Whether you have at-least or at-most semantics is more related to when you commit relative to your other logic than whether you do it automatically or manually,

Whether you have at-least or at-most semantics is more related to when you commit relative to your other logic than whether you do it automatically or manually, but for common cases where you “do something” like an HTTP call or increment a number in Redis per message, autocommit will give you at-least (it will commit after the next poll call which happens after processing the items).