I currently only have a small number of sensors deployed. On my old EPO 3.6.1 installation there was only one sensor, that being installed upon the EPO server itself, and it managed to find everything fine. EPO is currently telling me my sensor health is poor, and also, that my sensors are passive and there are no active ones.
How can this be altered, and how many sensors should I deploy? I blacklisted mostly everything to stop sensors deploying automatically.