public Counter count(long delta, String name, MetricLevel metricLevel, String... tags) {
    Counter counter = getOrCreateCounter(name, metricLevel, tags);
    counter.inc(delta);
    return counter;
  }
Update counter. if exists, then update counter by delta. if not, then create and update.

@param delta the value to update
@param name the name of name
@param metricLevel the level of name
@param tags string pairs, like sg="ln" will be "sg", "ln"
iotdb-core/metrics/interface/src/main/java/org/apache/iotdb/metrics/AbstractMetricManager.java