The Discovery tab in the navigation bar does not show up because it appears to be functioning at the wrong access levels. For example:
Users can not see the Monitoring -> Discovery tab so they can not see the discovery results. You have to be an Admin to see it.
Admins can not see the Configuration -> Discover tab so they can not create discovery rules. You have to be a super admin to see that.

Both of these issues create severe and insurmountable security/ permission problems which make the feature unusable. We would love to see this fixed so the tabs operate at the proper permission levels, most especially so our Users (IT staff) can see the scan results to ensure system security is being followed. We would also like our network admin to be able to create scans, but we don't want to grant him super admin to do so.