The GRPS protocol does not record tags in system metrics such as scenario and etc

[HarryHoudini]

Hi. Thank for Prometheus exporter and your job. This is only one solution for scrapping metrics with prometheus.

I encountered an error. When I started tests with custom tags in scenario for grpc service I receive error Not all tags used as labels from line https://github.com/szkiba/xk6-prometheus/blob/master/internal/prometheus.go#L114
I did't see scenario tag or another tag which I add in scenario script.

grpc test scenario.

import grpc from 'k6/net/grpc';
import { check, sleep } from 'k6';


export const options = {
  scenarios: {
    shared_iter_scenario: {
      executor: 'shared-iterations',
      vus: 10,
      iterations: 10000,
      startTime: '0s',
      tags: {
        testid: 'someTestId-for-shared',
      },
    },
    per_vu_scenario: {
      executor: 'per-vu-iterations',
      vus: 10,
      iterations: 1000,
      startTime: '5s',
      tags: {
        testid: 'someTestId-for-per-vu',
      },
    },
  },
};

const client = new grpc.Client();
client.load(['definitions'], 'hello.proto');

export default function () {
  client.connect('grpcb.in:9001', {
    // plaintext: false
  });

  const data = { greeting: 'Bert' };
  const response = client.invoke('hello.HelloService/SayHello', data);

  check(response, {
    'status is OK': (r) => r && r.status === grpc.StatusOK,
  });

  console.log(JSON.stringify(response.message));

  client.close();
  sleep(1);
};

http test scenario.

import http from 'k6/http';

export const options = {
scenarios: {
  shared_iter_scenario: {
    executor: 'shared-iterations',
    vus: 10,
    iterations: 10000,
    startTime: '0s',
    tags: {
      testid: 'someTestId-for-shared',
    },
  },
  per_vu_scenario: {
    executor: 'per-vu-iterations',
    vus: 10,
    iterations: 1000,
    startTime: '5s',
    tags: {
      testid: 'someTestId-for-per-vu',
    },
  },
},
};

export default function () {
http.get('https://test.k6.io/');
}

I'm getting this error only when start test for grpc service. When I start test for http protocol it's work as expected - all tags is setted.

http

k6_data_received{instance="k6-test-runner:5656", job="k6_job", scenario="per_vu_scenario", testid="someTestId-for-per-vu"} | 16995 @1685451227.496
-- | --
k6_data_received{instance="k6-test-runner:5656", job="k6_job", scenario="shared_iter_scenario", testid="someTestId-for-shared"} | 261966 @1685451227.496
k6_data_sent{instance="k6-test-runner:5656", job="k6_job", scenario="per_vu_scenario", testid="someTestId-for-per-vu"} | 438 @1685451227.496
k6_data_sent{instance="k6-test-runner:5656", job="k6_job", scenario="shared_iter_scenario", testid="someTestId-for-shared"}

grpc

k6_checks_sum{check="server is healthy", group="::setup", instance="k6-test-runner:5656", job="k6_job"} | 1 @1685453357.4961 @1685453362.4961 @1685453367.496
-- | --
k6_checks_sum{check="status is OK", instance="k6-test-runner:5656", job="k6_job"} | 4 @1685453362.4968 @1685453367.496
k6_data_received{group="::setup", instance="k6-test-runner:5656", job="k6_job"} | 213489 @1685453357.496213489 @1685453362.496213489 @1685453367.496
k6_data_received{instance="k6-test-runner:5656", job="k6_job"} | 10579 @1685453362.49621035 @1685453367.496
k6_data_sent{group="::setup", instance="k6-test-runner:5656", job="k6_job"} | 441 @1685453357.496441 @1685453362.496441 @1685453367.496
k6_data_sent{instance="k6-test-runner:5656", job="k6_job"}

I notice two things

1. Only iteration metrics have tags as label when I start test for grpc.

k6_iterations{instance="k6-test-runner:5656", job="k6_job", scenario="searchFast", testid="searchScenarios--002"} 

2. Custom tags work is good.

k6_errors_response_not_ok_sum{instance="k6-test-runner:5656", job="k6_job", scenario="searchFast", testid="searchScenarios--002"}

Below is screen from prometheus for same metrics for http and grpc.

[HarryHoudini]

@szkiba hello, maybe you need more information?

[szkiba]

Sorry for the delay. I'm asking for a little more patience, I'm on vacation, and then I'll start a new job. I can probably deal with the problem in mid-August.

[HarryHoudini]

Sorry, but it's still actual.