Currently, we do not provide any native sensor for the Extreme switches, but you might want to check this https://kb.paessler.com/en/topic/65638 which explains the possible way to monitor extreme switches.
Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.