Opentelemetry_core.Trace_idTrace ID.
This 16 bytes identifier is shared by all spans in one trace.
val create : unit -> tval dummy : tval pp : Stdlib.Format.formatter -> t -> unitval is_valid : t -> boolval to_bytes : t -> bytesval of_bytes : bytes -> tval to_hex : t -> stringval to_hex_into : t -> bytes -> int -> unitval of_hex : string -> tval of_hex_substring : string -> int -> tHmap key to carry around a Trace_id.t, to remember what the current trace is.