You can search for identifiers within the package.
in-package search v0.2.0
module Simple : sig ... end
val starting_gc : string -> unit Lwt.t
val finished_gc : string -> unit Lwt.t
val ignore_gc : string -> unit Lwt.t
val failed_gc : string -> Tezos_base.TzPervasives.tztrace -> unit Lwt.t
val missing_value_gc : string -> string -> unit Lwt.t