[release-v1.11] Add metrics to monitor the ConsumerGroup replicas changes (#3386) #879
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…ve-extensions#3386) Understanding how KEDA scales up and down Knative Kafka resources is critical to debugging any performance problem that the autoscaler might introduce, so we need to expose new metrics that record mutations to Knative resources done by KEDA. `kafka_controller_consumer_group_expected_replicas` records number of expected replicas for a given Kafka consumer group resource. `kafka_controller_consumer_group_ready_replicas` records number of ready replicas for a given Kafka consumer group resource. Signed-off-by: Pierangelo Di Pilato <pierdipi@redhat.com>
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Cherry-pick of knative-extensions@9ef55f2