pub static INBOUND_ORDERING: Key<OrderingSnapshot>Expand description
Per-session reorder state from the sequenced receiver snapshot.
sessions[*].buffered_count reports messages held by
receiver-local sequencing waiting for a seq gap to fill. Independent
diagnostic from queue_depth; no arithmetic contract – see
IO-3.
Absence (None on ActorAttrsView) means structural absence
(no snapshot callback installed). Some({enabled: false, ...})
means the path exists but buffering is disabled. See IO-1.