class ElasticAPM::Metrics::CpuMem::Sample

def delta(previous)
  dup.tap do |sample|
    sample.system_cpu_total =
      system_cpu_total - previous.system_cpu_total
    sample.system_cpu_usage =
      system_cpu_usage - previous.system_cpu_usage
    sample.process_cpu_usage =
      process_cpu_usage - previous.process_cpu_usage
  end
end