v0.21.0-rc1

What's Changed

• chore(io-uring): Adjust uring default threads to 2 by @zuston in #570
• feat: Try to add agents.md by @zuston in #571
• feat(1/N)(coordinator): Introduce coordinator module by @zuston in #574
• fix(io-uring): Potential file leak on async-task missing by @zuston in #572
• feat: Align with the latest profiling in README by @zuston in #577
• fix(io-uring): fix use-after-move bug for splice_pipe by @zuston in #579
• feat: support read all for sync_io reading at IoMode::DIRECT_IO mode by @thuongle2210 in #582
• feat(memory): Dedicated buffer size tracking to speed up spill lookup by @thuongle2210 in #576
• feat(rpc): Abort core-affinity in aarch64 to improve performance by @zuston in #578
• fix: Distinguish ENOSPC from disk corruption in health check by @zuston in #589
• feat: Log the partitions that are split/huge for the first time by @zuston in #594
• feat: Add metric of time spent (ms) looking up memory spill partitions by @zuston in #595
• feat(urpc): add metric of urpc_request_number by @zuston in #596
• feat: allow client to configure app heartbeat timeout by @zuston in #599
• fix: avoid incorrect purge by rechecking app heartbeat timeout by @zuston in #598
• chore: Bump version to 0.21.0 by @zuston in #603

Full Changelog: v0.20.0-rc2...v0.21.0-rc1