Noticed this while investigating T181333: cpjobqueue spamming statsd metrics. It looks like change-prop is creating a lot of kafka topics with distinct names, this fact is reflected by metrics created by mirrormaker, e.g.:
/var/lib/carbon/whisper/kafka/mirror/main-eqiad_to_analytics/kafka-mirror/kafka1012_eqiad_wmnet_9997/kafka/producer/producer-topic-metrics/eqiad_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_mediawiki_job_updateBetaFeaturesUserCounts_kafka-mirror-main-eqiad_to_analytics-kafka1012-producer/record-error-rate.wsp /var/lib/carbon/whisper/kafka/mirror/main-eqiad_to_analytics/kafka-mirror/kafka1012_eqiad_wmnet_9997/kafka/consumer/ConsumerTopicMetrics/BytesPerSec_eqiad_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_change-prop_retry_mediawiki_job_flaggedrevs_CacheUpdate_kafka-mirror-main-eqiad_to_analytics-0/Count.wsp