Term Kind Topic What it is
Idempotent Consumer pattern Exactly-Once Semantics A message consumer whose effect is the same whether a message is processed once or many times, which is what makes at-least-once delivery safe.
Idempotent Sink pattern Exactly-Once Semantics A destination where writing the same record twice has the same effect as writing it once, which is what makes end-to-end exactly-once achievable at all.