Fix metric deletion on group delete #800
Merged
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This PR contains 2 related fixes:
Deleting ALL metrics of a consumer group
The
burrow_kafka_topic_partition_status
metric for a deleted consumer group was dangling because we neglected to clear the corresponding gauge.Fixes #797
Handling the case when user only deletes a specific consumer group's topic
Previously, we deleted all consumer group metrics when a group's topic was deleted. With this change we make sure to check for the case where a topic is provided (i.e. user wants to delete only a specific topic of a consumer group) and delete only the metrics that match both consumer group and topic.