@garritfra Cost is at best a synthetic metric, and can only be calculated with a full context.

Take for example a request that asks for the top K results in the past month. The cost is different if the database contains 1000 or 1M results. Similarly, the cost of a request that returned data after 10s may be lower than the cost of a request that times out after 5s, if UX is impacted.

Typically, instead of calculating cost one would calculate business continuity impact. This is what SLI does.