Command Watcher Monitoring Extension

Command watcher monitoring extension


An AppDynamics extension to be used with a stand-alone Java machine agent to provide metrics from linux commands or script that generates a numeric output.



Before the extension is installed, the prerequisites mentioned here need to be met. Please do not proceed with the extension installation if the specified prerequisites are not met.


Metrics Provided


We provide metric related to output of the linux command or the script file that generates single numeric output.


For example: 


abhi.pandey@osxltapand:~$ps -ef | grep java | wc -l




  1. Download and unzip from AppSphere.
  2. Copy the CommandWatcher directory to `<MACHINE_AGENT_HOME>/monitors`.
  3. Edit the file config.yml located at <MachineAgent_Dir>/monitors/ The metricPrefix of the extension has to be configured as specified here. Please make sure that the right metricPrefix is chosen based on your machine agent deployment, otherwise this could lead to metrics not being visible in the controller.





Please make sure to not use tab (\t) while editing yaml files. You may want to validate the yaml file using a yaml validator


  1. Configure the file to be watched by editing the config.yaml file in `<MACHINE_AGENT_HOME>/monitors/ CommandWatcher /`. Below is the format


Important - displayName has to be unique for the command/script file


# List of commands

- displayName: "File descriptor"
command: "lsof | wc -l"
isScript: false

- displayName: "Java count script"
command: "/Users/abhi.pandey/Downloads/"
isScript: true

# Make sure the metric prefix ends with a |
metricPrefix: "Custom Metrics|Command Watcher|"



  1. Configure the path to the config.yaml file by editing the <task-arguments> in the monitor.xml file. Below is the sample


<!-- config file-->
<argument name="config-file" is-required="true" default-value="monitors/CommandWatcher/config.yml" />




Please look at the troubleshooting document and make sure that everything is followed correctly.

Command Watcher Metrics


Screen Shot 2015-05-06 at 2.33.44 PM.png




Always feel free to fork and contribute any changes directly via GitHub.




Find out more in the Community.




For any questions or feature request, please contact AppDynamics Support.





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