You can search for identifiers within the package.
in-package search v0.2.0
val msg : Logs.level -> 'a Logs.log
val app : 'a Logs.log
val err : 'a Logs.log
val warn : 'a Logs.log
val info : 'a Logs.log
val debug : 'a Logs.log
val kmsg : (unit -> 'b) -> Logs.level -> ('a, 'b) Logs.msgf -> 'b
val on_error : ?level:Logs.level -> ?header:string -> ?tags:Logs.Tag.set -> pp:(Stdlib.Format.formatter -> 'b -> unit) -> use:('b -> 'a) -> ('a, 'b) Stdlib.result -> 'a
val on_error_msg : ?level:Logs.level -> ?header:string -> ?tags:Logs.Tag.set -> use:(unit -> 'a) -> ('a, [ `Msg of string ]) Stdlib.result -> 'a