prop_weapon_upgrade_contractkill

This entity is not in the FGD by default.
See below for instructions on making it available.

prop_weapon_upgrade_contractkill is an e0 available in Counter-Strike: Global Offensive.

Warning:

• The {{{game}}} parameter is inconsistent with the name defined by the {{csgo}} template. This can most likely be fixed by setting the value of the {{{game}}} parameter to Counter-Strike: Global Offensive.
  If a parameter is consistent but you're still seeing this warning, it may be an issue with the template itself. Please discuss it on the template's talk page.

It's one of many new entities added with the Danger Zone update.

Note:Placing this entity manually in level will work, however it won't have outline glow.