static void populateMethodDescriptorAttributes(final Map<AttributeKey<?>, Object> attributes,
    final Descriptors.MethodDescriptor md) {
    final String packageAndService = getRpcPackageAndService(md.getService());
    final String method = getRpcName(md);
    attributes.put(RPC_SYSTEM, RpcSystem.HBASE_RPC.name());
    attributes.put(RPC_SERVICE, packageAndService);
    attributes.put(RPC_METHOD, method);
  }
Static utility method that performs the primary logic of this builder. It is visible to other
classes in this package so that other builders can use this functionality as a mix-in.
@param attributes the attributes map to be populated.
@param md         the source of the RPC attribute values.
hbase-client/src/main/java/org/apache/hadoop/hbase/client/trace/IpcClientSpanBuilder.java