Multiple user access for one project

Need Help With My Project
1

1.I created one project water level monitoring . I need 10 peoples to be monitored the value in blynk app
2. How to create alerts for high level and low level of water
3 . How do I know hardware failure , because it is showing last received value

2

I hope you are using the new version of Blynk.
https://blynk.cloud

  1. Invite new members
  2. Set up events
  3. Invalidate value: Invalidate Value - Blynk Documentation