An accepted API call is not a successful change
AWS can accept a request while the system takes time to converge—or reaches a state you did not intend. Verification checks the customer's outcome.
Write a measurable postcondition
“The update returned HTTP 200” describes the request. “All three registered targets stay healthy for five consecutive checks” describes the service outcome.
Change accepted→Wait for convergence→Observe service state→Postcondition met
Practice
You increase an ECS service's desired count from 3 to 6. Which evidence best verifies success?
Lesson completion is disabled in the public demo; points are only awarded from verified server-side events.