final int numMetrics = in.readRawVarint32();
List<Metric> metrics = new ArrayList<Metric>(numMetrics);
for (int i = 0; i < numMetrics; i++) {
String tenantId = in.readString();
String metricName = in.readString();
DataType type = new DataType(in.readString());
long collectionTime = in.readRawVarint64();
int ttlSecs = in.readRawVarint32();
String units = in.readString();