public static Builder newBuilder(
          com.google.devtools.cloudtrace.v2.Span.TimeEvent.MessageEvent prototype) {
        return DEFAULT_INSTANCE.toBuilder().mergeFrom(prototype);
      }
<pre>
The number of compressed bytes sent or received. If missing, the
compressed size is assumed to be the same size as the uncompressed
size.
</pre>

<code>int64 compressed_size_bytes = 4;</code>

@return The compressedSizeBytes.
java-trace/proto-google-cloud-trace-v2/src/main/java/com/google/devtools/cloudtrace/v2/Span.java