pub static OPERATION_CONTEXT_HEADER: Key<bool>Expand description
Meta-attribute marker for operation context carried on
envelope headers. Attrs declared with
@meta(OPERATION_CONTEXT_HEADER = true) are stamped onto
outgoing request envelopes and copied onto reply envelopes
by the marker-driven helpers
(stamp_marked_attrs_into_flattrs, copy_marked_flattrs).
The vocabulary describes which user operation a message
belongs to, so consumers such as the undeliverable-
abandonment log can name the operation. OPERATION_* names
the operation; it does not imply request/reply direction.