private static ImmutableMap<String, String> groupByExcludedLabel(final String excludedLabelKey, final Sample sample) {
            return sample
                    .labels
                    .entrySet()
                    .stream()
                    .filter(v -> !v.getKey().equals(excludedLabelKey))
                    .collect(toImmutableMap(Map.Entry::getKey, Map.Entry::getValue));
        }
The parsing context holds key results more than sample collection.
oap-server/analyzer/meter-analyzer/src/main/java/org/apache/skywalking/oap/meter/analyzer/dsl/SampleFamily.java