Fix metrics JMX domain for exporter visibility#49
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new Metrics() with no context registers MBeans under a default JMX
domain that the standard JMX Exporter config on Connect workers doesn't
scrape. Use KafkaMetricsContext("kafka.connect") so our metrics appear
alongside all other Connect metrics.
Adds a factory method DucklakeMetrics.createMetricsRegistry() to
centralize this and a JMX domain assertion test.
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Summary
new Metrics()registers MBeans under a default JMX domain that the standard JMX Exporter config on Connect workers doesn't scrapeKafkaMetricsContext("kafka.connect")so our metrics appear alongside all other Connect metrics in thekafka.connect:*domainDucklakeMetrics.createMetricsRegistry()factory to centralize registry constructionkafka.connectTest plan
kafka.connectJMX domain{__name__=~".*ducklake.*"}