module Cpu_usage: Cpu_usageval samples : unit -> float Import.Pipe.Reader.t
    Pushback is not honored on the pipe and the pipe will grow unbounded in memory if it
    is not read from.
module Summary:sig..end
val summaries : windows:Core.Std.Time.Span.t list ->
       (Core.Std.Time.Span.t * Summary.t) Import.Pipe.Reader.t
    Pushback is not honored on the pipe and the pipe will grow unbounded in memory if it
    is not read from.