1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * See LICENSE.txt included in this distribution for the specific 9 * language governing permissions and limitations under the License. 10 * 11 * When distributing Covered Code, include this CDDL HEADER in each 12 * file and include the License file at LICENSE.txt. 13 * If applicable, add the following below this CDDL HEADER, with the 14 * fields enclosed by brackets "[]" replaced with your own identifying 15 * information: Portions Copyright [yyyy] [name of copyright owner] 16 * 17 * CDDL HEADER END 18 */ 19 20 /* 21 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 22 */ 23 package org.opengrok.web.servlet; 24 25 import jakarta.servlet.annotation.WebServlet; 26 import jakarta.servlet.http.HttpServlet; 27 import jakarta.servlet.http.HttpServletRequest; 28 import jakarta.servlet.http.HttpServletResponse; 29 import org.opengrok.indexer.Metrics; 30 31 import java.io.IOException; 32 import java.io.PrintWriter; 33 34 @WebServlet("/metrics/prometheus") 35 public class MetricsServlet extends HttpServlet { 36 37 private static final long serialVersionUID = 0L; 38 39 @Override doGet(final HttpServletRequest req, final HttpServletResponse resp)40 protected void doGet(final HttpServletRequest req, final HttpServletResponse resp) throws IOException { 41 try (PrintWriter pw = resp.getWriter()) { 42 pw.print(Metrics.getPrometheusRegistry().scrape()); 43 } 44 } 45 } 46