pepov commented on a change in pull request #3257: NIFI-5435 Prometheus /metrics http endpoint for monitoring integration URL: https://github.com/apache/nifi/pull/3257#discussion_r256559891
########## File path: nifi-nar-bundles/nifi-prometheus-bundle/nifi-prometheus-reporting-task/src/main/java/org/apache/nifi/reporting/prometheus/PrometheusServer.java ########## @@ -0,0 +1,99 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You 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. + */ + +package org.apache.nifi.reporting.prometheus; + +import java.io.IOException; +import java.io.OutputStreamWriter; +import java.net.HttpURLConnection; +import java.net.InetSocketAddress; + +import javax.servlet.ServletException; +import javax.servlet.ServletOutputStream; +import javax.servlet.http.HttpServlet; +import javax.servlet.http.HttpServletRequest; +import javax.servlet.http.HttpServletResponse; + +import org.apache.nifi.controller.status.ProcessGroupStatus; +import org.apache.nifi.logging.ComponentLog; +import org.apache.nifi.reporting.ReportingContext; +import org.apache.nifi.reporting.prometheus.api.PrometheusMetricsFactory; +import org.eclipse.jetty.server.Server; +import org.eclipse.jetty.servlet.ServletContextHandler; +import org.eclipse.jetty.servlet.ServletHolder; + +import com.yammer.metrics.core.VirtualMachineMetrics; + +import io.prometheus.client.CollectorRegistry; +import io.prometheus.client.exporter.common.TextFormat; + +public class PrometheusServer { + private static ComponentLog logger; + private Server server; + private ServletContextHandler handler; + + public static ReportingContext context; + public static boolean sendJvmMetrics; + public static String applicationId; + + // set context, SEND_JVM_METRICS, applicationId values are set in onTrigger + + static class MetricsServlet extends HttpServlet { + private CollectorRegistry nifiRegistry, jvmRegistry; + private ProcessGroupStatus rootGroupStatus; + + @Override + protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws ServletException, IOException { + logger.info("Do get called"); + + rootGroupStatus = context.getEventAccess().getControllerStatus(); + ServletOutputStream response = resp.getOutputStream(); + OutputStreamWriter osw = new OutputStreamWriter(response); + + nifiRegistry = PrometheusMetricsFactory.createNifiMetrics(rootGroupStatus, applicationId); + + TextFormat.write004(osw, nifiRegistry.metricFamilySamples()); + + if (sendJvmMetrics == true) { + jvmRegistry = PrometheusMetricsFactory.createJvmMetrics(VirtualMachineMetrics.getInstance()); + TextFormat.write004(osw, jvmRegistry.metricFamilySamples()); + } + + osw.flush(); + osw.close(); + response.flush(); + response.close(); + resp.setHeader("Content-Type", TextFormat.CONTENT_TYPE_004); + resp.setStatus(HttpURLConnection.HTTP_OK); + resp.flushBuffer(); + } + } + + public PrometheusServer(InetSocketAddress addr, ComponentLog logger) throws Exception { + PrometheusServer.logger = logger; + this.server = new Server(addr); + + this.handler = new ServletContextHandler(server, "/metrics"); Review comment: That is the default and every exporter uses the same, so I think it's ok: https://prometheus.io/docs/prometheus/latest/configuration/configuration/#scrape_config https://prometheus.io/docs/instrumenting/writing_exporters/#landing-page ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
