message: feat: remove metricsLevel and use normal level
diff: @@ -69,31 +69,6 @@ The most common are the key and the tags.
  The key is a normal string, joined by few strings with the separator dot(.), and the tags is a K/V object. the key and the tags identified a unique Metric.
  -And another part is the MetricsLevel, Different MetricsLevel corresponds to different indicator cache times, the default time is as follows, and the unit is seconds.
  -
  -
  -```javascript
  - getCachedTimeForLevel(level: MetricLevel) {
  -
  - switch (level) {
  - case MetricLevel.TRIVIAL:
  - return 50;
  - case MetricLevel.MINOR:
  - return 20;
  - case MetricLevel.NORMAL:
  - return 10;
  - case MetricLevel.MAJOR:
  - return 2;
  - case MetricLevel.CRITICAL:
  - return 1;
  - default:
  - return 50;
  - }
  - }
  -```
  -
  -That also means, if your MetricsLevel is `MetricLevel.MAJOR`, then the cache time is seconds. If your acquisition interval is 1 second, then the value returned in both the acquisition windows is the same.
  -
  ## Measurement type
  