Add telemetry for Jenkins uptime

core/src/main/java/jenkins/telemetry/impl/Uptime.java

@@ -0,0 +1,65 @@
+/*
+ * The MIT License
+ *
+ * Copyright (c) 2023, CloudBees, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package jenkins.telemetry.impl;
+
+import edu.umd.cs.findbugs.annotations.NonNull;
+import hudson.Extension;
+import java.time.LocalDate;
+import jenkins.telemetry.Telemetry;
+import net.sf.json.JSONObject;
+import org.kohsuke.accmod.Restricted;
+import org.kohsuke.accmod.restrictions.NoExternalUse;
+
+/**
+ * Records approximations of when Jenkins was started and the current time, to allow for computation of uptime.
+ */
+@Extension
+@Restricted(NoExternalUse.class)
+public class Uptime extends Telemetry {
+    private static final long START = System.nanoTime();
+
+    @NonNull
+    @Override
+    public String getDisplayName() {
+        return "Uptime";
+    }
+
+    @NonNull
+    @Override
+    public LocalDate getStart() {
+        return LocalDate.of(2023, 10, 20);
+    }
+
+    @NonNull
+    @Override
+    public LocalDate getEnd() {
+        return LocalDate.of(2024, 1, 20);
+    }
+
+    @Override
+    public JSONObject createContent() {
+        return new JSONObject().element("start", START).element("now", System.nanoTime()).element("components", buildComponentInformation());
+    }
+}

core/src/main/resources/jenkins/telemetry/impl/Uptime/description.jelly

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+<?jelly escape-by-default='true'?>
+<j:jelly xmlns:j="jelly:core">
+    This trial collects two timestamps:
+    <ul>
+        <li><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/System.html#nanoTime()"><code>System#nanoTime</code></a> when the trial was initialized (corresponds roughly to when Jenkins was started)</li>
+        <li><a href="https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/lang/System.html#nanoTime()"><code>System#nanoTime</code></a> when the trial data was collected (i.e., when it was prepared just before submission)</li>
+    </ul>
+
+    Additionally this trial collects the list of installed plugins, their version, and the version of Jenkins.
+    This data will help understand unexpected submission frequency of other trials' data.
+</j:jelly>