message: [metrics] fix clippy check
diff: @@ -36,8 +36,7 @@ impl ProcessCollector {
  )
  .unwrap();
  let cpu_usage = Gauge::with_opts(
  - Opts::new("process_cpu_usage", "Total user and system CPU time")
  - .namespace(namespace.clone()),
  + Opts::new("process_cpu_usage", "Total user and system CPU time").namespace(namespace),
  )
  .unwrap();
  let mut descs = vec![];
  