message: fix: get net traffic value for the first time
diff: @@ -12,6 +12,7 @@ const fieldNames = ['net.in.bytes', 'net.in.packets', 'net.in.errs', 'net.in.dro
  const getEmptyFields = () => Array(16).map(() => 0);
  +
  export class NetTrafficGaugeSet extends CachedMetricSet {
  static DEFAULT_FILE_PATH = '/proc/net/dev';
  @@ -28,6 +29,8 @@ export class NetTrafficGaugeSet extends CachedMetricSet {
  let self = this;
  let gauges = [];
  + self.refreshIfNecessary();
  +
  for (const interfaceName in this.countStats) {
  let i = 0;
  for (const fieldName of fieldNames) {
  