code: private synchronized void sendCurrentConfig() {
      // Bouncing back CurrentLibraryConfig to Agent.
      io.opencensus.proto.trace.v1.TraceConfig currentTraceConfigProto =
          TraceProtoUtils.getCurrentTraceConfig(traceConfig);
      CurrentLibraryConfig currentLibraryConfig =
          CurrentLibraryConfig.newBuilder().setConfig(currentTraceConfigProto).build();
      sendCurrentConfig(currentLibraryConfig);
    }
docs: Follow up after applying the updated library config.