[bugfix] Downstep otel to fix freebsd compile issue (#1773)

https://github.com/open-telemetry/opentelemetry-go/issues/4076

vendor/go.opentelemetry.io/otel/metric/noop.go

@@ -0,0 +1,143 @@
+// 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.
+
+package metric // import "go.opentelemetry.io/otel/metric"
+
+import (
+	"context"
+
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric/instrument"
+)
+
+// NewNoopMeterProvider creates a MeterProvider that does not record any metrics.
+func NewNoopMeterProvider() MeterProvider {
+	return noopMeterProvider{}
+}
+
+type noopMeterProvider struct{}
+
+func (noopMeterProvider) Meter(string, ...MeterOption) Meter {
+	return noopMeter{}
+}
+
+// NewNoopMeter creates a Meter that does not record any metrics.
+func NewNoopMeter() Meter {
+	return noopMeter{}
+}
+
+type noopMeter struct{}
+
+func (noopMeter) Int64Counter(string, ...instrument.Int64Option) (instrument.Int64Counter, error) {
+	return nonrecordingSyncInt64Instrument{}, nil
+}
+
+func (noopMeter) Int64UpDownCounter(string, ...instrument.Int64Option) (instrument.Int64UpDownCounter, error) {
+	return nonrecordingSyncInt64Instrument{}, nil
+}
+
+func (noopMeter) Int64Histogram(string, ...instrument.Int64Option) (instrument.Int64Histogram, error) {
+	return nonrecordingSyncInt64Instrument{}, nil
+}
+
+func (noopMeter) Int64ObservableCounter(string, ...instrument.Int64ObserverOption) (instrument.Int64ObservableCounter, error) {
+	return nonrecordingAsyncInt64Instrument{}, nil
+}
+
+func (noopMeter) Int64ObservableUpDownCounter(string, ...instrument.Int64ObserverOption) (instrument.Int64ObservableUpDownCounter, error) {
+	return nonrecordingAsyncInt64Instrument{}, nil
+}
+
+func (noopMeter) Int64ObservableGauge(string, ...instrument.Int64ObserverOption) (instrument.Int64ObservableGauge, error) {
+	return nonrecordingAsyncInt64Instrument{}, nil
+}
+
+func (noopMeter) Float64Counter(string, ...instrument.Float64Option) (instrument.Float64Counter, error) {
+	return nonrecordingSyncFloat64Instrument{}, nil
+}
+
+func (noopMeter) Float64UpDownCounter(string, ...instrument.Float64Option) (instrument.Float64UpDownCounter, error) {
+	return nonrecordingSyncFloat64Instrument{}, nil
+}
+
+func (noopMeter) Float64Histogram(string, ...instrument.Float64Option) (instrument.Float64Histogram, error) {
+	return nonrecordingSyncFloat64Instrument{}, nil
+}
+
+func (noopMeter) Float64ObservableCounter(string, ...instrument.Float64ObserverOption) (instrument.Float64ObservableCounter, error) {
+	return nonrecordingAsyncFloat64Instrument{}, nil
+}
+
+func (noopMeter) Float64ObservableUpDownCounter(string, ...instrument.Float64ObserverOption) (instrument.Float64ObservableUpDownCounter, error) {
+	return nonrecordingAsyncFloat64Instrument{}, nil
+}
+
+func (noopMeter) Float64ObservableGauge(string, ...instrument.Float64ObserverOption) (instrument.Float64ObservableGauge, error) {
+	return nonrecordingAsyncFloat64Instrument{}, nil
+}
+
+// RegisterCallback creates a register callback that does not record any metrics.
+func (noopMeter) RegisterCallback(Callback, ...instrument.Asynchronous) (Registration, error) {
+	return noopReg{}, nil
+}
+
+type noopReg struct{}
+
+func (noopReg) Unregister() error { return nil }
+
+type nonrecordingAsyncFloat64Instrument struct {
+	instrument.Float64Observable
+}
+
+var (
+	_ instrument.Float64ObservableCounter       = nonrecordingAsyncFloat64Instrument{}
+	_ instrument.Float64ObservableUpDownCounter = nonrecordingAsyncFloat64Instrument{}
+	_ instrument.Float64ObservableGauge         = nonrecordingAsyncFloat64Instrument{}
+)
+
+type nonrecordingAsyncInt64Instrument struct {
+	instrument.Int64Observable
+}
+
+var (
+	_ instrument.Int64ObservableCounter       = nonrecordingAsyncInt64Instrument{}
+	_ instrument.Int64ObservableUpDownCounter = nonrecordingAsyncInt64Instrument{}
+	_ instrument.Int64ObservableGauge         = nonrecordingAsyncInt64Instrument{}
+)
+
+type nonrecordingSyncFloat64Instrument struct {
+	instrument.Synchronous
+}
+
+var (
+	_ instrument.Float64Counter       = nonrecordingSyncFloat64Instrument{}
+	_ instrument.Float64UpDownCounter = nonrecordingSyncFloat64Instrument{}
+	_ instrument.Float64Histogram     = nonrecordingSyncFloat64Instrument{}
+)
+
+func (nonrecordingSyncFloat64Instrument) Add(context.Context, float64, ...attribute.KeyValue)    {}
+func (nonrecordingSyncFloat64Instrument) Record(context.Context, float64, ...attribute.KeyValue) {}
+
+type nonrecordingSyncInt64Instrument struct {
+	instrument.Synchronous
+}
+
+var (
+	_ instrument.Int64Counter       = nonrecordingSyncInt64Instrument{}
+	_ instrument.Int64UpDownCounter = nonrecordingSyncInt64Instrument{}
+	_ instrument.Int64Histogram     = nonrecordingSyncInt64Instrument{}
+)
+
+func (nonrecordingSyncInt64Instrument) Add(context.Context, int64, ...attribute.KeyValue)    {}
+func (nonrecordingSyncInt64Instrument) Record(context.Context, int64, ...attribute.KeyValue) {}