mrproliu commented on a change in pull request #5915:
URL: https://github.com/apache/skywalking/pull/5915#discussion_r532025739



##########
File path: 
oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/dsl/SampleFamily.java
##########
@@ -233,12 +234,29 @@ public SampleFamily tag(Closure<?> cl) {
         }).toArray(Sample[]::new));
     }
 
+    /**
+     * Ignore histogram decrease bucket value, at agent side meter, need to 
ignore decrease histogram bucket value
+     */
+    public SampleFamily ignoreHistogramDecrease() {
+        this.context.ignoreHistogramDecrease = true;
+        return this;
+    }
+
+    /**
+     * Change default histogram bucket value unit,
+     * use second on the Prometheus, use millisecond on the meter side meter
+     */
+    public SampleFamily defaultHistogramBucketUnit(TimeUnit unit) {

Review comment:
       Have created `SampleFactoryBuilder` to help create `SampleFactory` with 
these two settings.




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