Unlike other active items such as Locket, Face of the Mountain does not track shielded damage.

Items such as Redemption shows healing done to allies and damage done to enemies, which allows you to track how efficiently you are using the active throughout a game. On the other hand, Face of the Mountain does not have this feature, but rather tracks the amount of gold gained throughout the game. It would be a welcome change to be able to see how much damage is blocked using the active component of Face of the Mountain.

On a side note it would also be a welcome change to have the statistics for active items shown in match history. This is one aspect of gameplay that is not tracked that would actively assist players in analysing their games and further improve.