CloudKit Dashboard - stopped showing active users

Our app uses a container with a public database. Around 17th of January, active users suddenly dropped to ‘1’ and remained at that level since then every day, yet all other metrics seems to be correct and grow, the app is working fine and we get new users every day. Exactly the same issue occurred with one of our other apps. Is this a bug with the web dashboard? Is anyone else experiencing the same issue?'