private static void annotateHeapBytesRead(AttributesBuilder attributesBuilder,
    int heapBytesRead) {
    annotateBytesRead(attributesBuilder, 0, heapBytesRead);
  }
Conditionally annotate {@code span} with the appropriate attribute when value is non-zero.
hbase-common/src/main/java/org/apache/hadoop/hbase/io/util/BlockIOUtils.java