Attributes available to pass data from Orion "Create SolarWinds Service Desk Incident" alert action

Is there a complete list of the Attributes / Custom attributes that are available to pass information in from the Orion "Create SolarWinds Service Desk Incident" alert action 

So the ones I have below will link to fields that get generated in the incident.   Wondering if there are any more, such as for the "Assigned to" field etc. would like to get a complete list if possible.  Looked through the forums and admin guides etc and either my google fu is weak or its not there.