1. I've got the idea for an addon which gives a message whenever a tracking of some sort is coming in.

    More detailed, I want to get a global message much like the "no flying zone" when flying in dalaran, whenever I find, lets say, an herb or an ore deposit.

    However, I cannot find the right thing to track for updates (no incoming_track widget, event or anything)

    Anyone know what I should look for?

  2. Blizzard purposely gives us absolutely no information about items that are trackable or tracked on the minimap. There's no (easy or feasible) way to find out when a new item has appeared within your area of interest.