Arne Klein created KAFKA-19398:
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Summary: Error getting oldest-iterator-open-since-ms causes NPE in
micrometer
Key: KAFKA-19398
URL: https://issues.apache.org/jira/browse/KAFKA-19398
Project: Kafka
Issue Type: Bug
Affects Versions: 4.0.0, 3.9.1
Reporter: Arne Klein
After the fix for https://issues.apache.org/jira/browse/KAFKA-17954 was
applied, Micrometer can now run into a null pointer exception when reading the
`kafka.stream.state.oldest.iterator.open.since.ms` metric.
java.lang.NullPointerException: Cannot invoke "java.lang.Number.doubleValue()"
because the return value of "org.apache.kafka.common.Metric.metricValue()" is
null
at
io.micrometer.core.instrument.binder.kafka.KafkaMetrics.toDouble(KafkaMetrics.java:326)
~[micrometer-core-1.14.7]
at
io.micrometer.core.instrument.binder.kafka.KafkaMetrics.lambda$toMetricValue$6(KafkaMetrics.java:322)
~[micrometer-core-1.14.7]
While the NPE can also be fixed in
[Micrometer|https://github.com/micrometer-metrics/micrometer/issues/6324#issuecomment-2960557766],
I'm unsure if this is the intended behaviour for emitting metrics.
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