What are the best features you want to find in uptime monitoring?

Recently, I have launched a new uptime monitoring system ( odown.io ) to check websites and APIs, and I would be grateful if you could provide me with feedbacks about the most important features you want to look for in a simple uptime monitoring system

How do you pick your uptime system?
  1. Based on simplicity
  2. Based on uptime pricing
  3. Based on check quality
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