  NOvA is a long-baseline neutrino oscillation experiment. It uses the NuMI
beam from Fermilab and two sampling calorimeter detectors located off-axis from
the beam. The NOvA experiment measures the rate of electron-neutrino appearance
in the almost pure muon-neutrino NuMI beam, with the data measured at the Near
Detector being used to accurately determine the expected rate at the Far
Detector. It is very important to have automated and accurate monitoring of the
data recorded by the detectors so any hardware, DAQ or beam issues arising in
the 344k (20k) channels of the Far (Near) detector which could affect the
quality of the data taking are determined. This paper will cover the techniques
and detector monitoring systems in various stages of data taking.
