message: [metrics] update metrics log level to debug
diff: @@ -100,7 +100,7 @@ pub fn push_metrics(push_server_url: String, auth_username: Option<String>, auth
  ) {
  Ok(_) => {}
  Err(e) => {
  - error!("push metrics error: {:?}", e);
  + debug!("push metrics error: {:?}", e);
  }
  };
  }
  