@java.lang.Override
  public com.google.devtools.cloudtrace.v2.StackTraceOrBuilder getStackTraceOrBuilder() {
    return stackTrace_ == null
        ? com.google.devtools.cloudtrace.v2.StackTrace.getDefaultInstance()
        : stackTrace_;
  }
<pre>
Stack trace captured at the start of the span.
</pre>

<code>.google.devtools.cloudtrace.v2.StackTrace stack_trace = 8;</code>
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java