class RuboCop::Cop::Performance::ConcurrentMonotonicTime

def on_send(node)
  return unless concurrent_monotonic_time?(node)
  optional_unit_parameter = ", #{node.first_argument.source}" if node.first_argument
  prefer = "Process.clock_gettime(Process::CLOCK_MONOTONIC#{optional_unit_parameter})"
  message = format(MSG, prefer: prefer, current: node.source)
  add_offense(node, message: message) do |corrector|
    corrector.replace(node, prefer)
  end
end