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Add a sample name filter for in-/excluding metrics by name or name prefix (#680)
Signed-off-by: Fabian Stäber <fabian@fstab.de>
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‎README.md‎

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@@ -672,9 +672,14 @@ There are HTTPServer, Servlet, SpringBoot, and Vert.x integrations included in t
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The simplest of these is the HTTPServer:
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```java
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HTTPServer server = new HTTPServer(1234);
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HTTPServer server = new HTTPServer.Builder()
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.withPort(1234)
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.build();
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```
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The `HTTPServer.Builder` supports configuration of a `SampleNameFilter` which can be used to
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restrict the time series being exported by name.
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To add Prometheus exposition to an existing HTTP server using servlets, see the `MetricsServlet`.
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It also serves as a simple example of how to write a custom endpoint.
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context.addServlet(new ServletHolder(new MetricsServlet()), "/metrics");
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```
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Like the HTTPServer, the `MetricsServlet` can be configured with a `SampleNameFilter` which can
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be used to restrict the time series being exported by name. See `integration_tests/servlet_jakarta_exporter_webxml/`
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for an example how to configure this in `web.xml`.
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All HTTP exposition integrations support restricting which time series to return
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using `?name[]=` URL parameters. Due to implementation limitations, this may
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have false negatives.
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## Exporting to a Pushgateway
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The [Pushgateway](https://github.com/prometheus/pushgateway)

‎integration_tests/example_application/pom.xml‎

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@@ -30,7 +30,7 @@
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</dependencies>
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<build>
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<finalName>${artifactId}</finalName>
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<finalName>${project.artifactId}</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>

‎integration_tests/exemplars_otel/pom.xml‎

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@@ -54,7 +54,7 @@
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</dependencies>
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<build>
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<finalName>${artifactId}</finalName>
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<finalName>${project.artifactId}</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>

‎integration_tests/pom.xml‎

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<module>exemplars_otel_agent</module>
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<module>example_application</module>
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<module>java_versions</module>
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<module>servlet_jakarta_exporter_webxml</module>
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</modules>
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<build>

‎integration_tests/servlet_jakarta_exporter_webxml/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>io.prometheus</groupId>
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<artifactId>integration_tests</artifactId>
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<version>0.11.1-SNAPSHOT</version>
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</parent>
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<artifactId>servlet_jakarta_exporter_webxml</artifactId>
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<name>Integration Test - Servlet Jakarta Exporter web.xml</name>
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<packaging>war</packaging>
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<properties>
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<otel.version>1.2.0</otel.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>io.prometheus</groupId>
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<artifactId>simpleclient</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>io.prometheus</groupId>
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<artifactId>simpleclient_servlet_jakarta</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>io.prometheus</groupId>
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<artifactId>simpleclient_hotspot</artifactId>
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<version>${project.version}</version>
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</dependency>
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<dependency>
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<groupId>com.squareup.okhttp3</groupId>
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<artifactId>okhttp</artifactId>
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<version>4.9.1</version>
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</dependency>
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<dependency>
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<groupId>org.testcontainers</groupId>
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<artifactId>testcontainers</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>ch.qos.logback</groupId>
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<artifactId>logback-classic</artifactId>
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<version>1.1.2</version>
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</dependency>
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<dependency>
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<groupId>jakarta.servlet</groupId>
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<artifactId>jakarta.servlet-api</artifactId>
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<version>5.0.0</version>
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<scope>provided</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>${project.artifactId}</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>1.8</source>
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<target>1.8</target>
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-failsafe-plugin</artifactId>
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<executions>
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<execution>
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<id>integration-test</id>
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<phase>integration-test</phase>
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<goals>
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<goal>integration-test</goal>
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</goals>
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</execution>
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<execution>
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<id>verify</id>
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<phase>verify</phase>
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<goals>
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<goal>verify</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-dependency-plugin</artifactId>
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<executions>
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<execution>
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<id>copy-dependencies</id>
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<phase>package</phase>
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<goals>
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<goal>copy-dependencies</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<artifactId>maven-war-plugin</artifactId>
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<version>3.3.1</version>
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</plugin>
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</plugins>
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</build>
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<licenses>
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<license>
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<name>The Apache Software License, Version 2.0</name>
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<url>http://www.apache.org/licenses/LICENSE-2.0.txt</url>
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<distribution>repo</distribution>
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</license>
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</licenses>
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</project>

‎integration_tests/servlet_jakarta_exporter_webxml/src/main/java/io/prometheus/client/it/servlet/jakarta/ExampleServlet.java‎

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package io.prometheus.client.it.servlet.jakarta;
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import io.prometheus.client.hotspot.DefaultExports;
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import jakarta.servlet.http.HttpServlet;
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import jakarta.servlet.http.HttpServletRequest;
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import jakarta.servlet.http.HttpServletResponse;
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import java.io.BufferedWriter;
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import java.io.IOException;
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import java.io.Writer;
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public class ExampleServlet extends HttpServlet {
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@Override
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public void init() {
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DefaultExports.initialize();
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}
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@Override
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protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws IOException {
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resp.setStatus(200);
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resp.setContentType("text/plain");
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Writer writer = new BufferedWriter(resp.getWriter());
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writer.write("Hello, world!\n");
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writer.close();
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}
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}

‎integration_tests/servlet_jakarta_exporter_webxml/src/main/webapp/WEB-INF/web.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<web-app xmlns="https://jakarta.ee/xml/ns/jakartaee"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_5_0.xsd"
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version="5.0">
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<!-- Anyone still using web.xml in 2021? -->
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<servlet>
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<servlet-name>example</servlet-name>
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<servlet-class>io.prometheus.client.it.servlet.jakarta.ExampleServlet</servlet-class>
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<load-on-startup/>
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</servlet>
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<filter>
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<filter-name>prometheus</filter-name>
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<filter-class>io.prometheus.client.servlet.jakarta.filter.MetricsFilter</filter-class>
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<init-param>
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<param-name>metric-name</param-name>
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<param-value>requests</param-value>
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</init-param>
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</filter>
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<servlet>
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<servlet-name>prometheus-exporter</servlet-name>
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<servlet-class>io.prometheus.client.servlet.jakarta.exporter.MetricsServlet</servlet-class>
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<init-param>
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<param-name>name-must-not-start-with</param-name>
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<param-value>
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jvm_threads_deadlocked
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jvm_memory_pool
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</param-value>
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</init-param>
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</servlet>
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<servlet-mapping>
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<servlet-name>example</servlet-name>
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<url-pattern>/*</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>prometheus-exporter</servlet-name>
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<url-pattern>/metrics</url-pattern>
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</servlet-mapping>
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<filter-mapping>
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<filter-name>prometheus</filter-name>
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<servlet-name>example</servlet-name>
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</filter-mapping>
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</web-app>

‎integration_tests/servlet_jakarta_exporter_webxml/src/test/java/io/prometheus/client/it/servlet/jakarta/ServletJakartaExporterWebXmlIT.java‎

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package io.prometheus.client.it.servlet.jakarta;
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import okhttp3.OkHttpClient;
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import okhttp3.Request;
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import okhttp3.Response;
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import org.junit.Assert;
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import org.junit.Rule;
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import org.junit.Test;
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import org.testcontainers.containers.GenericContainer;
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import org.testcontainers.containers.wait.strategy.Wait;
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import org.testcontainers.images.builder.ImageFromDockerfile;
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import java.io.IOException;
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import java.nio.file.Paths;
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import java.util.Arrays;
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import java.util.List;
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public class ServletJakartaExporterWebXmlIT {
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private final OkHttpClient client = new OkHttpClient();
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private static class DockerContainer extends GenericContainer<DockerContainer> {
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DockerContainer() {
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super(new ImageFromDockerfile("servlet-jakarta-exporter-webxml")
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.withFileFromPath("servlet_jakarta_exporter_webxml.war", Paths.get("target/servlet_jakarta_exporter_webxml.war"))
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.withFileFromClasspath("Dockerfile", "Dockerfile"));
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}
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}
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@Rule
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public DockerContainer dockerContainer = new DockerContainer()
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.withExposedPorts(8080)
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.waitingFor(Wait.forLogMessage(".*oejs.Server:main: Started Server.*", 1));
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@Test
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public void testSampleNameFilter() throws IOException, InterruptedException {
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callExampleServlet();
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List<String> metrics = scrapeMetrics();
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assertContains(metrics, "requests_bucket");
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assertContains(metrics, "requests_count");
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assertContains(metrics, "requests_sum");
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assertContains(metrics, "requests_created");
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assertContains(metrics, "requests_status_total");
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assertContains(metrics, "requests_status_created");
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assertContains(metrics, "jvm_gc_collection_seconds_count");
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assertNotContains(metrics, "jvm_threads_deadlocked");
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assertNotContains(metrics, "jvm_memory_pool");
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List<String> filteredMetrics = scrapeMetricsWithNameFilter("requests_count", "requests_sum");
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assertNotContains(filteredMetrics, "requests_bucket");
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assertContains(filteredMetrics, "requests_count");
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assertContains(filteredMetrics, "requests_sum");
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assertNotContains(filteredMetrics, "requests_created");
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assertNotContains(filteredMetrics, "requests_status_total");
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assertNotContains(filteredMetrics, "requests_status_created");
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assertNotContains(filteredMetrics, "jvm_gc_collection_seconds_count");
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assertNotContains(filteredMetrics, "jvm_threads_deadlocked");
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assertNotContains(filteredMetrics, "jvm_memory_pool");
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}
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private void assertContains(List<String> metrics, String prefix) {
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for (String metric : metrics) {
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if (metric.startsWith(prefix)) {
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return;
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}
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}
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Assert.fail("metric not found: " + prefix);
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}
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private void assertNotContains(List<String> metrics, String prefix) {
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for (String metric : metrics) {
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if (metric.startsWith(prefix)) {
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Assert.fail("unexpected metric found: " + metric);
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}
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}
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}
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private void callExampleServlet() throws IOException {
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Request request = new Request.Builder()
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.url("http://localhost:" + dockerContainer.getMappedPort(8080) + "/hello")
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.build();
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try (Response response = client.newCall(request).execute()) {
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Assert.assertEquals("Hello, world!\n", response.body().string());
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}
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}
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private List<String> scrapeMetrics() throws IOException {
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Request request = new Request.Builder()
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.url("http://localhost:" + dockerContainer.getMappedPort(8080) + "/metrics")
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.header("Accept", "application/openmetrics-text; version=1.0.0; charset=utf-8")
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.build();
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try (Response response = client.newCall(request).execute()) {
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return Arrays.asList(response.body().string().split("\\n"));
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}
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}
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private List<String> scrapeMetricsWithNameFilter(String... names) throws IOException {
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StringBuilder param = new StringBuilder();
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boolean first = true;
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for (String name : names) {
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if (!first) {
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param.append("&");
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}
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param.append("name[]=").append(name);
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first = false;
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}
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Request request = new Request.Builder()
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.url("http://localhost:" + dockerContainer.getMappedPort(8080) + "/metrics?" + param)
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.header("Accept", "application/openmetrics-text; version=1.0.0; charset=utf-8")
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.build();
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try (Response response = client.newCall(request).execute()) {
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return Arrays.asList(response.body().string().split("\\n"));
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}
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}
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}

‎integration_tests/servlet_jakarta_exporter_webxml/src/test/resources/Dockerfile‎

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FROM jetty:11.0.6
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COPY servlet_jakarta_exporter_webxml.war /var/lib/jetty/webapps/ROOT.war

‎integration_tests/servlet_jakarta_exporter_webxml/src/test/resources/logback-test.xml‎

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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
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</encoder>
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</appender>
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<root level="info">
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<appender-ref ref="STDOUT"/>
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</root>
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<logger name="org.testcontainers" level="INFO"/>
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<logger name="com.github.dockerjava" level="WARN"/>
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</configuration>

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