PRTG provides some native Dell Sensors (e.g. SNMP Dell PowerEdge System Health Sensor). However, we don't have a native Sensor to monitor the "Dell vxrail manager". If you want to monitor this application, I recommend using the "REST Custom Sensor". The REST Custom sensor queries a REST Application Programming Interface (API) endpoint and maps the JSON or XML result to Sensor values.
For more detailed information, please follow these links:
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.