kafka metrics : label kafka_version=unknown in native mode

[amkac]

Describe the bug

In native mode only the property 'kafka_version' does not apppear in the kafka_metrics, the value is always UNKNOWN. this issue does not occur in the jvm mode.

Expected behavior

kafka_consumer_successful_authentication_rate{client_id=.... ",kafka_version="3.7.0"} 0.10734796843969728

Actual behavior

kafka_consumer_successful_authentication_rate{client_id=.... ",kafka_version="unknown"} 0.10734796843969728

How to Reproduce?

1. Build the app in native mode: mvn clean install -Pnative
2. Search for kafka metrics on /q/metrics

Output of uname -a or ver

No response

Output of java -version

21

Quarkus version or git rev

3.10.2

Build tool (ie. output of mvnw --version or gradlew --version)

Maven 3.9

Additional information

No response

[quarkus-bot]

/cc @alesj (kafka), @cescoffier (kafka), @ebullient (metrics), @jmartisk (metrics), @ozangunalp (kafka), @zakkak (native-image)

[cescoffier]

Seems to be an issue in the micrometer binder.

The KAfka version is set in:

void prepareToBindMetrics(MeterRegistry registry) {
        this.metrics.set(this.metricsSupplier.get());
        Map<MetricName, ? extends Metric> metrics = this.metrics.get();
        // Collect static metrics and tags
        Metric startTimeMetric = null;

        for (Map.Entry<MetricName, ? extends Metric> entry : metrics.entrySet()) {
            MetricName name = entry.getKey();
            if (METRIC_GROUP_APP_INFO.equals(name.group()))
                if (VERSION_METRIC_NAME.equals(name.name())) {
                    kafkaVersion = (String) entry.getValue().metricValue();
                }
                else if (START_TIME_METRIC_NAME.equals(name.name())) {
                    startTimeMetric = entry.getValue();
                }
        }

        if (startTimeMetric != null) {
            MetricName startTimeMetricName = startTimeMetric.metricName();
            bindMeter(registry, startTimeMetric, meterName(startTimeMetricName), meterTags(startTimeMetricName));
        }
    }

For some reason, there is no version in native ("unknown" is the default one).