Processing Time - Response time of the application/service/endpoint

The diagram below explains where the application/service/endpoint is spending time.

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e.g. A call to shop service takes 1000ms, shop service makes 2 downstream calls, one HTTP call to payment service that takes 300ms, and a DATABASE call to catalog service that takes 200ms, then the SELF time of shop service is 1000-300-200=500ms.

The processing time answers the question, if my service is slow, is it slow because of expensive processing in the service itself or is it because of some downstream dependencies.

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