bbejeck commented on code in PR #17781:
URL: https://github.com/apache/kafka/pull/17781#discussion_r1841149379
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AsyncKafkaConsumer.java:
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@@ -641,17 +641,15 @@ private void updateGroupMetadata(final Optional<Integer>
memberEpoch, final Stri
@Override
public void registerMetricForSubscription(KafkaMetric metric) {
- if (clientTelemetryReporter.isPresent()) {
- ClientTelemetryReporter reporter = clientTelemetryReporter.get();
- reporter.metricChange(metric);
+ if (!metrics().containsKey(metric.metricName())) {
+ clientTelemetryReporter.ifPresent(reporter ->
reporter.metricChange(metric));
Review Comment:
I took another pass over the telemetry code - it generally shouldn't be a
problem to re-register an existing metric but we shouldn't allow a "back door"
to updating existing consumer metrics.
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