Commitments

A commitment is a promise to use a certain amount over a term in exchange for a lower rate. Get them right and they’re the largest single lever on a cloud bill. Get them wrong and you’ve prepaid for things you don’t use.

This report covers both kinds — a Reservation commits to a specific resource type, a Savings Plan commits to a level of spend per hour and is more flexible for a slightly smaller discount.

The numbers that matter

Utilisation — how much of what you bought you actually consumed. Unused commitment is money already spent for nothing, so this is the number that catches waste.

Commitment savings — list price, or the on-demand equivalent, minus what you actually paid. What the commitments earned you vs on-demand rates.

Effective savings rate — those savings as a share of list cost, across the whole portfolio. The single number for “are commitments working for us?”

Coverage is the counterpart: how much of your eligible usage a commitment covers. Low coverage means you’re paying on-demand for things a commitment could have discounted — the opposite failure to low utilization, and just as expensive.

Utilization and coverage pull against each other

High utilization with low coverage means you bought too little. High coverage with low utilization means you bought too much, or the wrong shape. You’re aiming for both to be high, and looking at either alone will mislead you.

The tabs

The screen carries several views of the same portfolio: the summary, reservations and savings plans separately, utilization, coverage and recommendations, purchases, and chargeback showing which teams consumed which commitment.

Each keeps its own saved views, and a link you copy opens on the tab you were on.

Two ways to count a purchase

Buying a commitment produces one large charge and then months of benefit, so the cost basis matters more here than almost anywhere else.

• Billed cost shows the purchase transactions as invoiced — the cash view.
• Effective cost shows the amortized cost of the commitments currently in view, spread across the term they cover.

For “what did we pay this month”, use billed. For “what is this team’s spend”, use effective — see effective cost vs billed cost.

Filters

Every global filter applies. Note that virtual tags narrow the resource-level chargeback — which resources consumed each reservation — rather than the portfolio itself. Commitments don’t carry resource tags of their own; the things consuming them do.

Before you buy anything

Two habits worth having:

• Check expiry before renewing. A commitment that expires mid-period quietly moves that spend back to on-demand rates, and the bill goes up without anyone changing anything.
• Check utilization on what you already own before buying more. Adding coverage on top of an under-used commitment compounds the mistake.