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title: Monitor Plugin keywords: [“monitor”] description: monitor plugin

Description

• Monitor plugin is used to monitor its own running status(JVM-related) by gateway, include request response delay, QPS, TPS, and other related metrics.

Technical Solutions

• Flow Diagram

• Make even tracking in ShenYu Gateway by asynchronous or synchronous mode.

• The prometheus server pulls metrics' through http request, and then displays it by Grafana.

Plugin Setting

• In shenyu-admin--> BasicConfig --> Plugin --> monitor, set to enable.
• Add the following configuration in the monitor plugin.

{"metricsName":"prometheus","host":"localhost","port":"9190","async":"true"}

# port : Pulled ports for exposing to prometheus service.
# host : If not filled in, it is the host of Apache ShenYu Gateway.
# async :"true" is asynchronous event tracking， false is synchronous event tracking.

• If the user don't use, please disable the plugin in the background.
• Introduce monitor dependency in the pom.xml file of the gateway.

  <!-- apache shenyu monitor plugin start-->
  <dependency>
      <groupId>org.apache.shenyu</groupId>
      <artifactId>shenyu-spring-boot-starter-plugin-monitor</artifactId>
      <version>${project.version}</version>
  </dependency>
  <!-- apache shenyu monitor plugin end-->

• Selectors and rules, please refer to: Selector And Rule Config.
• Only when the url is matched, the url will request event tracking.

Metrics Detail

• All JVM，thread，memory，and other related information will be made event tracking，you can add a JVM module in the Grafana' panel, and it will be fully displayed, please refer to： https://github.com/prometheus/jmx_exporter

• There are also the following custom metrics

Name	type	target	description
request_total	Counter	none	collecting all requests of Apache ShenYu Gateway
http_request_total	Counter	path,type	collecting all matched requests of monitor

Collect metrics

Users need to install Prometheus service to collect

• Choose the corresponding environment download address to install
• Modify configuration file: prometheus.yml

scrape_configs:
  # The job name is added as a label `job=<job_name>` to any timeseries scraped from this config.
  - job_name: 'prometheus'
    # metrics_path defaults to '/metrics'
    # scheme defaults to 'http'.
    static_configs:
    - targets: ['localhost:9190']

Note: The job_name corresponds to the metricsName of the monitor plug-in configuration

• After the configuration is completed, you can directly double-click prometheus.exe in the window to start. The default boot port is 9090, Success can be verified at http://localhost:9090/

Panel Display

It is recommended to use Grafana, Users can customize the query to personalize the display panel.

Here's how to install and deploy Grafana for Windows

• Install Grafana

download Unzip it and enter the bin directory and double-click grafana-server.exe to run it. Go to http://localhost:3000/?orgId=1 admin/admin to verify the success

• Config Prometheus DataSource

• Config JVM Dashboard

Click Create - Import and enter the dashboards ID (8563 recommended).

The final JVM monitor panel looks like this:

• Config Custom Metric Dashboard request_total、http_request_total

Click Create - Import and enter the panel config json

The final custom HTTP request monitoring panel looks like this: