer integration into Jersey which comes since the version 2.41 as an extension module. | ||
| Before Jersey 2.41, it was possible to integrate Micrometer with Jersey using directly µmeter.jersey.link;. | ||
| There is also support for Jakarta EE 10 integration. The detailed documentation regarding metrics fine-tuning | ||
| can be found at the µmeter.link;. | ||
| </para> | ||
| <section xml:id="micrometer-integration"> | ||
| <title>Integration into Jersey</title> | ||
| <para> | ||
| Since Jersey 2.41 it's possibly to use an extension module in order to use Micrometer instrumentation | ||
| inside your projects. The module shall be added as a dependency: | ||
| <programlisting language="xml" linenumbering="unnumbered"><dependency> | ||
| <groupId>org.glassfish.jersey.ext.micrometer</groupId> | ||
| <artifactId>jersey-micrometer</artifactId> | ||
| <version>&version;</scope> | ||
| </dependency></programlisting> | ||
| After the dependency is added, the Micrometer can be configured as follows: | ||
| <programlisting language="java" linenumbering="unnumbered">final ResourceConfig resourceConfig = new ResourceConfig(); | ||
| resourceConfig.register(new MetricsApplicationEventListener( | ||
| registry, | ||
| new DefaultJerseyTagsProvider(), "http.shared.metrics", true)); | ||
| final ServletContainer servletContainer = new ServletContainer(resourceConfig);</programlisting> | ||
| the registry instance is of type <literal>MeterRegistry</literal> which could be | ||
| <literal>new SimpleMeterRegistry();</literal>. Then all metrics can be accessed like | ||
| <literal>registry.get("http.shared.metrics")</literal>. The "http.shared.metrics" string | ||
| is the name of a particular registry which was registered within the | ||
| <literal>MetricsApplicationEventListener</literal>. | ||
|
|
||
| Micrometer supports a set of <literal>Meter</literal> primitives, including <literal>Timer</literal>, | ||
| <literal>Counter</literal>, <literal>Gauge</literal>, <literal>DistributionSummary</literal>, | ||
| <literal>LongTaskTimer</literal>, <literal>FunctionCounter</literal>, <literal>FunctionTimer</literal>, | ||
| and <literal>TimeGauge</literal>. | ||
| Different meter types result in a different number of time series metrics. For example, while there is | ||
| a single metric that represents a <literal>Gauge</literal>, a <literal>Timer</literal> measures both the | ||
| count of timed events and the total time of all timed events. | ||
| </para> | ||
| <para> | ||
| Implementing resource methods, which should be measured, several annotations can be used. The basic example | ||
| demonstrates the <literal>@Counted</literal> annotation. | ||
| <example> | ||
| <title>Annotated Micrometer resource methods</title> | ||
| <programlisting language="java" linenumbering="unnumbered">@GET | ||
| @Counted(value = COUNTER_NAME, description = COUNTER_DESCRIPTION) | ||
| @Produces(MediaType.TEXT_PLAIN) | ||
| @Path("counted") | ||
| public String getCounterMessage() { | ||
| return "Requests to this method are counted. Use /metrics to see more"; | ||
| } | ||
| </programlisting> | ||
| </example> | ||
| Metrics however can be introduced using another annotations <literal>@Timed</literal>, or | ||
| <literal>@TimedSet</literal> which is a set of <literal>@Timed</literal>. | ||
| </para> | ||
| </section> | ||
| </chapter> |
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