Unable to see Grpc Metrics being emitted by ConsoleMetricExporter for a GRPC Client that is continuously making Unary Calls

[rathsai]

Hi,

I have been trying to see metrics printed for instruments like grpc.client.attempt. duration, grpc.client.call.duration , etc as per mentioned in the doc: https://grpc.io/docs/guides/opentelemetry-metrics/#client-per-attempt-instruments

However, I have been trying to set this up multiple times and haven't been able to. My sample instrumentation file contains

import { NodeSDK } from '@opentelemetry/sdk-node'
import {
  ConsoleMetricExporter,
  PeriodicExportingMetricReader,
} from '@opentelemetry/sdk-metrics'
import {GrpcInstrumentation} from "@opentelemetry/instrumentation-grpc";

// For troubleshooting, set the log level to DiagLogLevel.DEBUG
// import {diag, trace, DiagConsoleLogger, DiagLogLevel} from "@opentelemetry/api";
// diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.VERBOSE)


const openTelemetrySDK = new NodeSDK({
  metricReader: new PeriodicExportingMetricReader({
    exporter: new ConsoleMetricExporter(),
    exportIntervalMillis: 1000
  }),
  instrumentations: [
    new GrpcInstrumentation({
      enabled: true
    })
  ]
})

// This method monkey patches the grpc client classes and injects the OpenTelemetry methods.
openTelemetrySDK.start()

process.on('SIGTERM', () => {
  openTelemetrySDK.shutdown().then(
    () => console.info('SDK shutdown successfully'),
    err => console.info('Error shutting down SDK', err),
  )
})

// This must be the first thing that needs to be imported or before the first import of grpc-js happens.
export default openTelemetrySDK

Dependencies

"@opentelemetry/auto-instrumentations-node": "^0.54.0",
    "@opentelemetry/instrumentation": "^0.56.0",
    "@opentelemetry/instrumentation-grpc": "^0.56.0",
    "@opentelemetry/sdk-metrics": "^1.29.0",
    "@opentelemetry/sdk-node": "^0.56.0",
    "@opentelemetry/sdk-trace-node": "^1.29.0",
    "@opentelemetry/resources": "^1.29.0",
    "@opentelemetry/semantic-conventions": "^1.28.0",

And to run my main file, I use the command npx ts-node --require ./src/instrumentation.ts src/greeter_client.ts. if I enable diag DEBUG logging, then I can see all those trace logs containing the grpc status, method, service_name, status_code, etc. However, I am unable to see any histogram type metrics for the continuously fired Unary Call from src/greeter_client.ts.

Next, while searching around for solutions, I stumbled upon this doc https://opentelemetry.io/docs/languages/js/getting-started/nodejs/ and using the suggestion, I only started receiving http instrument metrics but not grpc instrument metrics.

Any idea how I can setup ?

• [x ] This only affects the JavaScript OpenTelemetry library
• This may affect other libraries, but I would like to get opinions here first

[pichlermarc]

Hi @rathsai - metrics for gRPC are curently not implemented yet. Implementation is currently blocked by semantic conventions updates. I created an issue to track this #5250 and the blockers for implementation.

[pichlermarc]

@rathsai - I'll close this issue as we now have a documented path forward for this feature (#5250) - if there are any additional questions, please feel free to comment over at #5250. Thanks 🙂