support estimated number of keys for api /metrics/backend
Open
feature
improvement
- Dominant language
- Java
- Stars
- 3.2k
- Forks
- 636
- Avg merge
- 3d 11h
- Merged PRs (30d)
- 14
Description
1. use backend api like rocksdb [kEstimateNumKeys](https://github.com/facebook/rocksdb/blob/e8263dbdaad0546c54bddd01a8454c2e750a86c2/db/internal_stats.cc#L302)
2. or use HLL counting
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