private com.google.protobuf.SingleFieldBuilderV3<
              com.google.storagetransfer.v1.proto.TransferTypes.TransferCounters,
              com.google.storagetransfer.v1.proto.TransferTypes.TransferCounters.Builder,
              com.google.storagetransfer.v1.proto.TransferTypes.TransferCountersOrBuilder>
          getCountersFieldBuilder() {
        if (countersBuilder_ == null) {
          countersBuilder_ =
              new com.google.protobuf.SingleFieldBuilderV3<
                  com.google.storagetransfer.v1.proto.TransferTypes.TransferCounters,
                  com.google.storagetransfer.v1.proto.TransferTypes.TransferCounters.Builder,
                  com.google.storagetransfer.v1.proto.TransferTypes.TransferCountersOrBuilder>(
                  getCounters(), getParentForChildren(), isClean());
          counters_ = null;
        }
        return countersBuilder_;
      }
<pre>
Information about the progress of the transfer operation.
</pre>

<code>.google.storagetransfer.v1.TransferCounters counters = 7;</code>
java-storage-transfer/proto-google-cloud-storage-transfer-v1/src/main/java/com/google/storagetransfer/v1/proto/TransferTypes.java