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Scouter Plugin Guide

English Korean

This article explains plugin functions which enable scouter's extensibility.

With the plugin function of Scouter collector sever, data collected by scouter can be pre-handled and can be shared to other softwares.
With agent plugin, certain types of data can be modified and other business-meaningful data can be added data to XLog or profile.

Scouter plugins enable Scouter to collaborate with other open sources.

Scouter has 2 type of plugins - server plugin and an agent plugin.
server plug-in is for to collector server
and agent Plugin is for to Java agent.
Server plugin has 2 type plugins including script-type plugin, built-in-type plugin.

List of available plugins

Below are the list of official plugins from scouter project and from contributors.

1. server plugins (built-in type)

2. agent plugins

  • TBD

Server Plugin - How to

1. Script (type) Plugin

A scripting plugin is called right before xlog data is stored in a repository. You can add simple script for manipulate some data on the plugin files which are located in the directory [server_running_dir]/plugin by default.

Scouter distribution has the samples and the file name can not be modified.
Currently 6 types of scripting plugins are supported.

  • alert.plug - for pre-handling alert
  • counter.plug - for pre-handling performance metrics(counters)
  • object.plug - for pre-handling monitoring objects(instances)
  • summary.plug - for pre-handling performance summary data
  • xlog.plug - for pre-handling xlog data
  • xlogprofile.plug - for pre-handling xlog profile

refer to the link for details. refer to Scripting plugin Server API.

2. Built-in (type) Plugin

Builing scripting plugin is very simple and can be dynamically loaded on runtime environment.
On the other hand if you need the function permanently, it's too easy to fragile. So scouter provides another plugin type which allow you can attach pre-built compiled plugin and it's called as Built-in Plugin.

Scouter load the plugins on startup, if the plugins are located in scouter server's library directory.(default:[server_running_dir]/lib)

2.1 Server Built-in Plugin development guide

1. dependency
  • scouter.common 
    <dependency>
    <groupId>io.github.scouter-project</groupId>
    <artifactId>scouter-common</artifactId>
    <version>1.7.0</version>
</dependency>
  • scouter.server 
    <dependency>
    <groupId>io.github.scouter-project</groupId>
    <artifactId>scouter-server</artifactId>
    <version>1.7.0</version>
</dependency>
2. Annotation

scouter.lang.plugin.annotation.ServerPlugin

  • Example
package scouter.plugin.server.none;
public class NullPlugin {
    Configure conf = Configure.getInstance();

	@ServerPlugin(PluginConstants.PLUGIN_SERVER_ALERT)
    public void alert(AlertPack pack){
        if(conf.getBoolean("ext_plugin_null_alert_enabled", true)) {
            println("[NullPlugin-alert] " + pack);
        }
    }
  • Check it.
  1. The file is located sub package of scouter.plugin.server because annotation scan scope is from scouter.plugin.server package.
  2. The plugin can use scouter server's configuration and the option name must start with ext_plugin_xxx.

  • ServerPlugin annotations

    • PLUGIN_SERVER_COUNTER
    • PLUGIN_SERVER_ALERT
    • PLUGIN_SERVER_OBJECT
    • PLUGIN_SERVER_SUMMARY
    • PLUGIN_SERVER_XLOG
    • PLUGIN_SERVER_PROFILE

2.3. plugin sample

Provided sample plugin that just prints the data collected.

3. Alert scripting (type) plugin

We can build our own alarm rules by handling alert scripting plugins which are able to compose various performance metrics.


Agent Plugin - Scripting Plugin

Java agent plugin

Scripting plugin can be loaded dynamically on runtime so it is used for debugging also
It's very useful to print some method's parameters or stacktrace on specific point and also can add additional (user-defined) profile information to the xlog or xlog profile.
The scripting plugin is invoked at some important points and the default location of the plugin file is ./plugin.
Scouter distribution includes sample plugin files and the file name can not be modified.

filename desc
httpservice.plug Invoked at begin and end of http service.
service.plug Invoked at begin and end of user defined service. (The services are set by hook_service_patterns option)
httpcall.plug Invoked at calling to another service using httpclients library
capture.plug Invoked at init, start, end of methods that are set by options hook_method_patterns or hook_constructor_patterns
jdbcpoolplug Invoked at calling DB connection URL

Refer to the link for details Scripting plugin java agent API