diff --git a/opentelemetry/proto/metrics/v1/metrics.proto b/opentelemetry/proto/metrics/v1/metrics.proto
index ac5a3a47..01d67f8f 100644
--- a/opentelemetry/proto/metrics/v1/metrics.proto
+++ b/opentelemetry/proto/metrics/v1/metrics.proto
@@ -100,10 +100,9 @@ message Metric {
   // Data is a list of one or more DataPoints for a single metric. Only one of the
   // following fields is used for the data, depending on the type of the metric defined
   // by MetricDescriptor.type field.
-  repeated Int64DataPoint int64_data_points = 2;
-  repeated DoubleDataPoint double_data_points = 3;
-  repeated HistogramDataPoint histogram_data_points = 4;
-  repeated SummaryDataPoint summary_data_points = 5;
+  repeated ScalarDataPoint scalar_data_points = 2;
+  repeated HistogramDataPoint histogram_data_points = 3;
+  repeated SummaryDataPoint summary_data_points = 4;
 }
 
 // Defines a metric type and its schema.
@@ -239,9 +238,9 @@ message MetricDescriptor {
   Temporality temporality = 5;
 }
 
-// Int64DataPoint is a single data point in a timeseries that describes the time-varying
-// values of a int64 metric.
-message Int64DataPoint {
+// ScalarDataPoint is a single data point in a timeseries that describes the time-varying
+// values of a int64 or double-typed metric.
+message ScalarDataPoint {
   // The set of labels that uniquely identify this timeseries.
   repeated opentelemetry.proto.common.v1.StringKeyValue labels = 1;
 
@@ -260,33 +259,11 @@ message Int64DataPoint {
   // Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970.
   fixed64 time_unix_nano = 3;
 
-  // value itself.
-  int64 value = 4;
-}
-
-// DoubleDataPoint is a single data point in a timeseries that describes the time-varying
-// value of a double metric.
-message DoubleDataPoint {
-  // The set of labels that uniquely identify this timeseries.
-  repeated opentelemetry.proto.common.v1.StringKeyValue labels = 1;
-
-  // start_time_unix_nano is the time when the cumulative value was reset to zero.
-  // This is used for Counter type only. For Gauge the value is not specified and
-  // defaults to 0.
-  //
-  // The cumulative value is over the time interval (start_time_unix_nano, time_unix_nano].
-  // Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970.
-  //
-  // Value of 0 indicates that the timestamp is unspecified. In that case the timestamp
-  // may be decided by the backend.
-  fixed64 start_time_unix_nano = 2;
-
-  // time_unix_nano is the moment when this value was recorded.
-  // Value is UNIX Epoch time in nanoseconds since 00:00:00 UTC on 1 January 1970.
-  fixed64 time_unix_nano = 3;
+  // value itself: int64 case
+  int64 value_int64 = 4;
 
-  // value itself.
-  double value = 4;
+  // value itself: double case
+  double value_double = 5;
 }
 
 // HistogramDataPoint is a single data point in a timeseries that describes the time-varying