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Using the DataHub to monitor the availability of a remote process

This DataHub script monitors the availability of a remote (or local) process, by querying to see whether the process is listening on a specified port.

This can be any port on which the target process is reachable - this can be a configuration port, a communication port, an internal application port, etc. Just as long as it is accessible from the machine on which DataHub is running (I.e. if a firewall is blocking traffic to the port we will not be able to query the application state).
This script makes use of the Microsoft PortQuery tool (https://www.microsoft.com/en-us/download/confirmation.aspx?id=17148) to query whether there is anything listening on the specified port/host.
To load this script:
  1. Download it below and import it into your DataHub
  2. Update the remoteIP variable on line 22 to be the host name or IP address of the machine on which the process resides
  3. Update the remotePort variable on line 28 to be the port on which the application is listening
  4. Update the storageFile variable to point to a directory in which the script can store a small, temporary, file that is generated during runtime. This file is overwritten during each query so will not consume any disk space.
  5. Update the queryInterval variable for how often the script should run - it defaults to every 5 seconds.
By default the script prints the service state to the DataHub script log - custom reporting can be easily implemented by modifying lines 66 and 68 to handle the service query results however desired.