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Remove banzai Prometheus metrics

Bob Van Landuyt requested to merge bvl-remove-banzai-metrics into master

Remove banzai Prometheus metrics

These metrics were high cardinality, they get emitted from a lot of different pods. Because these metrics include a lot of different buckets, this resulted in a total of more than 40k series at peak traffic.

Reducing the number of metrics emitted from the ruby application will reduce the memory pressure on Prometheus, and improve scrape performance on both sides.

Edited by Bob Van Landuyt

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