rebase: update kubernetes to 1.26.1

update kubernetes and its dependencies
to v1.26.1

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

vendor/go.opentelemetry.io/otel/metric/internal/global/instruments.go

@@ -0,0 +1,360 @@
+// 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 global // import "go.opentelemetry.io/otel/metric/internal/global"
+
+import (
+	"context"
+	"sync/atomic"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/attribute"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
+	"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/asyncint64"
+	"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/syncint64"
+)
+
+type afCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //asyncfloat64.Counter
+
+	instrument.Asynchronous
+}
+
+func (i *afCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.AsyncFloat64().Counter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *afCounter) Observe(ctx context.Context, x float64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(asyncfloat64.Counter).Observe(ctx, x, attrs...)
+	}
+}
+
+func (i *afCounter) unwrap() instrument.Asynchronous {
+	if ctr := i.delegate.Load(); ctr != nil {
+		return ctr.(asyncfloat64.Counter)
+	}
+	return nil
+}
+
+type afUpDownCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //asyncfloat64.UpDownCounter
+
+	instrument.Asynchronous
+}
+
+func (i *afUpDownCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.AsyncFloat64().UpDownCounter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *afUpDownCounter) Observe(ctx context.Context, x float64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(asyncfloat64.UpDownCounter).Observe(ctx, x, attrs...)
+	}
+}
+
+func (i *afUpDownCounter) unwrap() instrument.Asynchronous {
+	if ctr := i.delegate.Load(); ctr != nil {
+		return ctr.(asyncfloat64.UpDownCounter)
+	}
+	return nil
+}
+
+type afGauge struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //asyncfloat64.Gauge
+
+	instrument.Asynchronous
+}
+
+func (i *afGauge) setDelegate(m metric.Meter) {
+	ctr, err := m.AsyncFloat64().Gauge(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *afGauge) Observe(ctx context.Context, x float64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(asyncfloat64.Gauge).Observe(ctx, x, attrs...)
+	}
+}
+
+func (i *afGauge) unwrap() instrument.Asynchronous {
+	if ctr := i.delegate.Load(); ctr != nil {
+		return ctr.(asyncfloat64.Gauge)
+	}
+	return nil
+}
+
+type aiCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //asyncint64.Counter
+
+	instrument.Asynchronous
+}
+
+func (i *aiCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.AsyncInt64().Counter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *aiCounter) Observe(ctx context.Context, x int64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(asyncint64.Counter).Observe(ctx, x, attrs...)
+	}
+}
+
+func (i *aiCounter) unwrap() instrument.Asynchronous {
+	if ctr := i.delegate.Load(); ctr != nil {
+		return ctr.(asyncint64.Counter)
+	}
+	return nil
+}
+
+type aiUpDownCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //asyncint64.UpDownCounter
+
+	instrument.Asynchronous
+}
+
+func (i *aiUpDownCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.AsyncInt64().UpDownCounter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *aiUpDownCounter) Observe(ctx context.Context, x int64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(asyncint64.UpDownCounter).Observe(ctx, x, attrs...)
+	}
+}
+
+func (i *aiUpDownCounter) unwrap() instrument.Asynchronous {
+	if ctr := i.delegate.Load(); ctr != nil {
+		return ctr.(asyncint64.UpDownCounter)
+	}
+	return nil
+}
+
+type aiGauge struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //asyncint64.Gauge
+
+	instrument.Asynchronous
+}
+
+func (i *aiGauge) setDelegate(m metric.Meter) {
+	ctr, err := m.AsyncInt64().Gauge(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *aiGauge) Observe(ctx context.Context, x int64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(asyncint64.Gauge).Observe(ctx, x, attrs...)
+	}
+}
+
+func (i *aiGauge) unwrap() instrument.Asynchronous {
+	if ctr := i.delegate.Load(); ctr != nil {
+		return ctr.(asyncint64.Gauge)
+	}
+	return nil
+}
+
+//Sync Instruments.
+type sfCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //syncfloat64.Counter
+
+	instrument.Synchronous
+}
+
+func (i *sfCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.SyncFloat64().Counter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *sfCounter) Add(ctx context.Context, incr float64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(syncfloat64.Counter).Add(ctx, incr, attrs...)
+	}
+}
+
+type sfUpDownCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //syncfloat64.UpDownCounter
+
+	instrument.Synchronous
+}
+
+func (i *sfUpDownCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.SyncFloat64().UpDownCounter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *sfUpDownCounter) Add(ctx context.Context, incr float64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(syncfloat64.UpDownCounter).Add(ctx, incr, attrs...)
+	}
+}
+
+type sfHistogram struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //syncfloat64.Histogram
+
+	instrument.Synchronous
+}
+
+func (i *sfHistogram) setDelegate(m metric.Meter) {
+	ctr, err := m.SyncFloat64().Histogram(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *sfHistogram) Record(ctx context.Context, x float64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(syncfloat64.Histogram).Record(ctx, x, attrs...)
+	}
+}
+
+type siCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //syncint64.Counter
+
+	instrument.Synchronous
+}
+
+func (i *siCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.SyncInt64().Counter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *siCounter) Add(ctx context.Context, x int64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(syncint64.Counter).Add(ctx, x, attrs...)
+	}
+}
+
+type siUpDownCounter struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //syncint64.UpDownCounter
+
+	instrument.Synchronous
+}
+
+func (i *siUpDownCounter) setDelegate(m metric.Meter) {
+	ctr, err := m.SyncInt64().UpDownCounter(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *siUpDownCounter) Add(ctx context.Context, x int64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(syncint64.UpDownCounter).Add(ctx, x, attrs...)
+	}
+}
+
+type siHistogram struct {
+	name string
+	opts []instrument.Option
+
+	delegate atomic.Value //syncint64.Histogram
+
+	instrument.Synchronous
+}
+
+func (i *siHistogram) setDelegate(m metric.Meter) {
+	ctr, err := m.SyncInt64().Histogram(i.name, i.opts...)
+	if err != nil {
+		otel.Handle(err)
+		return
+	}
+	i.delegate.Store(ctr)
+}
+
+func (i *siHistogram) Record(ctx context.Context, x int64, attrs ...attribute.KeyValue) {
+	if ctr := i.delegate.Load(); ctr != nil {
+		ctr.(syncint64.Histogram).Record(ctx, x, attrs...)
+	}
+}

vendor/go.opentelemetry.io/otel/metric/internal/global/meter.go

@@ -0,0 +1,347 @@
+// 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 global // import "go.opentelemetry.io/otel/metric/internal/global"
+
+import (
+	"context"
+	"sync"
+	"sync/atomic"
+
+	"go.opentelemetry.io/otel"
+	"go.opentelemetry.io/otel/metric"
+	"go.opentelemetry.io/otel/metric/instrument"
+	"go.opentelemetry.io/otel/metric/instrument/asyncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/asyncint64"
+	"go.opentelemetry.io/otel/metric/instrument/syncfloat64"
+	"go.opentelemetry.io/otel/metric/instrument/syncint64"
+)
+
+// meterProvider is a placeholder for a configured SDK MeterProvider.
+//
+// All MeterProvider functionality is forwarded to a delegate once
+// configured.
+type meterProvider struct {
+	mtx    sync.Mutex
+	meters map[il]*meter
+
+	delegate metric.MeterProvider
+}
+
+type il struct {
+	name    string
+	version string
+}
+
+// setDelegate configures p to delegate all MeterProvider functionality to
+// provider.
+//
+// All Meters provided prior to this function call are switched out to be
+// Meters provided by provider. All instruments and callbacks are recreated and
+// delegated.
+//
+// It is guaranteed by the caller that this happens only once.
+func (p *meterProvider) setDelegate(provider metric.MeterProvider) {
+	p.mtx.Lock()
+	defer p.mtx.Unlock()
+
+	p.delegate = provider
+
+	if len(p.meters) == 0 {
+		return
+	}
+
+	for _, meter := range p.meters {
+		meter.setDelegate(provider)
+	}
+
+	p.meters = nil
+}
+
+// Meter implements MeterProvider.
+func (p *meterProvider) Meter(name string, opts ...metric.MeterOption) metric.Meter {
+	p.mtx.Lock()
+	defer p.mtx.Unlock()
+
+	if p.delegate != nil {
+		return p.delegate.Meter(name, opts...)
+	}
+
+	// At this moment it is guaranteed that no sdk is installed, save the meter in the meters map.
+
+	c := metric.NewMeterConfig(opts...)
+	key := il{
+		name:    name,
+		version: c.InstrumentationVersion(),
+	}
+
+	if p.meters == nil {
+		p.meters = make(map[il]*meter)
+	}
+
+	if val, ok := p.meters[key]; ok {
+		return val
+	}
+
+	t := &meter{name: name, opts: opts}
+	p.meters[key] = t
+	return t
+}
+
+// meter is a placeholder for a metric.Meter.
+//
+// All Meter functionality is forwarded to a delegate once configured.
+// Otherwise, all functionality is forwarded to a NoopMeter.
+type meter struct {
+	name string
+	opts []metric.MeterOption
+
+	mtx         sync.Mutex
+	instruments []delegatedInstrument
+	callbacks   []delegatedCallback
+
+	delegate atomic.Value // metric.Meter
+}
+
+type delegatedInstrument interface {
+	setDelegate(metric.Meter)
+}
+
+// setDelegate configures m to delegate all Meter functionality to Meters
+// created by provider.
+//
+// All subsequent calls to the Meter methods will be passed to the delegate.
+//
+// It is guaranteed by the caller that this happens only once.
+func (m *meter) setDelegate(provider metric.MeterProvider) {
+	meter := provider.Meter(m.name, m.opts...)
+	m.delegate.Store(meter)
+
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
+
+	for _, inst := range m.instruments {
+		inst.setDelegate(meter)
+	}
+
+	for _, callback := range m.callbacks {
+		callback.setDelegate(meter)
+	}
+
+	m.instruments = nil
+	m.callbacks = nil
+}
+
+// AsyncInt64 is the namespace for the Asynchronous Integer instruments.
+//
+// To Observe data with instruments it must be registered in a callback.
+func (m *meter) AsyncInt64() asyncint64.InstrumentProvider {
+	if del, ok := m.delegate.Load().(metric.Meter); ok {
+		return del.AsyncInt64()
+	}
+	return (*aiInstProvider)(m)
+}
+
+// AsyncFloat64 is the namespace for the Asynchronous Float instruments.
+//
+// To Observe data with instruments it must be registered in a callback.
+func (m *meter) AsyncFloat64() asyncfloat64.InstrumentProvider {
+	if del, ok := m.delegate.Load().(metric.Meter); ok {
+		return del.AsyncFloat64()
+	}
+	return (*afInstProvider)(m)
+}
+
+// RegisterCallback captures the function that will be called during Collect.
+//
+// It is only valid to call Observe within the scope of the passed function,
+// and only on the instruments that were registered with this call.
+func (m *meter) RegisterCallback(insts []instrument.Asynchronous, function func(context.Context)) error {
+	if del, ok := m.delegate.Load().(metric.Meter); ok {
+		insts = unwrapInstruments(insts)
+		return del.RegisterCallback(insts, function)
+	}
+
+	m.mtx.Lock()
+	defer m.mtx.Unlock()
+	m.callbacks = append(m.callbacks, delegatedCallback{
+		instruments: insts,
+		function:    function,
+	})
+
+	return nil
+}
+
+type wrapped interface {
+	unwrap() instrument.Asynchronous
+}
+
+func unwrapInstruments(instruments []instrument.Asynchronous) []instrument.Asynchronous {
+	out := make([]instrument.Asynchronous, 0, len(instruments))
+
+	for _, inst := range instruments {
+		if in, ok := inst.(wrapped); ok {
+			out = append(out, in.unwrap())
+		} else {
+			out = append(out, inst)
+		}
+	}
+
+	return out
+}
+
+// SyncInt64 is the namespace for the Synchronous Integer instruments.
+func (m *meter) SyncInt64() syncint64.InstrumentProvider {
+	if del, ok := m.delegate.Load().(metric.Meter); ok {
+		return del.SyncInt64()
+	}
+	return (*siInstProvider)(m)
+}
+
+// SyncFloat64 is the namespace for the Synchronous Float instruments.
+func (m *meter) SyncFloat64() syncfloat64.InstrumentProvider {
+	if del, ok := m.delegate.Load().(metric.Meter); ok {
+		return del.SyncFloat64()
+	}
+	return (*sfInstProvider)(m)
+}
+
+type delegatedCallback struct {
+	instruments []instrument.Asynchronous
+	function    func(context.Context)
+}
+
+func (c *delegatedCallback) setDelegate(m metric.Meter) {
+	insts := unwrapInstruments(c.instruments)
+	err := m.RegisterCallback(insts, c.function)
+	if err != nil {
+		otel.Handle(err)
+	}
+}
+
+type afInstProvider meter
+
+// Counter creates an instrument for recording increasing values.
+func (ip *afInstProvider) Counter(name string, opts ...instrument.Option) (asyncfloat64.Counter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &afCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// UpDownCounter creates an instrument for recording changes of a value.
+func (ip *afInstProvider) UpDownCounter(name string, opts ...instrument.Option) (asyncfloat64.UpDownCounter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &afUpDownCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// Gauge creates an instrument for recording the current value.
+func (ip *afInstProvider) Gauge(name string, opts ...instrument.Option) (asyncfloat64.Gauge, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &afGauge{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+type aiInstProvider meter
+
+// Counter creates an instrument for recording increasing values.
+func (ip *aiInstProvider) Counter(name string, opts ...instrument.Option) (asyncint64.Counter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &aiCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// UpDownCounter creates an instrument for recording changes of a value.
+func (ip *aiInstProvider) UpDownCounter(name string, opts ...instrument.Option) (asyncint64.UpDownCounter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &aiUpDownCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// Gauge creates an instrument for recording the current value.
+func (ip *aiInstProvider) Gauge(name string, opts ...instrument.Option) (asyncint64.Gauge, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &aiGauge{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+type sfInstProvider meter
+
+// Counter creates an instrument for recording increasing values.
+func (ip *sfInstProvider) Counter(name string, opts ...instrument.Option) (syncfloat64.Counter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &sfCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// UpDownCounter creates an instrument for recording changes of a value.
+func (ip *sfInstProvider) UpDownCounter(name string, opts ...instrument.Option) (syncfloat64.UpDownCounter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &sfUpDownCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// Histogram creates an instrument for recording a distribution of values.
+func (ip *sfInstProvider) Histogram(name string, opts ...instrument.Option) (syncfloat64.Histogram, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &sfHistogram{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+type siInstProvider meter
+
+// Counter creates an instrument for recording increasing values.
+func (ip *siInstProvider) Counter(name string, opts ...instrument.Option) (syncint64.Counter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &siCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// UpDownCounter creates an instrument for recording changes of a value.
+func (ip *siInstProvider) UpDownCounter(name string, opts ...instrument.Option) (syncint64.UpDownCounter, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &siUpDownCounter{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}
+
+// Histogram creates an instrument for recording a distribution of values.
+func (ip *siInstProvider) Histogram(name string, opts ...instrument.Option) (syncint64.Histogram, error) {
+	ip.mtx.Lock()
+	defer ip.mtx.Unlock()
+	ctr := &siHistogram{name: name, opts: opts}
+	ip.instruments = append(ip.instruments, ctr)
+	return ctr, nil
+}

vendor/go.opentelemetry.io/otel/metric/internal/global/state.go

@@ -0,0 +1,68 @@
+// 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
+//
+//     htmp://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 global // import "go.opentelemetry.io/otel/metric/internal/global"
+
+import (
+	"errors"
+	"sync"
+	"sync/atomic"
+
+	"go.opentelemetry.io/otel/internal/global"
+	"go.opentelemetry.io/otel/metric"
+)
+
+var (
+	globalMeterProvider = defaultMeterProvider()
+
+	delegateMeterOnce sync.Once
+)
+
+type meterProviderHolder struct {
+	mp metric.MeterProvider
+}
+
+// MeterProvider is the internal implementation for global.MeterProvider.
+func MeterProvider() metric.MeterProvider {
+	return globalMeterProvider.Load().(meterProviderHolder).mp
+}
+
+// SetMeterProvider is the internal implementation for global.SetMeterProvider.
+func SetMeterProvider(mp metric.MeterProvider) {
+	current := MeterProvider()
+	if _, cOk := current.(*meterProvider); cOk {
+		if _, mpOk := mp.(*meterProvider); mpOk && current == mp {
+			// Do not assign the default delegating MeterProvider to delegate
+			// to itself.
+			global.Error(
+				errors.New("no delegate configured in meter provider"),
+				"Setting meter provider to it's current value. No delegate will be configured",
+			)
+			return
+		}
+	}
+
+	delegateMeterOnce.Do(func() {
+		if def, ok := current.(*meterProvider); ok {
+			def.setDelegate(mp)
+		}
+	})
+	globalMeterProvider.Store(meterProviderHolder{mp: mp})
+}
+
+func defaultMeterProvider() *atomic.Value {
+	v := &atomic.Value{}
+	v.Store(meterProviderHolder{mp: &meterProvider{}})
+	return v
+}