message: [fmt]: fix unused
diff: @@ -26,12 +26,12 @@ impl ConfigModule for MetricsConfig {
  Self::default()
  }
  - fn random(&mut self, base: &BaseConfig) {
  + fn random(&mut self, _base: &BaseConfig) {
  let port = get_available_port();
  self.metrics_server_port = port;
  }
  - fn load(&mut self, base: &BaseConfig, _opt: &StarcoinOpt) -> Result<()> {
  + fn load(&mut self, _base: &BaseConfig, _opt: &StarcoinOpt) -> Result<()> {
  Ok(())
  }
  }
  