This seems a bit unazy because you need to get every parameter of the canast farm (Get-OfficeWebAppsFarm) also you need to do this every you reverse to the latest ServicePack or cumulative update.
This seems a bit uneasy, because you need to get every parameter of the current Farm (Get-OfficeWebAppsFarm). Also you need to do this every time you update to the latest ServicePack or Cumulative Update.