instrumentation/runtime: observable instrument not registered for callback

[utezduyar]

Component(s)

No response

What happened?

Following runnable code with conditional view is not working and it prints observable instrument not registered for callback message.

package main

import (
	"encoding/json"
	"log"
	"math/rand"
	"os"
	"time"

	"go.opentelemetry.io/contrib/instrumentation/runtime"
	"go.opentelemetry.io/otel/exporters/stdout/stdoutmetric"
	"go.opentelemetry.io/otel/sdk/metric"
	metricsdk "go.opentelemetry.io/otel/sdk/metric"

	"go.opentelemetry.io/otel"
)

func main() {

	// Print with a JSON encoder that indents with two spaces.
	enc := json.NewEncoder(os.Stdout)
	enc.SetIndent("", "  ")
	exporter, err := stdoutmetric.New(
		stdoutmetric.WithEncoder(enc),
		stdoutmetric.WithoutTimestamps(),
	)
	if err != nil {
		panic(err)
	}

	reader := metricsdk.NewPeriodicReader(exporter,
		metricsdk.WithInterval(5*time.Second))

	var drop metric.View = func(i metric.Instrument) (metric.Stream, bool) {
		if i.Name != "process.runtime.go.mem.heap_alloc" {
			return metricsdk.Stream{Aggregation: metricsdk.AggregationDrop{}}, true
		}
		return metricsdk.Stream{}, false
	}

	meterProvider := metricsdk.NewMeterProvider(
		metricsdk.WithReader(reader),
		metricsdk.WithView(drop),
	)
	otel.SetMeterProvider(meterProvider)

	log.Print("Starting runtime instrumentation:")
	err = runtime.Start(runtime.WithMinimumReadMemStatsInterval(time.Second))
	if err != nil {
		panic(err)
	}

	time.Sleep(99 * time.Minute)

}

If I remove the condition from the view and drop the aggregation, it works.

	var drop metric.View = func(i metric.Instrument) (metric.Stream, bool) {
		return metricsdk.Stream{Aggregation: metricsdk.AggregationDrop{}}, true
	}

I opened the same ticket on opentelemetry-go (open-telemetry/opentelemetry-go#4666) some days ago but now I wonder if this is a problem specific to the instrumentation/runtime package. Same way of dropping metrics with a custom View works for other scope like: go.opentelemetry.io/contrib/instrumentation/net/http/otelhttp

Collector version

v0.45.0

Environment information

No response

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

No response

[mx-psi]

Sounds like you were meaning to post this on https://github.com/open-telemetry/opentelemetry-go-contrib

@Aneurysm9 maybe you have permissions to move this issue around to the right repository?

[utezduyar]

Ah! Yes you're right. I don't have permission. Hope someone can help.

[utezduyar]

Wrong repository. Created a new one open-telemetry/opentelemetry-go-contrib#4487