[CapMan visibility] bytes_scanned_window_policy DD metric #6081
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In a previous PR, we emit a Sentry warning and a GCP log for every query throttled by Snuba's capacity management system. However, we quickly realized a large volume of queries were throttled.
A potential solution we came up with is to sample the number of throttled queries we emit warnings and logging for, but before this, we realized that every throttled query I manually inspected from GCP logs is throttled by BytesScannedWindowAllocationPolicy, a policy we plan on deprecating anyways. A possible explanation of this occurrence is that BytesScannedWindowPolicy does not reject queries - it only throttles them.
We use this PR to answer 2 questions: