Demonstrating high cpu-usage in KafkaStreamsMetrics for micrometer 1.7.4

Needs kafka running on localhost:9092 (https://docs.confluent.io/platform/current/quickstart/ce-docker-quickstart.html)

Start two instances of the application: ./mvnw spring-boot:run

Restart one instance occasionally to trigger rebalances.

io.micrometer.core.instrument.binder.kafka.KafkaMetrics.registeredMeters should increase for each scheduled call to checkAndBindMetrics