class Puma::ThreadPool

def stats
  with_mutex do
    temp = @backlog_max
    @backlog_max = 0
    { backlog: @todo.size,
      running: @spawned,
      pool_capacity: @waiting + (@max - @spawned),
      busy_threads: @spawned - @waiting + @todo.size,
      backlog_max: temp
    }
  end
end