Optional ReadonlymaxMax in-flight batches before backpressure.
Optional ReadonlymaxMax in-flight bytes before backpressure (default: 3 MiB).
Optional ReadonlystreamStream configuration to apply if the stream is created by the session. Unset fields inherit the basin's default stream configuration. Ignored if the stream already exists. Sent when the session connects and reconnects.
Options for append sessions (backpressure control).