Define an availability indicator that matches checkout outcomes.

Instruction: Specify eligible events, good events, the measurement point and a known blind spot.

Context:

A fictional checkout API returns 200 when an order is durably accepted, 400 for invalid input, 429 when capacity is exhausted and 500 for internal failures. Product wants to measure whether valid customer order attempts succeed. The edge can classify invalid input under an agreed validated rule. Some failures occur before requests reach the application.

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I would count valid customer order attempts at the agreed boundary and mark an attempt good only when the order is durably accepted within the defined response contract...

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