code: func (t *Tags) Stat(send helper.StatCallback) {
  	helper.SendAndSubstractUint32("queuePutErrors", &t.q.stat.putErrors, send)
  	helper.SendAndSubstractUint32("queuePutCount", &t.q.stat.putCount, send)
  	helper.SendAndSubstractUint32("queueDeleteErrors", &t.q.stat.deleteErrors, send)
  	helper.SendAndSubstractUint32("queueDeleteCount", &t.q.stat.deleteCount, send)
  	helper.SendAndSubstractUint32("tagdbSendFail", &t.q.stat.sendFail, send)
  	helper.SendAndSubstractUint32("tagdbSendSuccess", &t.q.stat.sendSuccess, send)
  
  	send("queueLag", t.q.Lag().Seconds())
  }
docs: // Collect metrics