You can search for identifiers within the package.
in-package search v0.2.0
module IO : IO
type addr
type handler = addr Handler.Make(IO).t
val set_level : Logs.level -> unit
val logger : handler -> handler
val debug : 'a Logs.log
val info : 'a Logs.log
val warning : 'a Logs.log
val error : 'a Logs.log