Rename Kind from the api/metric package (#1240)

* Update metric Kind to InstrumentKind

* Update all the other modules with Kind rename

* Update metric Descriptor with instrument Kind rename

* Update other modules with Descriptor method rename

* Update OTLP exporter test field name

* Rename kind filenames

* Add changes to CHANGELOG

* Fix documentation for Grouping and PrecomputedSum

CHANGELOG.md

@@ -18,6 +18,9 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 - Move the `go.opentelemetry.io/otel/api/trace/tracetest` package into `go.opentelemetry.io/otel/oteltest`. (#1229)
 - OTLP Exporter supports OTLP v0.5.0. (#1230)
 - The Sampler is now called on local child spans. (#1233)
+- The `Kind` type from the `go.opentelemetry.io/otel/api/metric` package was renamed to `InstrumentKind` to more specifically describe what it is and avoid semantic ambiguity. (#1240)
+- The `MetricKind` method of the `Descriptor` type in the `go.opentelemetry.io/otel/api/metric` package was renamed to `Descriptor.InstrumentKind`.
+   This matches the returned type and fixes misuse of the term metric. (#1240)
 - Move test harness from the `go.opentelemetry.io/otel/api/apitest` package into `go.opentelemetry.io/otel/oteltest`. (#1241)
 - Rename `MergeItererator` to `MergeIterator` in the `go.opentelemetry.io/otel/label` package. (#1244)
 

api/metric/api_test.go

@@ -32,7 +32,7 @@ import (
 
 var Must = metric.Must
 
-func checkSyncBatches(ctx context.Context, t *testing.T, labels []label.KeyValue, mock *mockTest.MeterImpl, nkind metric.NumberKind, mkind metric.Kind, instrument metric.InstrumentImpl, expected ...float64) {
+func checkSyncBatches(ctx context.Context, t *testing.T, labels []label.KeyValue, mock *mockTest.MeterImpl, nkind metric.NumberKind, mkind metric.InstrumentKind, instrument metric.InstrumentImpl, expected ...float64) {
 	t.Helper()
 
 	batchesCount := len(mock.MeasurementBatches)
@@ -131,7 +131,7 @@ func TestCounter(t *testing.T) {
 		boundInstrument := c.Bind(labels...)
 		boundInstrument.Add(ctx, -742)
 		meter.RecordBatch(ctx, labels, c.Measurement(42))
-		checkSyncBatches(ctx, t, labels, mockSDK, metric.Float64NumberKind, metric.CounterKind, c.SyncImpl(),
+		checkSyncBatches(ctx, t, labels, mockSDK, metric.Float64NumberKind, metric.CounterInstrumentKind, c.SyncImpl(),
 			1994.1, -742, 42,
 		)
 	})
@@ -144,7 +144,7 @@ func TestCounter(t *testing.T) {
 		boundInstrument := c.Bind(labels...)
 		boundInstrument.Add(ctx, 4200)
 		meter.RecordBatch(ctx, labels, c.Measurement(420000))
-		checkSyncBatches(ctx, t, labels, mockSDK, metric.Int64NumberKind, metric.CounterKind, c.SyncImpl(),
+		checkSyncBatches(ctx, t, labels, mockSDK, metric.Int64NumberKind, metric.CounterInstrumentKind, c.SyncImpl(),
 			42, 4200, 420000,
 		)
 
@@ -158,7 +158,7 @@ func TestCounter(t *testing.T) {
 		boundInstrument := c.Bind(labels...)
 		boundInstrument.Add(ctx, -100)
 		meter.RecordBatch(ctx, labels, c.Measurement(42))
-		checkSyncBatches(ctx, t, labels, mockSDK, metric.Int64NumberKind, metric.UpDownCounterKind, c.SyncImpl(),
+		checkSyncBatches(ctx, t, labels, mockSDK, metric.Int64NumberKind, metric.UpDownCounterInstrumentKind, c.SyncImpl(),
 			100, -100, 42,
 		)
 	})
@@ -171,7 +171,7 @@ func TestCounter(t *testing.T) {
 		boundInstrument := c.Bind(labels...)
 		boundInstrument.Add(ctx, -76)
 		meter.RecordBatch(ctx, labels, c.Measurement(-100.1))
-		checkSyncBatches(ctx, t, labels, mockSDK, metric.Float64NumberKind, metric.UpDownCounterKind, c.SyncImpl(),
+		checkSyncBatches(ctx, t, labels, mockSDK, metric.Float64NumberKind, metric.UpDownCounterInstrumentKind, c.SyncImpl(),
 			100.1, -76, -100.1,
 		)
 	})
@@ -187,7 +187,7 @@ func TestValueRecorder(t *testing.T) {
 		boundInstrument := m.Bind(labels...)
 		boundInstrument.Record(ctx, 0)
 		meter.RecordBatch(ctx, labels, m.Measurement(-100.5))
-		checkSyncBatches(ctx, t, labels, mockSDK, metric.Float64NumberKind, metric.ValueRecorderKind, m.SyncImpl(),
+		checkSyncBatches(ctx, t, labels, mockSDK, metric.Float64NumberKind, metric.ValueRecorderInstrumentKind, m.SyncImpl(),
 			42, 0, -100.5,
 		)
 	})
@@ -200,7 +200,7 @@ func TestValueRecorder(t *testing.T) {
 		boundInstrument := m.Bind(labels...)
 		boundInstrument.Record(ctx, 80)
 		meter.RecordBatch(ctx, labels, m.Measurement(0))
-		checkSyncBatches(ctx, t, labels, mockSDK, metric.Int64NumberKind, metric.ValueRecorderKind, m.SyncImpl(),
+		checkSyncBatches(ctx, t, labels, mockSDK, metric.Int64NumberKind, metric.ValueRecorderInstrumentKind, m.SyncImpl(),
 			173, 80, 0,
 		)
 	})
@@ -214,7 +214,7 @@ func TestObserverInstruments(t *testing.T) {
 			result.Observe(42.1, labels...)
 		})
 		mockSDK.RunAsyncInstruments()
-		checkObserverBatch(t, labels, mockSDK, metric.Float64NumberKind, metric.ValueObserverKind, o.AsyncImpl(),
+		checkObserverBatch(t, labels, mockSDK, metric.Float64NumberKind, metric.ValueObserverInstrumentKind, o.AsyncImpl(),
 			42.1,
 		)
 	})
@@ -225,7 +225,7 @@ func TestObserverInstruments(t *testing.T) {
 			result.Observe(-142, labels...)
 		})
 		mockSDK.RunAsyncInstruments()
-		checkObserverBatch(t, labels, mockSDK, metric.Int64NumberKind, metric.ValueObserverKind, o.AsyncImpl(),
+		checkObserverBatch(t, labels, mockSDK, metric.Int64NumberKind, metric.ValueObserverInstrumentKind, o.AsyncImpl(),
 			-142,
 		)
 	})
@@ -236,7 +236,7 @@ func TestObserverInstruments(t *testing.T) {
 			result.Observe(42.1, labels...)
 		})
 		mockSDK.RunAsyncInstruments()
-		checkObserverBatch(t, labels, mockSDK, metric.Float64NumberKind, metric.SumObserverKind, o.AsyncImpl(),
+		checkObserverBatch(t, labels, mockSDK, metric.Float64NumberKind, metric.SumObserverInstrumentKind, o.AsyncImpl(),
 			42.1,
 		)
 	})
@@ -247,7 +247,7 @@ func TestObserverInstruments(t *testing.T) {
 			result.Observe(-142, labels...)
 		})
 		mockSDK.RunAsyncInstruments()
-		checkObserverBatch(t, labels, mockSDK, metric.Int64NumberKind, metric.SumObserverKind, o.AsyncImpl(),
+		checkObserverBatch(t, labels, mockSDK, metric.Int64NumberKind, metric.SumObserverInstrumentKind, o.AsyncImpl(),
 			-142,
 		)
 	})
@@ -258,7 +258,7 @@ func TestObserverInstruments(t *testing.T) {
 			result.Observe(42.1, labels...)
 		})
 		mockSDK.RunAsyncInstruments()
-		checkObserverBatch(t, labels, mockSDK, metric.Float64NumberKind, metric.UpDownSumObserverKind, o.AsyncImpl(),
+		checkObserverBatch(t, labels, mockSDK, metric.Float64NumberKind, metric.UpDownSumObserverInstrumentKind, o.AsyncImpl(),
 			42.1,
 		)
 	})
@@ -269,7 +269,7 @@ func TestObserverInstruments(t *testing.T) {
 			result.Observe(-142, labels...)
 		})
 		mockSDK.RunAsyncInstruments()
-		checkObserverBatch(t, labels, mockSDK, metric.Int64NumberKind, metric.UpDownSumObserverKind, o.AsyncImpl(),
+		checkObserverBatch(t, labels, mockSDK, metric.Int64NumberKind, metric.UpDownSumObserverInstrumentKind, o.AsyncImpl(),
 			-142,
 		)
 	})
@@ -320,7 +320,7 @@ func TestBatchObserverInstruments(t *testing.T) {
 	require.Equal(t, 0, m2.Number.CompareNumber(metric.Float64NumberKind, mockTest.ResolveNumberByKind(t, metric.Float64NumberKind, 42)))
 }
 
-func checkObserverBatch(t *testing.T, labels []label.KeyValue, mock *mockTest.MeterImpl, nkind metric.NumberKind, mkind metric.Kind, observer metric.AsyncImpl, expected float64) {
+func checkObserverBatch(t *testing.T, labels []label.KeyValue, mock *mockTest.MeterImpl, nkind metric.NumberKind, mkind metric.InstrumentKind, observer metric.AsyncImpl, expected float64) {
 	t.Helper()
 	assert.Len(t, mock.MeasurementBatches, 1)
 	if len(mock.MeasurementBatches) < 1 {
@@ -337,7 +337,7 @@ func checkObserverBatch(t *testing.T, labels []label.KeyValue, mock *mockTest.Me
 		return
 	}
 	measurement := got.Measurements[0]
-	require.Equal(t, mkind, measurement.Instrument.Descriptor().MetricKind())
+	require.Equal(t, mkind, measurement.Instrument.Descriptor().InstrumentKind())
 	assert.Equal(t, o, measurement.Instrument.Implementation().(*mockTest.Async))
 	ft := mockTest.ResolveNumberByKind(t, nkind, expected)
 	assert.Equal(t, 0, measurement.Number.CompareNumber(nkind, ft))

api/metric/descriptor.go

@@ -20,19 +20,19 @@ import "go.opentelemetry.io/otel/unit"
 // including its name, metric kind, number kind, and the configurable
 // options.
 type Descriptor struct {
-	name       string
-	kind       Kind
-	numberKind NumberKind
-	config     InstrumentConfig
+	name           string
+	instrumentKind InstrumentKind
+	numberKind     NumberKind
+	config         InstrumentConfig
 }
 
 // NewDescriptor returns a Descriptor with the given contents.
-func NewDescriptor(name string, mkind Kind, nkind NumberKind, opts ...InstrumentOption) Descriptor {
+func NewDescriptor(name string, ikind InstrumentKind, nkind NumberKind, opts ...InstrumentOption) Descriptor {
 	return Descriptor{
-		name:       name,
-		kind:       mkind,
-		numberKind: nkind,
-		config:     NewInstrumentConfig(opts...),
+		name:           name,
+		instrumentKind: ikind,
+		numberKind:     nkind,
+		config:         NewInstrumentConfig(opts...),
 	}
 }
 
@@ -41,9 +41,9 @@ func (d Descriptor) Name() string {
 	return d.name
 }
 
-// MetricKind returns the specific kind of instrument.
-func (d Descriptor) MetricKind() Kind {
-	return d.kind
+// InstrumentKind returns the specific kind of instrument.
+func (d Descriptor) InstrumentKind() InstrumentKind {
+	return d.instrumentKind
 }
 
 // Description provides a human-readable description of the metric

api/metric/instrumentkind.go

@@ -0,0 +1,80 @@
+// Copyright The OpenTelemetry 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.
+
+//go:generate stringer -type=InstrumentKind
+
+package metric
+
+// InstrumentKind describes the kind of instrument.
+type InstrumentKind int8
+
+const (
+	// ValueRecorderInstrumentKind indicates a ValueRecorder instrument.
+	ValueRecorderInstrumentKind InstrumentKind = iota
+	// ValueObserverInstrumentKind indicates an ValueObserver instrument.
+	ValueObserverInstrumentKind
+
+	// CounterInstrumentKind indicates a Counter instrument.
+	CounterInstrumentKind
+	// UpDownCounterInstrumentKind indicates a UpDownCounter instrument.
+	UpDownCounterInstrumentKind
+
+	// SumObserverInstrumentKind indicates a SumObserver instrument.
+	SumObserverInstrumentKind
+	// UpDownSumObserverInstrumentKind indicates a UpDownSumObserver
+	// instrument.
+	UpDownSumObserverInstrumentKind
+)
+
+// Synchronous returns whether this is a synchronous kind of instrument.
+func (k InstrumentKind) Synchronous() bool {
+	switch k {
+	case CounterInstrumentKind, UpDownCounterInstrumentKind, ValueRecorderInstrumentKind:
+		return true
+	}
+	return false
+}
+
+// Asynchronous returns whether this is an asynchronous kind of instrument.
+func (k InstrumentKind) Asynchronous() bool {
+	return !k.Synchronous()
+}
+
+// Adding returns whether this kind of instrument adds its inputs (as opposed to Grouping).
+func (k InstrumentKind) Adding() bool {
+	switch k {
+	case CounterInstrumentKind, UpDownCounterInstrumentKind, SumObserverInstrumentKind, UpDownSumObserverInstrumentKind:
+		return true
+	}
+	return false
+}
+
+// Grouping returns whether this kind of instrument groups its inputs (as opposed to Adding).
+func (k InstrumentKind) Grouping() bool {
+	return !k.Adding()
+}
+
+// Monotonic returns whether this kind of instrument exposes a non-decreasing sum.
+func (k InstrumentKind) Monotonic() bool {
+	switch k {
+	case CounterInstrumentKind, SumObserverInstrumentKind:
+		return true
+	}
+	return false
+}
+
+// PrecomputedSum returns whether this kind of instrument receives precomputed sums.
+func (k InstrumentKind) PrecomputedSum() bool {
+	return k.Adding() && k.Asynchronous()
+}

api/metric/instrumentkind_string.go

@@ -0,0 +1,28 @@
+// Code generated by "stringer -type=InstrumentKind"; DO NOT EDIT.
+
+package metric
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[ValueRecorderInstrumentKind-0]
+	_ = x[ValueObserverInstrumentKind-1]
+	_ = x[CounterInstrumentKind-2]
+	_ = x[UpDownCounterInstrumentKind-3]
+	_ = x[SumObserverInstrumentKind-4]
+	_ = x[UpDownSumObserverInstrumentKind-5]
+}
+
+const _InstrumentKind_name = "ValueRecorderInstrumentKindValueObserverInstrumentKindCounterInstrumentKindUpDownCounterInstrumentKindSumObserverInstrumentKindUpDownSumObserverInstrumentKind"
+
+var _InstrumentKind_index = [...]uint8{0, 27, 54, 75, 102, 127, 158}
+
+func (i InstrumentKind) String() string {
+	if i < 0 || i >= InstrumentKind(len(_InstrumentKind_index)-1) {
+		return "InstrumentKind(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _InstrumentKind_name[_InstrumentKind_index[i]:_InstrumentKind_index[i+1]]
+}

api/metric/instrumentkind_test.go

@@ -23,49 +23,49 @@ import (
 )
 
 var (
-	syncKinds = []metric.Kind{
-		metric.ValueRecorderKind,
-		metric.CounterKind,
-		metric.UpDownCounterKind,
+	syncKinds = []metric.InstrumentKind{
+		metric.ValueRecorderInstrumentKind,
+		metric.CounterInstrumentKind,
+		metric.UpDownCounterInstrumentKind,
 	}
-	asyncKinds = []metric.Kind{
-		metric.ValueObserverKind,
-		metric.SumObserverKind,
-		metric.UpDownSumObserverKind,
+	asyncKinds = []metric.InstrumentKind{
+		metric.ValueObserverInstrumentKind,
+		metric.SumObserverInstrumentKind,
+		metric.UpDownSumObserverInstrumentKind,
 	}
-	addingKinds = []metric.Kind{
-		metric.CounterKind,
-		metric.UpDownCounterKind,
-		metric.SumObserverKind,
-		metric.UpDownSumObserverKind,
+	addingKinds = []metric.InstrumentKind{
+		metric.CounterInstrumentKind,
+		metric.UpDownCounterInstrumentKind,
+		metric.SumObserverInstrumentKind,
+		metric.UpDownSumObserverInstrumentKind,
 	}
-	groupingKinds = []metric.Kind{
-		metric.ValueRecorderKind,
-		metric.ValueObserverKind,
+	groupingKinds = []metric.InstrumentKind{
+		metric.ValueRecorderInstrumentKind,
+		metric.ValueObserverInstrumentKind,
 	}
 
-	monotonicKinds = []metric.Kind{
-		metric.CounterKind,
-		metric.SumObserverKind,
+	monotonicKinds = []metric.InstrumentKind{
+		metric.CounterInstrumentKind,
+		metric.SumObserverInstrumentKind,
 	}
 
-	nonMonotonicKinds = []metric.Kind{
-		metric.UpDownCounterKind,
-		metric.UpDownSumObserverKind,
-		metric.ValueRecorderKind,
-		metric.ValueObserverKind,
+	nonMonotonicKinds = []metric.InstrumentKind{
+		metric.UpDownCounterInstrumentKind,
+		metric.UpDownSumObserverInstrumentKind,
+		metric.ValueRecorderInstrumentKind,
+		metric.ValueObserverInstrumentKind,
 	}
 
-	precomputedSumKinds = []metric.Kind{
-		metric.SumObserverKind,
-		metric.UpDownSumObserverKind,
+	precomputedSumKinds = []metric.InstrumentKind{
+		metric.SumObserverInstrumentKind,
+		metric.UpDownSumObserverInstrumentKind,
 	}
 
-	nonPrecomputedSumKinds = []metric.Kind{
-		metric.CounterKind,
-		metric.UpDownCounterKind,
-		metric.ValueRecorderKind,
-		metric.ValueObserverKind,
+	nonPrecomputedSumKinds = []metric.InstrumentKind{
+		metric.CounterInstrumentKind,
+		metric.UpDownCounterInstrumentKind,
+		metric.ValueRecorderInstrumentKind,
+		metric.ValueObserverInstrumentKind,
 	}
 )
 

api/metric/kind.go

@@ -1,79 +0,0 @@
-// Copyright The OpenTelemetry 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.
-
-//go:generate stringer -type=Kind
-
-package metric
-
-// Kind describes the kind of instrument.
-type Kind int8
-
-const (
-	// ValueRecorderKind indicates a ValueRecorder instrument.
-	ValueRecorderKind Kind = iota
-	// ValueObserverKind indicates an ValueObserver instrument.
-	ValueObserverKind
-
-	// CounterKind indicates a Counter instrument.
-	CounterKind
-	// UpDownCounterKind indicates a UpDownCounter instrument.
-	UpDownCounterKind
-
-	// SumObserverKind indicates a SumObserver instrument.
-	SumObserverKind
-	// UpDownSumObserverKind indicates a UpDownSumObserver instrument.
-	UpDownSumObserverKind
-)
-
-// Synchronous returns whether this is a synchronous kind of instrument.
-func (k Kind) Synchronous() bool {
-	switch k {
-	case CounterKind, UpDownCounterKind, ValueRecorderKind:
-		return true
-	}
-	return false
-}
-
-// Asynchronous returns whether this is an asynchronous kind of instrument.
-func (k Kind) Asynchronous() bool {
-	return !k.Synchronous()
-}
-
-// Adding returns whether this kind of instrument adds its inputs (as opposed to Grouping).
-func (k Kind) Adding() bool {
-	switch k {
-	case CounterKind, UpDownCounterKind, SumObserverKind, UpDownSumObserverKind:
-		return true
-	}
-	return false
-}
-
-// Adding returns whether this kind of instrument groups its inputs (as opposed to Adding).
-func (k Kind) Grouping() bool {
-	return !k.Adding()
-}
-
-// Monotonic returns whether this kind of instrument exposes a non-decreasing sum.
-func (k Kind) Monotonic() bool {
-	switch k {
-	case CounterKind, SumObserverKind:
-		return true
-	}
-	return false
-}
-
-// Cumulative returns whether this kind of instrument receives precomputed sums.
-func (k Kind) PrecomputedSum() bool {
-	return k.Adding() && k.Asynchronous()
-}

api/metric/kind_string.go

@@ -1,28 +0,0 @@
-// Code generated by "stringer -type=Kind"; DO NOT EDIT.
-
-package metric
-
-import "strconv"
-
-func _() {
-	// An "invalid array index" compiler error signifies that the constant values have changed.
-	// Re-run the stringer command to generate them again.
-	var x [1]struct{}
-	_ = x[ValueRecorderKind-0]
-	_ = x[ValueObserverKind-1]
-	_ = x[CounterKind-2]
-	_ = x[UpDownCounterKind-3]
-	_ = x[SumObserverKind-4]
-	_ = x[UpDownSumObserverKind-5]
-}
-
-const _Kind_name = "ValueRecorderKindValueObserverKindCounterKindUpDownCounterKindSumObserverKindUpDownSumObserverKind"
-
-var _Kind_index = [...]uint8{0, 17, 34, 45, 62, 77, 98}
-
-func (i Kind) String() string {
-	if i < 0 || i >= Kind(len(_Kind_index)-1) {
-		return "Kind(" + strconv.FormatInt(int64(i), 10) + ")"
-	}
-	return _Kind_name[_Kind_index[i]:_Kind_index[i+1]]
-}

api/metric/meter.go

@@ -74,7 +74,7 @@ func (m Meter) NewBatchObserver(callback BatchObserverFunc) BatchObserver {
 // duplicate registration).
 func (m Meter) NewInt64Counter(name string, options ...InstrumentOption) (Int64Counter, error) {
 	return wrapInt64CounterInstrument(
-		m.newSync(name, CounterKind, Int64NumberKind, options))
+		m.newSync(name, CounterInstrumentKind, Int64NumberKind, options))
 }
 
 // NewFloat64Counter creates a new floating point Counter with the
@@ -83,7 +83,7 @@ func (m Meter) NewInt64Counter(name string, options ...InstrumentOption) (Int64C
 // duplicate registration).
 func (m Meter) NewFloat64Counter(name string, options ...InstrumentOption) (Float64Counter, error) {
 	return wrapFloat64CounterInstrument(
-		m.newSync(name, CounterKind, Float64NumberKind, options))
+		m.newSync(name, CounterInstrumentKind, Float64NumberKind, options))
 }
 
 // NewInt64UpDownCounter creates a new integer UpDownCounter instrument with the
@@ -92,7 +92,7 @@ func (m Meter) NewFloat64Counter(name string, options ...InstrumentOption) (Floa
 // duplicate registration).
 func (m Meter) NewInt64UpDownCounter(name string, options ...InstrumentOption) (Int64UpDownCounter, error) {
 	return wrapInt64UpDownCounterInstrument(
-		m.newSync(name, UpDownCounterKind, Int64NumberKind, options))
+		m.newSync(name, UpDownCounterInstrumentKind, Int64NumberKind, options))
 }
 
 // NewFloat64UpDownCounter creates a new floating point UpDownCounter with the
@@ -101,7 +101,7 @@ func (m Meter) NewInt64UpDownCounter(name string, options ...InstrumentOption) (
 // duplicate registration).
 func (m Meter) NewFloat64UpDownCounter(name string, options ...InstrumentOption) (Float64UpDownCounter, error) {
 	return wrapFloat64UpDownCounterInstrument(
-		m.newSync(name, UpDownCounterKind, Float64NumberKind, options))
+		m.newSync(name, UpDownCounterInstrumentKind, Float64NumberKind, options))
 }
 
 // NewInt64ValueRecorder creates a new integer ValueRecorder instrument with the
@@ -110,7 +110,7 @@ func (m Meter) NewFloat64UpDownCounter(name string, options ...InstrumentOption)
 // duplicate registration).
 func (m Meter) NewInt64ValueRecorder(name string, opts ...InstrumentOption) (Int64ValueRecorder, error) {
 	return wrapInt64ValueRecorderInstrument(
-		m.newSync(name, ValueRecorderKind, Int64NumberKind, opts))
+		m.newSync(name, ValueRecorderInstrumentKind, Int64NumberKind, opts))
 }
 
 // NewFloat64ValueRecorder creates a new floating point ValueRecorder with the
@@ -119,7 +119,7 @@ func (m Meter) NewInt64ValueRecorder(name string, opts ...InstrumentOption) (Int
 // duplicate registration).
 func (m Meter) NewFloat64ValueRecorder(name string, opts ...InstrumentOption) (Float64ValueRecorder, error) {
 	return wrapFloat64ValueRecorderInstrument(
-		m.newSync(name, ValueRecorderKind, Float64NumberKind, opts))
+		m.newSync(name, ValueRecorderInstrumentKind, Float64NumberKind, opts))
 }
 
 // NewInt64ValueObserver creates a new integer ValueObserver instrument
@@ -131,7 +131,7 @@ func (m Meter) NewInt64ValueObserver(name string, callback Int64ObserverFunc, op
 		return wrapInt64ValueObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapInt64ValueObserverInstrument(
-		m.newAsync(name, ValueObserverKind, Int64NumberKind, opts,
+		m.newAsync(name, ValueObserverInstrumentKind, Int64NumberKind, opts,
 			newInt64AsyncRunner(callback)))
 }
 
@@ -144,7 +144,7 @@ func (m Meter) NewFloat64ValueObserver(name string, callback Float64ObserverFunc
 		return wrapFloat64ValueObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapFloat64ValueObserverInstrument(
-		m.newAsync(name, ValueObserverKind, Float64NumberKind, opts,
+		m.newAsync(name, ValueObserverInstrumentKind, Float64NumberKind, opts,
 			newFloat64AsyncRunner(callback)))
 }
 
@@ -157,7 +157,7 @@ func (m Meter) NewInt64SumObserver(name string, callback Int64ObserverFunc, opts
 		return wrapInt64SumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapInt64SumObserverInstrument(
-		m.newAsync(name, SumObserverKind, Int64NumberKind, opts,
+		m.newAsync(name, SumObserverInstrumentKind, Int64NumberKind, opts,
 			newInt64AsyncRunner(callback)))
 }
 
@@ -170,7 +170,7 @@ func (m Meter) NewFloat64SumObserver(name string, callback Float64ObserverFunc,
 		return wrapFloat64SumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapFloat64SumObserverInstrument(
-		m.newAsync(name, SumObserverKind, Float64NumberKind, opts,
+		m.newAsync(name, SumObserverInstrumentKind, Float64NumberKind, opts,
 			newFloat64AsyncRunner(callback)))
 }
 
@@ -183,7 +183,7 @@ func (m Meter) NewInt64UpDownSumObserver(name string, callback Int64ObserverFunc
 		return wrapInt64UpDownSumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapInt64UpDownSumObserverInstrument(
-		m.newAsync(name, UpDownSumObserverKind, Int64NumberKind, opts,
+		m.newAsync(name, UpDownSumObserverInstrumentKind, Int64NumberKind, opts,
 			newInt64AsyncRunner(callback)))
 }
 
@@ -196,7 +196,7 @@ func (m Meter) NewFloat64UpDownSumObserver(name string, callback Float64Observer
 		return wrapFloat64UpDownSumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapFloat64UpDownSumObserverInstrument(
-		m.newAsync(name, UpDownSumObserverKind, Float64NumberKind, opts,
+		m.newAsync(name, UpDownSumObserverInstrumentKind, Float64NumberKind, opts,
 			newFloat64AsyncRunner(callback)))
 }
 
@@ -209,7 +209,7 @@ func (b BatchObserver) NewInt64ValueObserver(name string, opts ...InstrumentOpti
 		return wrapInt64ValueObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapInt64ValueObserverInstrument(
-		b.meter.newAsync(name, ValueObserverKind, Int64NumberKind, opts, b.runner))
+		b.meter.newAsync(name, ValueObserverInstrumentKind, Int64NumberKind, opts, b.runner))
 }
 
 // NewFloat64ValueObserver creates a new floating point ValueObserver with
@@ -221,7 +221,7 @@ func (b BatchObserver) NewFloat64ValueObserver(name string, opts ...InstrumentOp
 		return wrapFloat64ValueObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapFloat64ValueObserverInstrument(
-		b.meter.newAsync(name, ValueObserverKind, Float64NumberKind, opts,
+		b.meter.newAsync(name, ValueObserverInstrumentKind, Float64NumberKind, opts,
 			b.runner))
 }
 
@@ -234,7 +234,7 @@ func (b BatchObserver) NewInt64SumObserver(name string, opts ...InstrumentOption
 		return wrapInt64SumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapInt64SumObserverInstrument(
-		b.meter.newAsync(name, SumObserverKind, Int64NumberKind, opts, b.runner))
+		b.meter.newAsync(name, SumObserverInstrumentKind, Int64NumberKind, opts, b.runner))
 }
 
 // NewFloat64SumObserver creates a new floating point SumObserver with
@@ -246,7 +246,7 @@ func (b BatchObserver) NewFloat64SumObserver(name string, opts ...InstrumentOpti
 		return wrapFloat64SumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapFloat64SumObserverInstrument(
-		b.meter.newAsync(name, SumObserverKind, Float64NumberKind, opts,
+		b.meter.newAsync(name, SumObserverInstrumentKind, Float64NumberKind, opts,
 			b.runner))
 }
 
@@ -259,7 +259,7 @@ func (b BatchObserver) NewInt64UpDownSumObserver(name string, opts ...Instrument
 		return wrapInt64UpDownSumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapInt64UpDownSumObserverInstrument(
-		b.meter.newAsync(name, UpDownSumObserverKind, Int64NumberKind, opts, b.runner))
+		b.meter.newAsync(name, UpDownSumObserverInstrumentKind, Int64NumberKind, opts, b.runner))
 }
 
 // NewFloat64UpDownSumObserver creates a new floating point UpDownSumObserver with
@@ -271,7 +271,7 @@ func (b BatchObserver) NewFloat64UpDownSumObserver(name string, opts ...Instrume
 		return wrapFloat64UpDownSumObserverInstrument(NoopAsync{}, nil)
 	}
 	return wrapFloat64UpDownSumObserverInstrument(
-		b.meter.newAsync(name, UpDownSumObserverKind, Float64NumberKind, opts,
+		b.meter.newAsync(name, UpDownSumObserverInstrumentKind, Float64NumberKind, opts,
 			b.runner))
 }
 
@@ -283,7 +283,7 @@ func (m Meter) MeterImpl() MeterImpl {
 // newAsync constructs one new asynchronous instrument.
 func (m Meter) newAsync(
 	name string,
-	mkind Kind,
+	mkind InstrumentKind,
 	nkind NumberKind,
 	opts []InstrumentOption,
 	runner AsyncRunner,
@@ -303,7 +303,7 @@ func (m Meter) newAsync(
 // newSync constructs one new synchronous instrument.
 func (m Meter) newSync(
 	name string,
-	metricKind Kind,
+	metricKind InstrumentKind,
 	numberKind NumberKind,
 	opts []InstrumentOption,
 ) (

api/metric/registry/registry.go

@@ -95,14 +95,14 @@ func NewMetricKindMismatchError(desc metric.Descriptor) error {
 		desc.InstrumentationName(),
 		desc.InstrumentationVersion(),
 		desc.NumberKind(),
-		desc.MetricKind(),
+		desc.InstrumentKind(),
 		ErrMetricKindMismatch)
 }
 
 // Compatible determines whether two metric.Descriptors are considered
 // the same for the purpose of uniqueness checking.
 func Compatible(candidate, existing metric.Descriptor) bool {
-	return candidate.MetricKind() == existing.MetricKind() &&
+	return candidate.InstrumentKind() == existing.InstrumentKind() &&
 		candidate.NumberKind() == existing.NumberKind()
 }
 

exporters/otlp/internal/transform/metric_test.go

@@ -117,7 +117,7 @@ func TestMinMaxSumCountValue(t *testing.T) {
 }
 
 func TestMinMaxSumCountDatapoints(t *testing.T) {
-	desc := metric.NewDescriptor("", metric.ValueRecorderKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("", metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
 	labels := label.NewSet()
 	mmsc, ckpt := metrictest.Unslice2(minmaxsumcount.New(2, &desc))
 
@@ -156,7 +156,7 @@ func TestMinMaxSumCountPropagatesErrors(t *testing.T) {
 }
 
 func TestSumIntDataPoints(t *testing.T) {
-	desc := metric.NewDescriptor("", metric.ValueRecorderKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("", metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
 	labels := label.NewSet()
 	s, ckpt := metrictest.Unslice2(sumAgg.New(2))
 	assert.NoError(t, s.Update(context.Background(), metric.Number(1), &desc))
@@ -181,7 +181,7 @@ func TestSumIntDataPoints(t *testing.T) {
 }
 
 func TestSumFloatDataPoints(t *testing.T) {
-	desc := metric.NewDescriptor("", metric.ValueRecorderKind, metric.Float64NumberKind)
+	desc := metric.NewDescriptor("", metric.ValueRecorderInstrumentKind, metric.Float64NumberKind)
 	labels := label.NewSet()
 	s, ckpt := metrictest.Unslice2(sumAgg.New(2))
 	assert.NoError(t, s.Update(context.Background(), metric.NewFloat64Number(1), &desc))
@@ -207,7 +207,7 @@ func TestSumFloatDataPoints(t *testing.T) {
 }
 
 func TestLastValueIntDataPoints(t *testing.T) {
-	desc := metric.NewDescriptor("", metric.ValueRecorderKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("", metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
 	labels := label.NewSet()
 	s, ckpt := metrictest.Unslice2(lvAgg.New(2))
 	assert.NoError(t, s.Update(context.Background(), metric.Number(100), &desc))
@@ -233,7 +233,7 @@ func TestLastValueIntDataPoints(t *testing.T) {
 }
 
 func TestSumErrUnknownValueType(t *testing.T) {
-	desc := metric.NewDescriptor("", metric.ValueRecorderKind, metric.NumberKind(-1))
+	desc := metric.NewDescriptor("", metric.ValueRecorderInstrumentKind, metric.NumberKind(-1))
 	labels := label.NewSet()
 	s := &sumAgg.New(1)[0]
 	record := export.NewRecord(&desc, &labels, nil, s, intervalStart, intervalEnd)
@@ -318,7 +318,7 @@ var _ aggregation.MinMaxSumCount = &testErrMinMaxSumCount{}
 
 func TestRecordAggregatorIncompatibleErrors(t *testing.T) {
 	makeMpb := func(kind aggregation.Kind, agg aggregation.Aggregation) (*metricpb.Metric, error) {
-		desc := metric.NewDescriptor("things", metric.CounterKind, metric.Int64NumberKind)
+		desc := metric.NewDescriptor("things", metric.CounterInstrumentKind, metric.Int64NumberKind)
 		labels := label.NewSet()
 		res := resource.New()
 		test := &testAgg{
@@ -355,7 +355,7 @@ func TestRecordAggregatorIncompatibleErrors(t *testing.T) {
 
 func TestRecordAggregatorUnexpectedErrors(t *testing.T) {
 	makeMpb := func(kind aggregation.Kind, agg aggregation.Aggregation) (*metricpb.Metric, error) {
-		desc := metric.NewDescriptor("things", metric.CounterKind, metric.Int64NumberKind)
+		desc := metric.NewDescriptor("things", metric.CounterInstrumentKind, metric.Int64NumberKind)
 		labels := label.NewSet()
 		res := resource.New()
 		return Record(export.NewRecord(&desc, &labels, res, agg, intervalStart, intervalEnd))

exporters/otlp/otlp_integration_test.go

@@ -130,22 +130,22 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlp.ExporterOption)
 	labels := []label.KeyValue{label.Bool("test", true)}
 
 	type data struct {
-		iKind metric.Kind
+		iKind metric.InstrumentKind
 		nKind metricapi.NumberKind
 		val   int64
 	}
 	instruments := map[string]data{
-		"test-int64-counter":         {metric.CounterKind, metricapi.Int64NumberKind, 1},
-		"test-float64-counter":       {metric.CounterKind, metricapi.Float64NumberKind, 1},
-		"test-int64-valuerecorder":   {metric.ValueRecorderKind, metricapi.Int64NumberKind, 2},
-		"test-float64-valuerecorder": {metric.ValueRecorderKind, metricapi.Float64NumberKind, 2},
-		"test-int64-valueobserver":   {metric.ValueObserverKind, metricapi.Int64NumberKind, 3},
-		"test-float64-valueobserver": {metric.ValueObserverKind, metricapi.Float64NumberKind, 3},
+		"test-int64-counter":         {metric.CounterInstrumentKind, metricapi.Int64NumberKind, 1},
+		"test-float64-counter":       {metric.CounterInstrumentKind, metricapi.Float64NumberKind, 1},
+		"test-int64-valuerecorder":   {metric.ValueRecorderInstrumentKind, metricapi.Int64NumberKind, 2},
+		"test-float64-valuerecorder": {metric.ValueRecorderInstrumentKind, metricapi.Float64NumberKind, 2},
+		"test-int64-valueobserver":   {metric.ValueObserverInstrumentKind, metricapi.Int64NumberKind, 3},
+		"test-float64-valueobserver": {metric.ValueObserverInstrumentKind, metricapi.Float64NumberKind, 3},
 	}
 	for name, data := range instruments {
 		data := data
 		switch data.iKind {
-		case metric.CounterKind:
+		case metric.CounterInstrumentKind:
 			switch data.nKind {
 			case metricapi.Int64NumberKind:
 				metricapi.Must(meter).NewInt64Counter(name).Add(ctx, data.val, labels...)
@@ -154,7 +154,7 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlp.ExporterOption)
 			default:
 				assert.Failf(t, "unsupported number testing kind", data.nKind.String())
 			}
-		case metric.ValueRecorderKind:
+		case metric.ValueRecorderInstrumentKind:
 			switch data.nKind {
 			case metricapi.Int64NumberKind:
 				metricapi.Must(meter).NewInt64ValueRecorder(name).Record(ctx, data.val, labels...)
@@ -163,7 +163,7 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlp.ExporterOption)
 			default:
 				assert.Failf(t, "unsupported number testing kind", data.nKind.String())
 			}
-		case metric.ValueObserverKind:
+		case metric.ValueObserverInstrumentKind:
 			switch data.nKind {
 			case metricapi.Int64NumberKind:
 				metricapi.Must(meter).NewInt64ValueObserver(name,
@@ -245,7 +245,7 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlp.ExporterOption)
 		seen[m.Name] = struct{}{}
 
 		switch data.iKind {
-		case metric.CounterKind:
+		case metric.CounterInstrumentKind:
 			switch data.nKind {
 			case metricapi.Int64NumberKind:
 				if dp := m.GetIntSum().DataPoints; assert.Len(t, dp, 1) {
@@ -258,7 +258,7 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlp.ExporterOption)
 			default:
 				assert.Failf(t, "invalid number kind", data.nKind.String())
 			}
-		case metric.ValueObserverKind:
+		case metric.ValueObserverInstrumentKind:
 			switch data.nKind {
 			case metricapi.Int64NumberKind:
 				if dp := m.GetIntGauge().DataPoints; assert.Len(t, dp, 1) {
@@ -271,7 +271,7 @@ func newExporterEndToEndTest(t *testing.T, additionalOpts []otlp.ExporterOption)
 			default:
 				assert.Failf(t, "invalid number kind", data.nKind.String())
 			}
-		case metric.ValueRecorderKind:
+		case metric.ValueRecorderInstrumentKind:
 			switch data.nKind {
 			case metricapi.Int64NumberKind:
 				assert.NotNil(t, m.GetIntHistogram())

exporters/otlp/otlp_metric_test.go

@@ -93,7 +93,7 @@ func (m *checkpointSet) ForEach(_ metricsdk.ExportKindSelector, fn func(metricsd
 
 type record struct {
 	name     string
-	mKind    metric.Kind
+	iKind    metric.InstrumentKind
 	nKind    metric.NumberKind
 	resource *resource.Resource
 	opts     []metric.InstrumentOption
@@ -162,7 +162,7 @@ func TestNoGroupingExport(t *testing.T) {
 		[]record{
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				nil,
 				nil,
@@ -170,7 +170,7 @@ func TestNoGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				nil,
 				nil,
@@ -217,7 +217,7 @@ func TestNoGroupingExport(t *testing.T) {
 func TestValuerecorderMetricGroupingExport(t *testing.T) {
 	r := record{
 		"valuerecorder",
-		metric.ValueRecorderKind,
+		metric.ValueRecorderInstrumentKind,
 		metric.Int64NumberKind,
 		nil,
 		nil,
@@ -286,7 +286,7 @@ func TestValuerecorderMetricGroupingExport(t *testing.T) {
 func TestCountInt64MetricGroupingExport(t *testing.T) {
 	r := record{
 		"int64-count",
-		metric.CounterKind,
+		metric.CounterInstrumentKind,
 		metric.Int64NumberKind,
 		nil,
 		nil,
@@ -335,7 +335,7 @@ func TestCountInt64MetricGroupingExport(t *testing.T) {
 func TestCountFloat64MetricGroupingExport(t *testing.T) {
 	r := record{
 		"float64-count",
-		metric.CounterKind,
+		metric.CounterInstrumentKind,
 		metric.Float64NumberKind,
 		nil,
 		nil,
@@ -405,7 +405,7 @@ func TestResourceMetricGroupingExport(t *testing.T) {
 		[]record{
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				nil,
@@ -413,7 +413,7 @@ func TestResourceMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				nil,
@@ -421,7 +421,7 @@ func TestResourceMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				nil,
@@ -429,7 +429,7 @@ func TestResourceMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstB,
 				nil,
@@ -522,7 +522,7 @@ func TestResourceInstLibMetricGroupingExport(t *testing.T) {
 		[]record{
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				countingLib1,
@@ -530,7 +530,7 @@ func TestResourceInstLibMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				countingLib2,
@@ -538,7 +538,7 @@ func TestResourceInstLibMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				countingLib1,
@@ -546,7 +546,7 @@ func TestResourceInstLibMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				countingLib1,
@@ -554,7 +554,7 @@ func TestResourceInstLibMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstA,
 				summingLib,
@@ -562,7 +562,7 @@ func TestResourceInstLibMetricGroupingExport(t *testing.T) {
 			},
 			{
 				"int64-count",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				metric.Int64NumberKind,
 				testInstB,
 				countingLib1,
@@ -713,12 +713,12 @@ func runMetricExportTest(t *testing.T, exp *Exporter, rs []record, expected []me
 	recs := map[label.Distinct][]metricsdk.Record{}
 	resources := map[label.Distinct]*resource.Resource{}
 	for _, r := range rs {
-		desc := metric.NewDescriptor(r.name, r.mKind, r.nKind, r.opts...)
+		desc := metric.NewDescriptor(r.name, r.iKind, r.nKind, r.opts...)
 		labs := label.NewSet(r.labels...)
 
 		var agg, ckpt metricsdk.Aggregator
-		switch r.mKind {
-		case metric.CounterKind:
+		switch r.iKind {
+		case metric.CounterInstrumentKind:
 			agg, ckpt = metrictest.Unslice2(sum.New(2))
 		default:
 			agg, ckpt = metrictest.Unslice2(histogram.New(2, &desc, testHistogramBoundaries))

exporters/stdout/metric_test.go

@@ -99,7 +99,7 @@ func TestStdoutTimestamp(t *testing.T) {
 	checkpointSet := metrictest.NewCheckpointSet(testResource)
 
 	ctx := context.Background()
-	desc := metric.NewDescriptor("test.name", metric.ValueObserverKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.ValueObserverInstrumentKind, metric.Int64NumberKind)
 
 	lvagg, ckpt := metrictest.Unslice2(lastvalue.New(2))
 
@@ -138,7 +138,7 @@ func TestStdoutCounterFormat(t *testing.T) {
 
 	checkpointSet := metrictest.NewCheckpointSet(testResource)
 
-	desc := metric.NewDescriptor("test.name", metric.CounterKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.CounterInstrumentKind, metric.Int64NumberKind)
 
 	cagg, ckpt := metrictest.Unslice2(sum.New(2))
 
@@ -157,7 +157,7 @@ func TestStdoutLastValueFormat(t *testing.T) {
 
 	checkpointSet := metrictest.NewCheckpointSet(testResource)
 
-	desc := metric.NewDescriptor("test.name", metric.ValueObserverKind, metric.Float64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.ValueObserverInstrumentKind, metric.Float64NumberKind)
 	lvagg, ckpt := metrictest.Unslice2(lastvalue.New(2))
 
 	aggregatortest.CheckedUpdate(fix.t, lvagg, metric.NewFloat64Number(123.456), &desc)
@@ -175,7 +175,7 @@ func TestStdoutMinMaxSumCount(t *testing.T) {
 
 	checkpointSet := metrictest.NewCheckpointSet(testResource)
 
-	desc := metric.NewDescriptor("test.name", metric.ValueRecorderKind, metric.Float64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.ValueRecorderInstrumentKind, metric.Float64NumberKind)
 
 	magg, ckpt := metrictest.Unslice2(minmaxsumcount.New(2, &desc))
 
@@ -195,7 +195,7 @@ func TestStdoutValueRecorderFormat(t *testing.T) {
 
 	checkpointSet := metrictest.NewCheckpointSet(testResource)
 
-	desc := metric.NewDescriptor("test.name", metric.ValueRecorderKind, metric.Float64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.ValueRecorderInstrumentKind, metric.Float64NumberKind)
 	aagg, ckpt := metrictest.Unslice2(array.New(2))
 
 	for i := 0; i < 1000; i++ {
@@ -234,7 +234,7 @@ func TestStdoutValueRecorderFormat(t *testing.T) {
 }
 
 func TestStdoutNoData(t *testing.T) {
-	desc := metric.NewDescriptor("test.name", metric.ValueRecorderKind, metric.Float64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.ValueRecorderInstrumentKind, metric.Float64NumberKind)
 
 	runTwoAggs := func(agg, ckpt export.Aggregator) {
 		t.Run(fmt.Sprintf("%T", agg), func(t *testing.T) {
@@ -263,7 +263,7 @@ func TestStdoutLastValueNotSet(t *testing.T) {
 
 	checkpointSet := metrictest.NewCheckpointSet(testResource)
 
-	desc := metric.NewDescriptor("test.name", metric.ValueObserverKind, metric.Float64NumberKind)
+	desc := metric.NewDescriptor("test.name", metric.ValueObserverInstrumentKind, metric.Float64NumberKind)
 
 	lvagg, ckpt := metrictest.Unslice2(lastvalue.New(2))
 	require.NoError(t, lvagg.SynchronizedMove(ckpt, &desc))
@@ -314,7 +314,7 @@ func TestStdoutResource(t *testing.T) {
 
 		checkpointSet := metrictest.NewCheckpointSet(tc.res)
 
-		desc := metric.NewDescriptor("test.name", metric.ValueObserverKind, metric.Float64NumberKind)
+		desc := metric.NewDescriptor("test.name", metric.ValueObserverInstrumentKind, metric.Float64NumberKind)
 		lvagg, ckpt := metrictest.Unslice2(lastvalue.New(2))
 
 		aggregatortest.CheckedUpdate(fix.t, lvagg, metric.NewFloat64Number(123.456), &desc)

sdk/export/metric/exportkind_test.go

@@ -37,16 +37,16 @@ func TestExportKindIncludes(t *testing.T) {
 	require.False(t, DeltaExporter.Includes(PassThroughExporter|CumulativeExporter))
 }
 
-var deltaMemoryKinds = []metric.Kind{
-	metric.SumObserverKind,
-	metric.UpDownSumObserverKind,
+var deltaMemoryKinds = []metric.InstrumentKind{
+	metric.SumObserverInstrumentKind,
+	metric.UpDownSumObserverInstrumentKind,
 }
 
-var cumulativeMemoryKinds = []metric.Kind{
-	metric.ValueRecorderKind,
-	metric.ValueObserverKind,
-	metric.CounterKind,
-	metric.UpDownCounterKind,
+var cumulativeMemoryKinds = []metric.InstrumentKind{
+	metric.ValueRecorderInstrumentKind,
+	metric.ValueObserverInstrumentKind,
+	metric.CounterInstrumentKind,
+	metric.UpDownCounterInstrumentKind,
 }
 
 func TestExportKindMemoryRequired(t *testing.T) {

sdk/export/metric/metric.go

@@ -385,14 +385,14 @@ func (kind ExportKind) ExportKindFor(_ *metric.Descriptor, _ aggregation.Kind) E
 
 // MemoryRequired returns whether an exporter of this kind requires
 // memory to export correctly.
-func (kind ExportKind) MemoryRequired(mkind metric.Kind) bool {
+func (kind ExportKind) MemoryRequired(mkind metric.InstrumentKind) bool {
 	switch mkind {
-	case metric.ValueRecorderKind, metric.ValueObserverKind,
-		metric.CounterKind, metric.UpDownCounterKind:
+	case metric.ValueRecorderInstrumentKind, metric.ValueObserverInstrumentKind,
+		metric.CounterInstrumentKind, metric.UpDownCounterInstrumentKind:
 		// Delta-oriented instruments:
 		return kind.Includes(CumulativeExporter)
 
-	case metric.SumObserverKind, metric.UpDownSumObserverKind:
+	case metric.SumObserverInstrumentKind, metric.UpDownSumObserverInstrumentKind:
 		// Cumulative-oriented instruments:
 		return kind.Includes(DeltaExporter)
 	}

sdk/metric/aggregator/aggregator.go

@@ -41,8 +41,8 @@ func RangeTest(number metric.Number, descriptor *metric.Descriptor) error {
 		return aggregation.ErrNaNInput
 	}
 
-	switch descriptor.MetricKind() {
-	case metric.CounterKind, metric.SumObserverKind:
+	switch descriptor.InstrumentKind() {
+	case metric.CounterInstrumentKind, metric.SumObserverInstrumentKind:
 		if number.IsNegative(numberKind) {
 			return aggregation.ErrNegativeInput
 		}

sdk/metric/aggregator/aggregator_test.go

@@ -74,7 +74,7 @@ func TestRangeTest(t *testing.T) {
 		t.Run(nkind.String(), func(t *testing.T) {
 			desc := metric.NewDescriptor(
 				"name",
-				metric.CounterKind,
+				metric.CounterInstrumentKind,
 				nkind,
 			)
 			testRangeNegative(t, &desc)
@@ -85,10 +85,10 @@ func TestRangeTest(t *testing.T) {
 func TestNaNTest(t *testing.T) {
 	for _, nkind := range []metric.NumberKind{metric.Float64NumberKind, metric.Int64NumberKind} {
 		t.Run(nkind.String(), func(t *testing.T) {
-			for _, mkind := range []metric.Kind{
-				metric.CounterKind,
-				metric.ValueRecorderKind,
-				metric.ValueObserverKind,
+			for _, mkind := range []metric.InstrumentKind{
+				metric.CounterInstrumentKind,
+				metric.ValueRecorderInstrumentKind,
+				metric.ValueObserverInstrumentKind,
 			} {
 				desc := metric.NewDescriptor(
 					"name",

sdk/metric/aggregator/aggregatortest/test.go

@@ -53,7 +53,7 @@ func newProfiles() []Profile {
 	}
 }
 
-func NewAggregatorTest(mkind metric.Kind, nkind metric.NumberKind) *metric.Descriptor {
+func NewAggregatorTest(mkind metric.InstrumentKind, nkind metric.NumberKind) *metric.Descriptor {
 	desc := metric.NewDescriptor("test.name", mkind, nkind)
 	return &desc
 }

sdk/metric/aggregator/array/array_test.go

@@ -62,7 +62,7 @@ func new4() (_, _, _, _ *Aggregator) {
 }
 
 func (ut *updateTest) run(t *testing.T, profile aggregatortest.Profile) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 	agg, ckpt := new2()
 
 	all := aggregatortest.NewNumbers(profile.NumberKind)
@@ -129,7 +129,7 @@ type mergeTest struct {
 }
 
 func (mt *mergeTest) run(t *testing.T, profile aggregatortest.Profile) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 	agg1, agg2, ckpt1, ckpt2 := new4()
 
 	all := aggregatortest.NewNumbers(profile.NumberKind)
@@ -225,7 +225,7 @@ func TestArrayErrors(t *testing.T) {
 		require.Error(t, err)
 		require.Equal(t, err, aggregation.ErrNoData)
 
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		aggregatortest.CheckedUpdate(t, agg, metric.Number(0), descriptor)
 
@@ -253,7 +253,7 @@ func TestArrayErrors(t *testing.T) {
 }
 
 func TestArrayFloat64(t *testing.T) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, metric.Float64NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, metric.Float64NumberKind)
 
 	fpsf := func(sign int) []float64 {
 		// Check behavior of a bunch of odd floating

sdk/metric/aggregator/ddsketch/ddsketch_test.go

@@ -66,7 +66,7 @@ func checkZero(t *testing.T, agg *Aggregator, desc *metric.Descriptor) {
 }
 
 func (ut *updateTest) run(t *testing.T, profile aggregatortest.Profile) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 	agg, ckpt := new2(descriptor)
 
 	all := aggregatortest.NewNumbers(profile.NumberKind)
@@ -127,7 +127,7 @@ type mergeTest struct {
 }
 
 func (mt *mergeTest) run(t *testing.T, profile aggregatortest.Profile) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 	agg1, agg2, ckpt1, ckpt2 := new4(descriptor)
 

sdk/metric/aggregator/histogram/benchmark_test.go

@@ -37,7 +37,7 @@ func benchmarkHistogramSearchFloat64(b *testing.B, size int) {
 	for i := range values {
 		values[i] = rand.Float64() * inputRange
 	}
-	desc := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, metric.Float64NumberKind)
+	desc := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, metric.Float64NumberKind)
 	agg := &histogram.New(1, desc, boundaries)[0]
 	ctx := context.Background()
 
@@ -88,7 +88,7 @@ func benchmarkHistogramSearchInt64(b *testing.B, size int) {
 	for i := range values {
 		values[i] = int64(rand.Float64() * inputRange)
 	}
-	desc := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, metric.Int64NumberKind)
+	desc := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
 	agg := &histogram.New(1, desc, boundaries)[0]
 	ctx := context.Background()
 

sdk/metric/aggregator/histogram/histogram_test.go

@@ -109,7 +109,7 @@ func TestHistogramPositiveAndNegative(t *testing.T) {
 
 // Validates count, sum and buckets for a given profile and policy
 func testHistogram(t *testing.T, profile aggregatortest.Profile, policy policy) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 	agg, ckpt := new2(descriptor)
 
@@ -154,7 +154,7 @@ func testHistogram(t *testing.T, profile aggregatortest.Profile, policy policy)
 
 func TestHistogramInitial(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		agg := &histogram.New(1, descriptor, boundaries)[0]
 		buckets, err := agg.Histogram()
@@ -167,7 +167,7 @@ func TestHistogramInitial(t *testing.T) {
 
 func TestHistogramMerge(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		agg1, agg2, ckpt1, ckpt2 := new4(descriptor)
 
@@ -219,7 +219,7 @@ func TestHistogramMerge(t *testing.T) {
 
 func TestHistogramNotSet(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		agg, ckpt := new2(descriptor)
 

sdk/metric/aggregator/lastvalue/lastvalue_test.go

@@ -71,7 +71,7 @@ func TestLastValueUpdate(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
 		agg, ckpt := new2()
 
-		record := aggregatortest.NewAggregatorTest(metric.ValueObserverKind, profile.NumberKind)
+		record := aggregatortest.NewAggregatorTest(metric.ValueObserverInstrumentKind, profile.NumberKind)
 
 		var last metric.Number
 		for i := 0; i < count; i++ {
@@ -93,7 +93,7 @@ func TestLastValueMerge(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
 		agg1, agg2, ckpt1, ckpt2 := new4()
 
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueObserverKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueObserverInstrumentKind, profile.NumberKind)
 
 		first1 := profile.Random(+1)
 		first2 := profile.Random(+1)
@@ -124,7 +124,7 @@ func TestLastValueMerge(t *testing.T) {
 }
 
 func TestLastValueNotSet(t *testing.T) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueObserverKind, metric.Int64NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueObserverInstrumentKind, metric.Int64NumberKind)
 
 	g, ckpt := new2()
 	require.NoError(t, g.SynchronizedMove(ckpt, descriptor))

sdk/metric/aggregator/minmaxsumcount/mmsc_test.go

@@ -108,7 +108,7 @@ func checkZero(t *testing.T, agg *Aggregator, desc *metric.Descriptor) {
 
 // Validates min, max, sum and count for a given profile and policy
 func minMaxSumCount(t *testing.T, profile aggregatortest.Profile, policy policy) {
-	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+	descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 	agg, ckpt := new2(descriptor)
 
@@ -156,7 +156,7 @@ func minMaxSumCount(t *testing.T, profile aggregatortest.Profile, policy policy)
 
 func TestMinMaxSumCountMerge(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		agg1, agg2, ckpt1, ckpt2 := new4(descriptor)
 
@@ -214,7 +214,7 @@ func TestMinMaxSumCountMerge(t *testing.T) {
 
 func TestMaxSumCountNotSet(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		alloc := New(2, descriptor)
 		agg, ckpt := &alloc[0], &alloc[1]

sdk/metric/aggregator/sum/sum_test.go

@@ -65,7 +65,7 @@ func TestCounterSum(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
 		agg, ckpt := new2()
 
-		descriptor := aggregatortest.NewAggregatorTest(metric.CounterKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.CounterInstrumentKind, profile.NumberKind)
 
 		sum := metric.Number(0)
 		for i := 0; i < count; i++ {
@@ -89,7 +89,7 @@ func TestValueRecorderSum(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
 		agg, ckpt := new2()
 
-		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.ValueRecorderInstrumentKind, profile.NumberKind)
 
 		sum := metric.Number(0)
 
@@ -115,7 +115,7 @@ func TestCounterMerge(t *testing.T) {
 	aggregatortest.RunProfiles(t, func(t *testing.T, profile aggregatortest.Profile) {
 		agg1, agg2, ckpt1, ckpt2 := new4()
 
-		descriptor := aggregatortest.NewAggregatorTest(metric.CounterKind, profile.NumberKind)
+		descriptor := aggregatortest.NewAggregatorTest(metric.CounterInstrumentKind, profile.NumberKind)
 
 		sum := metric.Number(0)
 		for i := 0; i < count; i++ {

sdk/metric/histogram_stress_test.go

@@ -27,7 +27,7 @@ import (
 )
 
 func TestStressInt64Histogram(t *testing.T) {
-	desc := metric.NewDescriptor("some_metric", metric.ValueRecorderKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("some_metric", metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
 
 	alloc := histogram.New(2, &desc, []float64{25, 50, 75})
 	h, ckpt := &alloc[0], &alloc[1]

sdk/metric/minmaxsumcount_stress_test.go

@@ -25,7 +25,7 @@ import (
 )
 
 func TestStressInt64MinMaxSumCount(t *testing.T) {
-	desc := metric.NewDescriptor("some_metric", metric.ValueRecorderKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("some_metric", metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
 	alloc := minmaxsumcount.New(2, &desc)
 	mmsc, ckpt := &alloc[0], &alloc[1]
 

sdk/metric/processor/basic/basic.go

@@ -160,7 +160,7 @@ func (b *Processor) Process(accum export.Accumulation) error {
 	// Check if there is an existing value.
 	value, ok := b.state.values[key]
 	if !ok {
-		stateful := b.ExportKindFor(desc, agg.Aggregation().Kind()).MemoryRequired(desc.MetricKind())
+		stateful := b.ExportKindFor(desc, agg.Aggregation().Kind()).MemoryRequired(desc.InstrumentKind())
 
 		newValue := &stateValue{
 			labels:   accum.Labels(),
@@ -170,7 +170,7 @@ func (b *Processor) Process(accum export.Accumulation) error {
 			current:  agg,
 		}
 		if stateful {
-			if desc.MetricKind().PrecomputedSum() {
+			if desc.InstrumentKind().PrecomputedSum() {
 				// If we know we need to compute deltas, allocate two aggregators.
 				b.AggregatorFor(desc, &newValue.cumulative, &newValue.delta)
 			} else {
@@ -207,7 +207,7 @@ func (b *Processor) Process(accum export.Accumulation) error {
 	// instrument reports a PrecomputedSum to a DeltaExporter or
 	// the reverse, a non-PrecomputedSum instrument with a
 	// CumulativeExporter.  This logic is encapsulated in
-	// ExportKind.MemoryRequired(MetricKind).
+	// ExportKind.MemoryRequired(InstrumentKind).
 	//
 	// Case (b) occurs when the variable `sameCollection` is true,
 	// indicating that the stateKey for Accumulation has already
@@ -272,7 +272,7 @@ func (b *Processor) FinishCollection() error {
 	defer func() { b.finishedCollection++ }()
 
 	for key, value := range b.values {
-		mkind := key.descriptor.MetricKind()
+		mkind := key.descriptor.InstrumentKind()
 		stale := value.updated != b.finishedCollection
 		stateless := !value.stateful
 
@@ -325,7 +325,7 @@ func (b *state) ForEach(exporter export.ExportKindSelector, f func(export.Record
 		return ErrInconsistentState
 	}
 	for key, value := range b.values {
-		mkind := key.descriptor.MetricKind()
+		mkind := key.descriptor.InstrumentKind()
 
 		var agg aggregation.Aggregation
 		var start time.Time

sdk/metric/processor/basic/basic_test.go

@@ -40,7 +40,7 @@ func TestProcessor(t *testing.T) {
 		kind export.ExportKind
 	}
 	type instrumentCase struct {
-		kind metric.Kind
+		kind metric.InstrumentKind
 	}
 	type numberCase struct {
 		kind metric.NumberKind
@@ -56,12 +56,12 @@ func TestProcessor(t *testing.T) {
 	} {
 		t.Run(tc.kind.String(), func(t *testing.T) {
 			for _, ic := range []instrumentCase{
-				{kind: metric.CounterKind},
-				{kind: metric.UpDownCounterKind},
-				{kind: metric.ValueRecorderKind},
-				{kind: metric.SumObserverKind},
-				{kind: metric.UpDownSumObserverKind},
-				{kind: metric.ValueObserverKind},
+				{kind: metric.CounterInstrumentKind},
+				{kind: metric.UpDownCounterInstrumentKind},
+				{kind: metric.ValueRecorderInstrumentKind},
+				{kind: metric.SumObserverInstrumentKind},
+				{kind: metric.UpDownSumObserverInstrumentKind},
+				{kind: metric.ValueObserverInstrumentKind},
 			} {
 				t.Run(ic.kind.String(), func(t *testing.T) {
 					for _, nc := range []numberCase{
@@ -114,7 +114,7 @@ func updateFor(t *testing.T, desc *metric.Descriptor, selector export.Aggregator
 func testProcessor(
 	t *testing.T,
 	ekind export.ExportKind,
-	mkind metric.Kind,
+	mkind metric.InstrumentKind,
 	nkind metric.NumberKind,
 	akind aggregation.Kind,
 ) {
@@ -295,7 +295,7 @@ func TestBasicInconsistent(t *testing.T) {
 	// Test no start
 	b = basic.New(processorTest.AggregatorSelector(), export.PassThroughExporter)
 
-	desc := metric.NewDescriptor("inst", metric.CounterKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("inst", metric.CounterInstrumentKind, metric.Int64NumberKind)
 	accum := export.NewAccumulation(&desc, label.EmptySet(), resource.Empty(), metrictest.NoopAggregator{})
 	require.Equal(t, basic.ErrInconsistentState, b.Process(accum))
 
@@ -318,7 +318,7 @@ func TestBasicTimestamps(t *testing.T) {
 	b := basic.New(processorTest.AggregatorSelector(), export.PassThroughExporter)
 	afterNew := time.Now()
 
-	desc := metric.NewDescriptor("inst", metric.CounterKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("inst", metric.CounterInstrumentKind, metric.Int64NumberKind)
 	accum := export.NewAccumulation(&desc, label.EmptySet(), resource.Empty(), metrictest.NoopAggregator{})
 
 	b.StartCollection()
@@ -364,7 +364,7 @@ func TestStatefulNoMemoryCumulative(t *testing.T) {
 	res := resource.New(label.String("R", "V"))
 	ekind := export.CumulativeExporter
 
-	desc := metric.NewDescriptor("inst.sum", metric.CounterKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("inst.sum", metric.CounterInstrumentKind, metric.Int64NumberKind)
 	selector := processorTest.AggregatorSelector()
 
 	processor := basic.New(selector, ekind, basic.WithMemory(false))
@@ -398,7 +398,7 @@ func TestStatefulNoMemoryDelta(t *testing.T) {
 	res := resource.New(label.String("R", "V"))
 	ekind := export.DeltaExporter
 
-	desc := metric.NewDescriptor("inst.sum", metric.SumObserverKind, metric.Int64NumberKind)
+	desc := metric.NewDescriptor("inst.sum", metric.SumObserverInstrumentKind, metric.Int64NumberKind)
 	selector := processorTest.AggregatorSelector()
 
 	processor := basic.New(selector, ekind, basic.WithMemory(false))
@@ -436,7 +436,7 @@ func TestMultiObserverSum(t *testing.T) {
 	} {
 
 		res := resource.New(label.String("R", "V"))
-		desc := metric.NewDescriptor("observe.sum", metric.SumObserverKind, metric.Int64NumberKind)
+		desc := metric.NewDescriptor("observe.sum", metric.SumObserverInstrumentKind, metric.Int64NumberKind)
 		selector := processorTest.AggregatorSelector()
 
 		processor := basic.New(selector, ekind, basic.WithMemory(false))

sdk/metric/selector/simple/simple.go

@@ -95,10 +95,10 @@ func lastValueAggs(aggPtrs []*export.Aggregator) {
 }
 
 func (selectorInexpensive) AggregatorFor(descriptor *metric.Descriptor, aggPtrs ...*export.Aggregator) {
-	switch descriptor.MetricKind() {
-	case metric.ValueObserverKind:
+	switch descriptor.InstrumentKind() {
+	case metric.ValueObserverInstrumentKind:
 		lastValueAggs(aggPtrs)
-	case metric.ValueRecorderKind:
+	case metric.ValueRecorderInstrumentKind:
 		aggs := minmaxsumcount.New(len(aggPtrs), descriptor)
 		for i := range aggPtrs {
 			*aggPtrs[i] = &aggs[i]
@@ -109,10 +109,10 @@ func (selectorInexpensive) AggregatorFor(descriptor *metric.Descriptor, aggPtrs
 }
 
 func (s selectorSketch) AggregatorFor(descriptor *metric.Descriptor, aggPtrs ...*export.Aggregator) {
-	switch descriptor.MetricKind() {
-	case metric.ValueObserverKind:
+	switch descriptor.InstrumentKind() {
+	case metric.ValueObserverInstrumentKind:
 		lastValueAggs(aggPtrs)
-	case metric.ValueRecorderKind:
+	case metric.ValueRecorderInstrumentKind:
 		aggs := ddsketch.New(len(aggPtrs), descriptor, s.config)
 		for i := range aggPtrs {
 			*aggPtrs[i] = &aggs[i]
@@ -123,10 +123,10 @@ func (s selectorSketch) AggregatorFor(descriptor *metric.Descriptor, aggPtrs ...
 }
 
 func (selectorExact) AggregatorFor(descriptor *metric.Descriptor, aggPtrs ...*export.Aggregator) {
-	switch descriptor.MetricKind() {
-	case metric.ValueObserverKind:
+	switch descriptor.InstrumentKind() {
+	case metric.ValueObserverInstrumentKind:
 		lastValueAggs(aggPtrs)
-	case metric.ValueRecorderKind:
+	case metric.ValueRecorderInstrumentKind:
 		aggs := array.New(len(aggPtrs))
 		for i := range aggPtrs {
 			*aggPtrs[i] = &aggs[i]
@@ -137,10 +137,10 @@ func (selectorExact) AggregatorFor(descriptor *metric.Descriptor, aggPtrs ...*ex
 }
 
 func (s selectorHistogram) AggregatorFor(descriptor *metric.Descriptor, aggPtrs ...*export.Aggregator) {
-	switch descriptor.MetricKind() {
-	case metric.ValueObserverKind:
+	switch descriptor.InstrumentKind() {
+	case metric.ValueObserverInstrumentKind:
 		lastValueAggs(aggPtrs)
-	case metric.ValueRecorderKind:
+	case metric.ValueRecorderInstrumentKind:
 		aggs := histogram.New(len(aggPtrs), descriptor, s.boundaries)
 		for i := range aggPtrs {
 			*aggPtrs[i] = &aggs[i]

sdk/metric/selector/simple/simple_test.go

@@ -31,12 +31,12 @@ import (
 )
 
 var (
-	testCounterDesc           = metric.NewDescriptor("counter", metric.CounterKind, metric.Int64NumberKind)
-	testUpDownCounterDesc     = metric.NewDescriptor("updowncounter", metric.UpDownCounterKind, metric.Int64NumberKind)
-	testSumObserverDesc       = metric.NewDescriptor("sumobserver", metric.SumObserverKind, metric.Int64NumberKind)
-	testUpDownSumObserverDesc = metric.NewDescriptor("updownsumobserver", metric.UpDownSumObserverKind, metric.Int64NumberKind)
-	testValueRecorderDesc     = metric.NewDescriptor("valuerecorder", metric.ValueRecorderKind, metric.Int64NumberKind)
-	testValueObserverDesc     = metric.NewDescriptor("valueobserver", metric.ValueObserverKind, metric.Int64NumberKind)
+	testCounterDesc           = metric.NewDescriptor("counter", metric.CounterInstrumentKind, metric.Int64NumberKind)
+	testUpDownCounterDesc     = metric.NewDescriptor("updowncounter", metric.UpDownCounterInstrumentKind, metric.Int64NumberKind)
+	testSumObserverDesc       = metric.NewDescriptor("sumobserver", metric.SumObserverInstrumentKind, metric.Int64NumberKind)
+	testUpDownSumObserverDesc = metric.NewDescriptor("updownsumobserver", metric.UpDownSumObserverInstrumentKind, metric.Int64NumberKind)
+	testValueRecorderDesc     = metric.NewDescriptor("valuerecorder", metric.ValueRecorderInstrumentKind, metric.Int64NumberKind)
+	testValueObserverDesc     = metric.NewDescriptor("valueobserver", metric.ValueObserverInstrumentKind, metric.Int64NumberKind)
 )
 
 func oneAgg(sel export.AggregatorSelector, desc *metric.Descriptor) export.Aggregator {

sdk/metric/stress_test.go

@@ -264,14 +264,14 @@ func (f *testFixture) Process(accumulation export.Accumulation) error {
 	actual, _ := f.received.LoadOrStore(key, f.impl.newStore())
 
 	agg := accumulation.Aggregator()
-	switch accumulation.Descriptor().MetricKind() {
-	case metric.CounterKind:
+	switch accumulation.Descriptor().InstrumentKind() {
+	case metric.CounterInstrumentKind:
 		sum, err := agg.(aggregation.Sum).Sum()
 		if err != nil {
 			f.T.Fatal("Sum error: ", err)
 		}
 		f.impl.storeCollect(actual, sum, time.Time{})
-	case metric.ValueRecorderKind:
+	case metric.ValueRecorderInstrumentKind:
 		lv, ts, err := agg.(aggregation.LastValue).LastValue()
 		if err != nil && err != aggregation.ErrNoData {
 			f.T.Fatal("Last value error: ", err)