ReplicatedSize:  totReplicatedSize,
		ReplicatedCount: totReplicatedCount,
		Failed:          totFailed.toMetric(),
	}

	var qs ReplicationQueueStats
	for _, bs := range bucketStats {
		qs.Nodes = append(qs.Nodes, bs.QueueStats.Nodes...)
	}
	qs.Uptime = UTCNow().Unix() - globalBootTime.Unix()

	var ps ProxyMetric
	for _, bs := range bucketStats {
		ps.add(bs.ProxyStats)
	}
	bs = BucketStats{

  const char* op_name_ = nullptr;
  // TODO(srbs): Use this.
  string device_name_;
};

// GraphContext wraps a TF_Graph modeling a single function and manages the
// "execution" of operation, i.e. adding them to the function.
class GraphContext : public TracingContext {
 public:
  explicit GraphContext(const char* name)
      : TracingContext(kGraph),
        graph_(new TF_Graph(), TF_DeleteGraph),

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