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diff --git a/vendor/go.opencensus.io/metric/metricdata/metric.go b/vendor/go.opencensus.io/metric/metricdata/metric.go
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+// Copyright 2018, OpenCensus Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metricdata
+
+import (
+ "time"
+
+ "go.opencensus.io/resource"
+)
+
+// Descriptor holds metadata about a metric.
+type Descriptor struct {
+ Name string // full name of the metric
+ Description string // human-readable description
+ Unit Unit // units for the measure
+ Type Type // type of measure
+ LabelKeys []LabelKey // label keys
+}
+
+// Metric represents a quantity measured against a resource with different
+// label value combinations.
+type Metric struct {
+ Descriptor Descriptor // metric descriptor
+ Resource *resource.Resource // resource against which this was measured
+ TimeSeries []*TimeSeries // one time series for each combination of label values
+}
+
+// TimeSeries is a sequence of points associated with a combination of label
+// values.
+type TimeSeries struct {
+ LabelValues []LabelValue // label values, same order as keys in the metric descriptor
+ Points []Point // points sequence
+ StartTime time.Time // time we started recording this time series
+}