@Override
  public void processedElement(String elemType, String layer, int zoom) {
    processedElements.labels(elemType, layer, String.valueOf(zoom)).inc();
  }
Returns a new {@code PrometheusStats} that and schedules it to push to {@code destination} every {@code interval}.
planetiler-core/src/main/java/com/onthegomap/planetiler/stats/PrometheusStats.java