public void add(Long count, Long size, Long delay) {
        if (count != null) {
            this.count += count;
        }
        if (size != null) {
            this.size += size;
        }
        if (delay != null) {
            this.delay += delay;
        }
    }
Add values to statistics fields with null checks
@param count message count to add
@param size data size to add
@param delay delay time to add
inlong-audit/audit-service/src/main/java/org/apache/inlong/audit/service/entities/StatData.java