Jenkins Remoting monitoring with OpenTelemetry Plugin

• Introduction
• Quick Demo
• Getting started with Inbound Agent
• Configuration options
• Specification
• Contributing
• LICENSE
• Links

Introduction

Goal

The goal of this project:

• collect telemetry data(metrics, traces, logs) of remoting module with OpenTelemetry.

• send the telemetry data to OpenTelemetry Protocol endpoint

Which OpenTelemetry endpoint to use and how to visualize the data are up to users. Collect telemetry data of Jenkins Remoting using OpenTelemetry.

OpenTelemetry

An observability framework for cloud-native software

OpenTelemetry is a collection of tools, APIs, and SDKs. You can use it to instrument, generate, collect, and export telemetry data(metrics, logs, and traces) for analysis in order to understand your software’s performance and behavior.

Quick Demo

Using Minikube and Kubernetes plugins

Visit https://github.com/Aki-7/remoting-opentelemetry-kubernetes-demo

Using Docker compose

Clone our repository, and then,

$ cd example
$ docker-compose up # it may take few minutes

This will set up

• Jenkins controller

  • preconfigured with JCasC

• Jenkins inbound agents

  • instrumented with our monitoring engine

• OpenTelemetry Collector

• Loki for Log aggregation

• Prometheus for metric backend

• Grafana for log and metric visualization

  • datasource is already configured

Open Grafana: http://localhost:3000/explore

You can see agents' log in Loki datasource and agents' metrics in Prometheus datasource.

Getting started with Inbound Agent

1. Install Remoting monitoring with OpenTelemetry Plugin

Please install Remoting monitoring with OpenTelemetry Plugin into your Jenkins controller.

If you want, you can set up Jenkins controller with this plugin installed using Docker Compose. Please the next section for details.

Plugin page: https://plugins.jenkins.io/remoting-opentelemetry

2. Setup OpenTelemetry protocol endpoint and monitoring backends

We prepare docker-compose.yaml to set up them. Use it if you just want to try.

Clone our repository, and then

$ cd example
$ docker-compose up otel_collector loki prometheus grafana jenkins_blueocean
# or if you use your own Jenkins controller,
$ docker-compose up otel_collector loki prometheus grafana

This will set up

• OpenTelemetry Collector

• Loki for Log aggregation

• Prometheus for metric backend

• Grafana for log and metric visualization

  • datasource is already configured

• Jenkins Controller

  • Remoting monitoring with OpenTelemetry Plugin is preinstalled.

3. Download monitoring-engine

Download remoting-opentelemetry-engine.jar from Jenkins maven repository.

$ curl "https://repo.jenkins-ci.org/artifactory/releases/io/jenkins/plugins/remoting-opentelemetry-engine/[RELEASE]/remoting-opentelemetry-engine-[RELEASE].jar" -o remoting-opentelemetry-engine.jar

We will use this JAR as java agent when launching agent.

4. Create logging.properties file.

Use io.jenkins.plugins.remotingopentelemetry.engine.log.OpenTelemetryLogHandler for handler.

logging.properties

handlers=io.jenkins.plugins.remotingopentelemetry.engine.log.OpenTelemetryLogHandler,java.util.logging.ConsoleHandler
.level=INFO

5. Launch Jenkins agent

Setup jenkins controller and launch agent with -javaagent and -loggingConfig option.

$ export OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:55680
$ java \
-javaagent:remoting-opentelemetry-engine.jar \
-jar agent.jar \
-jnlpUrl <jnlp url> \
-loggingConfig logging.properties

6. Explore logs and metrics

Open Grafana: http://localhost:3000/explore

Configuration options

We can configure the monitoring engine via environment variables.

environment variable	require	example / description
OTEL_EXPORTER_OTLP_ENDPOINT	true	http://localhost:55680
		Target to which the exporter is going to send spans, metrics or logs.
SERVICE_INSTANCE_ID	false	90caeb02-a5ba-4827-bb3e-63babecfa893
		The string ID of the service instance. If not provided, UUID will be generated every time the agent launches. Note: If you don’t set this value, the service instance id will be changed everytime the agent restarts.
REMOTING_OTEL_METRIC_FILTER	false	"system\.cpu\..*"
		Set regex filter for metrics. The metrics whose name match the regex will be collected. The default value is ".*" and collect all the metrics.

Specification

Resource

Following resource attributes will be provided.

key	value	description
service_namespace	"jenkins"	This value will be configurable in the future.
service_namespace	"jenkins-agent"	This value will be configurable in the future.
service_instance_id	Node name

Logs

Only logs emitted via java.util.logging will be collected for now.

Following attributes will be provided.

key	example	description
log.level	INFO	Log level name. See java.util.logging.Level.getName.
code.namespace	hudson.remoting.jnlp.Main$CuiListener	The name of the class that (allegedly) issued the logging request.
code.function	status	The name of the method that (allegedly) issued the logging request.
exception.type	java.io.IOException	The class name of the throwable associated with the log record.
exception.message	Broken pipe	The detail message string of the throwable associated with the log record.
exception.stacktrace	java.io.IOException: Broken pipe at hudson.remoting.Engine.innerRun(Engine.java:784) at hudson.remoting.Engine.run(Engine.java:575)	The stacktrace the throwable associated with the log record.

Spans

TBD

Metrics

Following metrics will be collected.

metrics	unit	label key	label value	description
jenkins.agent.connection.establishments.count	1			The count of connection establishments. The value will be reset when the agent restarts.
system.cpu.load	1			System CPU load. See com.sun.management.OperatingSystemMXBean.getSystemCpuLoad
system.cpu.load.average.1m				System CPU load average 1 minute See java.lang.management.OperatingSystemMXBean.getSystemLoadAverage
system.memory.usage	byte	state	used, free	see com.sun.management.OperatingSystemMXBean.getTotalPhysicalMemorySize and com.sun.management.OperatingSystemMXBean.getFreePhysicalMemorySize
system.memory.utilization	1			System memory utilization, see com.sun.management.OperatingSystemMXBean.getTotalPhysicalMemorySize and com.sun.management.OperatingSystemMXBean.getFreePhysicalMemorySize. Report 0% if no physical memory is discovered by the JVM.
system.paging.usage	byte	state	used, free	see com.sun.management.OperatingSystemMXBean.getFreeSwapSpaceSize and com.sun.management.OperatingSystemMXBean.getTotalSwapSpaceSize.
system.paging.utilization	1			see com.sun.management.OperatingSystemMXBean.getFreeSwapSpaceSize and com.sun.management.OperatingSystemMXBean.getTotalSwapSpaceSize. Report 0% if no swap memory is discovered by the JVM.
system.filesystem.usage	byte	device	(identifier)	System level filesystem usage. Linux only (get mount data from /proc/mounts).
		state	used, free
		type	ext4, tmpfs, etc.
		mode	rw,ro,etc.
		mountpoint	(path)
system.filesystem.utilization	1	device	(identifier)	System level filesystem utilization (0.0 to 1.0). Linux only (get mount data from /proc/mounts).
		state	used, free
		type	ext4, tmpfs, etc.
		mode	rw,ro,etc.
		mountpoint	(path)
process.cpu.load	%			Process CPU load. See com.sun.management.OperatingSystemMXBean.getProcessCpuLoad.
process.cpu.time	ns			Process CPU time. See com.sun.management.OperatingSystemMXBean.getProcessCpuTime.
runtime.jvm.memory.area	bytes	type	used, committed, max	see MemoryUsage
		area	heap, non_heap
runtime.jvm.memory.pool	bytes	type	used, committed, max	see MemoryUsage
		pool	PS Eden Space, G1 Old Gen…​
runtime.jvm.gc.time	ms	gc	G1 Young Generation, G1 Old Generation, …​	see GarbageCollectorMXBean
runtime.jvm.gc.count	1	gc	G1 Young Generation, G1 Old Generation, …​	see GarbageCollectorMXBean

Contributing

Refer to our contribution guidelines.

LICENSE

Licensed under MIT, see LICENSE

Links

• Jenkins.io project page