public com.google.devtools.cloudtrace.v2.StackTrace.StackFrame.Builder addFrameBuilder(
          int index) {
        return getFrameFieldBuilder()
            .addBuilder(
                index,
                com.google.devtools.cloudtrace.v2.StackTrace.StackFrame.getDefaultInstance());
      }
<pre>
Stack frames in this call stack.
</pre>

<code>repeated .google.devtools.cloudtrace.v2.StackTrace.StackFrame frame = 1;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/StackTrace.java