Gotcha 3 is actually a warning.

Indeed, it's a warning. Still, I found this behaviour surprising, and decided to describe it in my blog post 😌

Also, deciphering severity from the icons looks complicated.

I don't think it's critical for the blog post understanding. Just a little extra from me to make the text less boring.

My idea was:

• 🍹- chill, not really important
• ⚠️ - warning, you may have potential problems
• 💀 - something really dangerous can happen

You can also directly match the reason part in Pending. Not always practical, but in your example, I might have written:

let show_status status =
  match status with
  | Cancelled -> "Cancelled"
  | Done -> "Done"
  | Pending Waiting -> "Pending: Waiting"
  | Pending Validating -> "Pending: Validating"