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Monitoring with Prometheus

Prometheus is an open source toolkit that can monitor systems and produce useful information such as graphs and alerts. It collects statistical data exposed over an HTTP endpoint in the form of multi dimensional time series data, which can be then be visualized and queried. See the Prometheus documentation for more information.

Overview

WSO2 Micro Integrator exposes its statistical data through JMX as MBeans. The Prometheus publisher in the Micro Integrator scrapes these bean data and converts them to the Prometheus format. The converted metrics are then exposed through an HTTP endpoint, which is used by Prometheus to scrape the statistical data.

Configuring the Prometheus server

  1. Download and install Prometheus.
  2. Open the PROMETHEUS_HOME/prometheus.yml file. Add a scrape config as to this file as shown below. The port number and the endpoint name should be as specified below.

    scrape_configs:
         - job_name: "esb_stats"
           static_configs:
             - targets: ['localhost:9201']
           metrics_path: "metric-service/metrics"
  3. Save the configuration file.

Starting the Prometheus server

To start the Prometheus server, navigate to the PROMETHEUS_HOME and execute the start-up script located there.

Starting the Micro Integrator

To use Prometheus, you need to first start the WSO2 Micro Integrator instance by passing the 'enablePrometheusApi' system property. This system property will connect the Micro Integrator to Prometheus, and enable the Micro Integrator to publish statistics to Prometheus.

  • If your Micro Integrator is running on Docker, start your Docker container by passing the 'enablePrometheusApi' system property:

    docker run -p 8290:8290 -e JAVA_OPTS="-DenablePrometheusApi=true" <Docker_Image_Name>
  • If your Micro Integrator is running on a VM with Prometheus enabled, navigate to the MI_HOME/bin directory and issue one of the following commands.

    • On Windows: integrator.bat -DenablePrometheusApi
    • For Linux/MacOS/CentOS : ./integrator.sh -DenablePrometheusApi

Viewing statistics

The stats can be viewed in following urls.

http://localhost:9201/metric-service/metrics

You may also visit following url in Prometheus server to plot the graphs.

http://localhost:9090/graph
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