Like @mark.lemm mentioned, if you’re talking about alerts from the CPU datapoint, there’s not really a way to do that in that DS. That DS just asks the device, “what’s your cpu usage” and the device responds with the overall number. The device would have to know that you don’t want to include certain processes in the overall number, which leads down the path of a different DS.
If you are talking about one of the several process monitoring options that are available, just disable the instance corresponding to the unwanted service or put SDT on the instance.
