Platform & DevOps·What the platform costs
you look at a fortnight of real usage and cut the requests in half, and nothing at all happens.
Rightsizing
Also calledright-sizing, resource tuning
Matching provisioned resources to observed usage plus deliberate headroom. It is unglamorous, repeatable and usually the single largest available saving, and it decays continuously as workloads change, so it is a recurring exercise rather than a project. The risk is rightsizing to an average and discovering the peak, which is why the percentile you size to should be a decision rather than an accident.