ref: Move Prometheus from jicoco. (#2235)

* ref: Move Prometheus from jicoco.

* chore: Update jicoco to 1.1-143.

jvb/pom.xml

@@ -143,10 +143,6 @@
       <groupId>${project.groupId}</groupId>
       <artifactId>jicoco-metrics</artifactId>
     </dependency>
-    <dependency>
-      <groupId>${project.groupId}</groupId>
-      <artifactId>jicoco-metrics-jetty</artifactId>
-    </dependency>
     <dependency>
       <groupId>${project.groupId}</groupId>
       <artifactId>jitsi-xmpp-extensions</artifactId>

jvb/src/main/java/org/jitsi/videobridge/rest/prometheus/Prometheus.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright @ 2022 - present 8x8, Inc.
+ *
+ * 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.
+ */
+
+package org.jitsi.videobridge.rest.prometheus;
+
+import io.prometheus.client.exporter.common.*;
+import jakarta.ws.rs.*;
+import jakarta.ws.rs.core.*;
+import org.jetbrains.annotations.NotNull;
+import org.jitsi.metrics.*;
+
+/**
+ * A REST endpoint exposing JVB stats for Prometheus.
+ * Any scraper supporting Prometheus' text-based formats ({@code text/plain; version=0.0.4} or OpenMetrics)
+ * is compatible with this {@code /metrics} endpoint.<br>
+ * JSON is provided when the client performs a request with the 'Accept' header set to {@code application/json}.<br>
+ * The response defaults to {@code text/plain; version=0.0.4} formatted output.
+ *
+ * @see <a href="https://github.com/prometheus/docs/blob/main/content/docs/instrumenting/exposition_formats.md">
+ * Prometheus' exposition formats</a>
+ */
+@Path("/metrics")
+public class Prometheus
+{
+    @NotNull
+    private final MetricsContainer metricsContainer;
+
+    public Prometheus(@NotNull MetricsContainer metricsContainer)
+    {
+        this.metricsContainer = metricsContainer;
+    }
+
+    @GET
+    @Produces(TextFormat.CONTENT_TYPE_004)
+    public String getPrometheusPlainText()
+    {
+        return metricsContainer.getPrometheusMetrics(TextFormat.CONTENT_TYPE_004);
+    }
+
+    @GET
+    @Produces(TextFormat.CONTENT_TYPE_OPENMETRICS_100)
+    public String getPrometheusOpenMetrics()
+    {
+        return metricsContainer.getPrometheusMetrics(TextFormat.CONTENT_TYPE_OPENMETRICS_100);
+    }
+
+    @GET
+    @Produces(MediaType.APPLICATION_JSON)
+    public String getJsonString()
+    {
+        return metricsContainer.getJsonString();
+    }
+}

jvb/src/main/java/org/jitsi/videobridge/rest/root/Application.java

@@ -25,7 +25,7 @@
 import org.jitsi.videobridge.rest.*;
 import org.jitsi.videobridge.rest.binders.*;
 import org.jitsi.videobridge.rest.filters.*;
-import org.jitsi.videobridge.stats.*;
+import org.jitsi.videobridge.rest.prometheus.*;
 import org.jitsi.videobridge.xmpp.*;
 
 import static org.jitsi.videobridge.rest.RestConfig.config;
@@ -61,7 +61,7 @@ public Application(
         }
         if (config.isEnabled(RestApis.PROMETHEUS))
         {
-            register(new org.jitsi.rest.prometheus.Prometheus(VideobridgeMetricsContainer.getInstance()));
+            register(new Prometheus(VideobridgeMetricsContainer.getInstance()));
         }
     }
 }

pom.xml

@@ -28,7 +28,7 @@
         <kotest.version>5.9.1</kotest.version>
         <junit.version>5.10.2</junit.version>
         <jitsi.utils.version>1.0-133-g6af1020</jitsi.utils.version>
-        <jicoco.version>1.1-142-gfed0320</jicoco.version>
+        <jicoco.version>1.1-143-g175c44b</jicoco.version>
         <mockk.version>1.13.11</mockk.version>
         <ktlint-maven-plugin.version>3.2.0</ktlint-maven-plugin.version>
         <maven-shade-plugin.version>3.6.0</maven-shade-plugin.version>
@@ -93,11 +93,6 @@
                 <artifactId>jicoco-metrics</artifactId>
                 <version>${jicoco.version}</version>
             </dependency>
-            <dependency>
-                <groupId>${project.groupId}</groupId>
-                <artifactId>jicoco-metrics-jetty</artifactId>
-                <version>${jicoco.version}</version>
-            </dependency>
             <dependency>
                 <groupId>${project.groupId}</groupId>
                 <artifactId>jitsi-utils</artifactId>