`slack 21.0`: backport v22 VTOrc improvements, part 2#622

Merged

timvaillancourt merged 11 commits intoslack-21.0from

bp-v22-vtorc-opts-pt2.slack-21.0

Mar 17, 2025

Commits on Mar 12, 2025

`vtorc`: remove duplicate instance read from backend (#17834)
timvaillancourt
committed
`vtorc`: add index for `inst.ReadInstanceClusterAttributes` table scan (#17866)
timvaillancourt
committed
Add stats for shards watched by VTOrc, purge stale shards (#17815)
timvaillancourt
committed
Remove unused code in discovery queue creation (#17515)

GuptaManan100
authored and
timvaillancourt
committed
`vtorc`: cleanup discover queue, add concurrency flag (#17825)
timvaillancourt
committed
make compat with v21
timvaillancourt
committed

Commits on Mar 16, 2025

Commits on Mar 17, 2025