[jmx-scraper] Package jmx scraper as a deb/rpm/tar.gz package #1964

 - #1964
 - added copyJarForPackage for gradle to copy jar for packaging
 - added createTarBall to create a packaged tar.gz
 - added systemd service file

Author: mcmho

jmx-scraper/build.gradle.kts

@@ -1,9 +1,7 @@
 plugins {
   application
   id("com.gradleup.shadow")
-
   id("otel.java-conventions")
-
   id("otel.publish-conventions")
 }
 
@@ -92,6 +90,39 @@ tasks {
   }
 }
 
+// This task copies the jar to a package dir for packaging.
+val copyJarForPackage by tasks.registering(Copy::class) {
+  dependsOn(tasks.jar)
+
+  // Clean target directory before copying
+  doFirst {
+    val targetDir = file("package/usr/local/bin")
+    if (targetDir.exists()) {
+      targetDir.deleteRecursively()
+    }
+  }
+
+  from(tasks.jar.get().outputs.files)
+  into("package/usr/local/bin")
+  rename { "jmx-scraper.jar" }
+}
+
+// This task creates a tarball of the package directory.
+val createTarball by tasks.registering(Tar::class) {
+  dependsOn(copyJarForPackage)
+  archiveBaseName.set("opentelemetry-jmx-scraper")
+  archiveVersion.set(project.version.toString())
+  archiveExtension.set("tar.gz")
+  compression = Compression.GZIP
+  // simply put it at the project root
+  destinationDirectory.set(file("./"))
+
+  from("package") {
+    // preserve directory structure relative to package/
+    into("/")
+  }
+}
+
 // Don't publish non-shadowed jar (shadowJar is in shadowRuntimeElements)
 with(components["java"] as AdhocComponentWithVariants) {
   configurations.forEach {

jmx-scraper/package/etc/systemd/jmx-scraper.service

@@ -0,0 +1,15 @@
+[Unit]
+Description=OpenTelemetry JMX Scraper
+After=network.target
+
+[Service]
+Type=simple
+User=jmxscraper
+Group=jmxscraper
+ExecStart=/usr/bin/java -jar /usr/local/bin/jmx-scraper.jar
+Restart=on-failure
+RestartSec=10
+WorkingDirectory=/usr/local/bin
+
+[Install]
+WantedBy=multi-user.target