I don't remember, it's been a bit of a pain to find myself. I think has either objective or notification in the file name.
I can give you some tips on how to find it and edit it:
-First of all get ingame and put "sv_pausable 1" into the console
-Bind something to "pause"
-Vote scramble and pause the game when the notification appears
-Put "vgui_drawtree 1" into console, tick highlight selected and expand the hierarchy that doesn't have engine tools in the name.
You'll eventually find the right thing, it should have the name corresponding to name field of the panel in the .res file then just ctrl+f through a few .res files until you find it.

When editing the thing I suggest you copy paste all the panels from the .res file to something like the mapinfo window or the scoreboard so you can bring it up easier and edit it there, then copy it back to the right file when you're done.

IVhud initially started as a default hud modification but as some time passed and more things changed I decided to have a simpler more centered version for more competitive games. I ended up with having 2 huds in 1 that you can toggle between by turning minimal on and off.

But because this place is more competitive oriented I'll skip over the more casual version and move right onto the minimal hud.

http://i.imgur.com/U0701gl.jpg

The hud comes with backpack and loadout screen modifications as well as custom achievement tracker crosshairs and hitmarkers (textures, work with sv_pure).
The heart health bar is optional but there by default, it's reverted to the health cross on pure servers, everything else works on pure servers. There are no custom fonts in this hud.

Supports 16:9 best but 4:3 and 16:10 versions also available, however they might have problems here and there.
More screenshots
Official group
Download link can be found in the group.