Logs.LOG
val app : 'a log
val err : 'a log
val warn : 'a log
val info : 'a log
val debug : 'a log
val on_error : ?level:level -> ?header:string -> ?tags:Tag.set ->
pp:(Stdlib.Format.formatter -> 'b -> unit) -> use:('b -> 'a) -> ('a, 'b) Stdlib.result -> 'a
val on_error_msg : ?level:level -> ?header:string -> ?tags:Tag.set -> use:(unit -> 'a) ->
('a, [ `Msg of string ]) Stdlib.result -> 'a