Currently the installer allows the administrator to see redacted values and all other users to be unable.
MomgoDB use 4.2 features.
With version of opCharts 4.4.1 we are supporting MongoDB 4.2 which comes with new features to develop against.
We will be using the config option db_use_v42_features : 1 in /usr/local/omk/conf/opCommon.json, to turn these features on, this is a list of features which required 4.2
After the changes you have to restart the omkd and opchartsd
# systemctl restart omkd
# systemctl restart opchartsd