private String parseHistogramBucket(MeterBucketValue bucketValue) {
        if (bucketValue.getIsNegativeInfinity()) {
            return String.valueOf(Long.MIN_VALUE);
        } else {
            return String.valueOf(bucketValue.getBucket());
        }
    }
Process all of meters and send to meter system.
oap-server/analyzer/agent-analyzer/src/main/java/org/apache/skywalking/oap/server/analyzer/provider/meter/process/MeterProcessor.java