Add Importance to empty/full notications.

Some containers being empty (or Full) require a Critical red Notification. like the town's water tank being empty or the Main's sewer take being full. while others are just minor importance, like I am out of meat in the storage feeding the town. Others might even be good thingk like gold storage being full, so I can put the gold processing plant on idle for a while.
I would be nice when you set the notification on fill levels you can also set Critical (Red), Warning (Amber), or Objective (Green)

I don't know if this would fully meet your need, but are you aware you can change the color of the text in the storage name? (and optionally turn the rest of the message the same color as well)
When renaming the entity, add <color=red> before the name. And add </color> at the end if you DON'T want it to recolor the entire message after the name. You can do the same thing with size. 14 is the "normal" size. I don't know all of the colors you can choose but they certainly include red, yellow, green, and blue.