public Builder clearStackTrace() {
      bitField0_ = (bitField0_ & ~0x00000080);
      stackTrace_ = null;
      if (stackTraceBuilder_ != null) {
        stackTraceBuilder_.dispose();
        stackTraceBuilder_ = null;
      }
      onChanged();
      return this;
    }
<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