Note: "connected" here means across all real-time pods.
- editing_session_mode, counter
- mode=connect - a client connected
- mode=disconnect - a client disconnect
- mode=update - continuous editing
- status=empty - all clients disconnected
- status=single - a single client is connected
- status=multi - multiple clients are connected
- project_not_empty_since histogram with buckets [0,1h,2h,1d,2d,1w,30d]
- status=empty/single/multi as described above
GitOrigin-RevId: 1cc42e72bbb5aae754399bdbc3f8771642f35c22