Work out shared cost split instantly with clear inputs, formula shown and shareable results.
Shared platform cost — monitoring, CI, control planes, networking — has to be allocated somehow, and the method changes behaviour. An even split makes light users subsidise heavy ones and removes any incentive to be efficient. Pure usage allocation is fairer but ignores that the platform costs something simply to exist, which is why a hybrid split is common.
Allocation methods
even = shared / teams; usage = shared x usage share; hybrid = average of both
Usage-based, because it makes efficiency visible in each team's own budget. It requires usage metrics that teams accept as accurate, which is the hard part.
Yes. Leaving it in a central bucket means nobody has an incentive to reduce it, and the platform team gets blamed for a number it does not control.