`ECONNREFUSED` on Node.js example

[aduh95]

Description

The logs do not reach the NewRelic dashboard, and it complains about not being able to connect to a local port.

Steps to Reproduce

As described in the README, set the env var, change the address because I'm in the EU, run npm run start/yarn start.

cat -> download.sh <<'EOF'
#!/bin/sh

set -xe

for FILE in "$@"; do
  curl -sSLo "$FILE" "https://github.com/newrelic/newrelic-opentelemetry-examples/raw/refs/heads/main/getting-started-guides/javascript/$FILE"
done
EOF
sh download.sh package.json app.js instrumentation.js
yarn

Relevant Logs / Console output

Trying to start the Node.js example, I'm getting the following output:

Accessing resource attributes before async attributes settled
Accessing resource attributes before async attributes settled
Listening for requests on http://localhost:8080
{"stack":"AggregateError [ECONNREFUSED]: \n    at internalConnectMultiple (node:net:1139:18)\n    at afterConnectMultiple (node:net:1712:7)\n    at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17)","errors":"Error: connect ECONNREFUSED ::1:4318,Error: connect ECONNREFUSED 127.0.0.1:4318","code":"ECONNREFUSED","name":"AggregateError"}
{"stack":"AggregateError [ECONNREFUSED]: \n    at internalConnectMultiple (node:net:1139:18)\n    at afterConnectMultiple (node:net:1712:7)\n    at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17)","errors":"Error: connect ECONNREFUSED ::1:4318,Error: connect ECONNREFUSED 127.0.0.1:4318","code":"ECONNREFUSED","name":"AggregateError"}
{"stack":"AggregateError [ECONNREFUSED]: \n    at internalConnectMultiple (node:net:1139:18)\n    at afterConnectMultiple (node:net:1712:7)\n    at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17)","errors":"Error: connect ECONNREFUSED ::1:4318,Error: connect ECONNREFUSED 127.0.0.1:4318","code":"ECONNREFUSED","name":"AggregateError"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error AggregateError)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error AggregateError)","name":"Error"}
{"stack":"AggregateError [ECONNREFUSED]: \n    at internalConnectMultiple (node:net:1139:18)\n    at afterConnectMultiple (node:net:1712:7)\n    at TCPConnectWrap.callbackTrampoline (node:internal/async_hooks:130:17)","errors":"Error: connect ECONNREFUSED ::1:4318,Error: connect ECONNREFUSED 127.0.0.1:4318","code":"ECONNREFUSED","name":"AggregateError"}

Nothing appears to reach the NewRelic dashboard.

I've tried updating all the packages, and replace @opentelemetry/exporter-*-otlp-proto imports to @opentelemetry/exporter-*-otlp-grpc, which produce a different output:

Accessing resource attributes before async attributes settled
Accessing resource attributes before async attributes settled
Listening for requests on http://localhost:8080
{"stack":"Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317\n    at callErrorFromStatus (~/node_modules/@grpc/grpc-js/build/src/call.js:32:19)\n    at Object.onReceiveStatus (~/node_modules/@grpc/grpc-js/build/src/client.js:193:76)\n    at Object.onReceiveStatus (~/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:361:141)\n    at Object.onReceiveStatus (~/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:324:181)\n    at ~/node_modules/@grpc/grpc-js/build/src/resolving-call.js:135:78\n    at process.processTicksAndRejections (node:internal/process/task_queues:85:11)\nfor call at\n    at ServiceClientImpl.makeUnaryRequest (~/node_modules/@grpc/grpc-js/build/src/client.js:161:32)\n    at ServiceClientImpl.<anonymous> (~/node_modules/@grpc/grpc-js/build/src/make-client.js:105:19)\n    at ~/node_modules/@opentelemetry/instrumentation-grpc/build/src/clientUtils.js:131:31\n    at ~/node_modules/@opentelemetry/instrumentation-grpc/build/src/instrumentation.js:212:209\n    at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)\n    at AsyncLocalStorageContextManager.with (~/node_modules/@opentelemetry/context-async-hooks/build/src/AsyncLocalStorageContextManager.js:33:40)\n    at ContextAPI.with (~/node_modules/@opentelemetry/api/build/src/api/context.js:60:46)\n    at ServiceClientImpl.clientMethodTrace [as export] (~/node_modules/@opentelemetry/instrumentation-grpc/build/src/instrumentation.js:212:42)\n    at ~/node_modules/@opentelemetry/otlp-grpc-exporter-base/build/src/grpc-exporter-transport.js:100:32\n    at new Promise (<anonymous>)","message":"14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317","code":"14","details":"No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317","metadata":"[object Object]","name":"Error"}
{"stack":"Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED ::1:4317\n    at callErrorFromStatus (~/node_modules/@grpc/grpc-js/build/src/call.js:32:19)\n    at Object.onReceiveStatus (~/node_modules/@grpc/grpc-js/build/src/client.js:193:76)\n    at Object.onReceiveStatus (~/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:361:141)\n    at Object.onReceiveStatus (~/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:324:181)\n    at ~/node_modules/@grpc/grpc-js/build/src/resolving-call.js:135:78\n    at process.processTicksAndRejections (node:internal/process/task_queues:85:11)\nfor call at\n    at ServiceClientImpl.makeUnaryRequest (~/node_modules/@grpc/grpc-js/build/src/client.js:161:32)\n    at ServiceClientImpl.<anonymous> (~/node_modules/@grpc/grpc-js/build/src/make-client.js:105:19)\n    at ~/node_modules/@opentelemetry/instrumentation-grpc/build/src/clientUtils.js:131:31\n    at ~/node_modules/@opentelemetry/instrumentation-grpc/build/src/instrumentation.js:212:209\n    at AsyncLocalStorage.run (node:internal/async_local_storage/async_hooks:91:14)\n    at AsyncLocalStorageContextManager.with (~/node_modules/@opentelemetry/context-async-hooks/build/src/AsyncLocalStorageContextManager.js:33:40)\n    at ContextAPI.with (~/node_modules/@opentelemetry/api/build/src/api/context.js:60:46)\n    at ServiceClientImpl.clientMethodTrace [as export] (~/node_modules/@opentelemetry/instrumentation-grpc/build/src/instrumentation.js:212:42)\n    at ~/node_modules/@opentelemetry/otlp-grpc-exporter-base/build/src/grpc-exporter-transport.js:100:32\n    at new Promise (<anonymous>)","message":"14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED ::1:4317","code":"14","details":"No connection established. Last error: Error: connect ECONNREFUSED ::1:4317","metadata":"[object Object]","name":"Error"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: null)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: null)","name":"Error"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED ::1:4317)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED ::1:4317)","name":"Error"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317)","name":"Error"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317)","name":"Error"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED 127.0.0.1:4317)","name":"Error"}
{"stack":"Error: PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED ::1:4317)\n    at PeriodicExportingMetricReader._doRun (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:88:19)\n    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at async PeriodicExportingMetricReader._runOnce (~/node_modules/@opentelemetry/sdk-metrics/build/src/export/PeriodicExportingMetricReader.js:57:13)","message":"PeriodicExportingMetricReader: metrics export failed (error Error: 14 UNAVAILABLE: No connection established. Last error: Error: connect ECONNREFUSED ::1:4317)","name":"Error"}

Your Environment

Tried with Node.js 20.x and 22.x, same results.

Additional context

[aduh95]

OK so that's on me, I didn't properly exported all the env variables. Would it make sense to add a check to ensure the OTEL_EXPORTER_OTLP_ENDPOINT is correctly set in the env?