Adoption Curve
The proportion of teams actually using a platform capability over time, which is the only honest measure of whether the platform is working.
A platform that exists and is not used has cost money and delivered nothing. Adoption is therefore the primary metric, and it should be tracked per capability rather than in aggregate, because the aggregate hides the pattern.
The shape of the curve is diagnostic. A curve that rises quickly and plateaus at sixty percent usually means the remaining forty have a genuine requirement the platform does not meet — worth finding out what, rather than escalating. A curve that is flat from the start means teams did not know, did not believe, or tried and bounced. A curve that rises only under mandate will reverse the moment attention moves elsewhere.
The counterpart measurement is departure: how many teams left the paved road after initially adopting, and at which step. That is more informative than the headline, because it identifies the specific capability that failed to hold up under real use, which no satisfaction survey will surface with the same precision.