Make.Eval section : Section.t optionDefines an optional section for the event.
Warning None is only for legacy events and should not be used in new code.
Defines the identifier for the event. Names should be unique and are restricted to alphanumeric characters or ".@-_+=,~".
val pp : all_fields:bool -> block:bool -> Stdlib.Format.formatter -> t -> unitval encoding : t Data_encoding.t