no issue
Began tracking the following metrics when purging the redis cache:
1. cache_reset_scan - total time to scan the keyspace
2. cache_reset_delete - total time to delete all the matching keys
3. cache_reset - total time in ms to reset the cache
4. cache_reset_keys - total number of keys deleted
We can reduce the granularity of these alerts to reduce the load on
elastic eventually, but for now it would be nice to collect metrics at
this granularity so we can optimize the cache purging performance.
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