v21.3.0rc1

Stability improvements

• Add a way to get entry sizes in XDR query tool. by @dmkozh in #4325
• Rename debug info gathering script by @jacekn in #4381
• Write line identifying Catch2 test interface in --help output of test builds by @graydon in #4363
• Make outbound queue metrics more accurate by @marta-lokhova in #4386
• Cleanup outdated surge pricing logic. by @dmkozh in #4383
• Add redis-tools as a test-only docker dependency by @jayz22 in #4390
• Only test SCP driver with the current and prev protocol. by @dmkozh in #4400
• Stop removing the cargo directory in ci-build.sh by @sisuresh in #4406
• Harden survey script to various failures by @bboston7 in #4407
• Harden handling of tx size upgrades in herder and add tests by @marta-lokhova in #4405
• TransactionFrame Refactor by @SirTyson in #4307. This change makes TransactionFrame immutable.
• Fix prefetch tests by @SirTyson in #4410
• Fixed assert failure when Soroban tx was sumbitted pre p20 by @SirTyson in #4414
• Remove protocol-specific assert from TxSetUtils::getInvalidTxList by @marta-lokhova in #4417
• Remove usage of reduce in maxReadQuotaForKey, simplify accounting data structure by @ThomasBrady in #4419
• Fixed assert failure when banning txs by @SirTyson in #4422
• harden simulation tests by @marta-lokhova in #4423
• Ensure unique preimages during loadgen upgrade setup by @bboston7 in #4425
• Binary fuse filter by @SirTyson in #4389. This change will cause first restart after the upgrade to take a few minutes.

Breaking Changes

• Deprecate obsolete txfeehistory table by @marta-lokhova in #4385
• Mandate flow control in bytes by @bboston7 in #4353 drops support for ENABLE_FLOW_CONTROL_BYTES, as the feature is now required.

New Features

• Self-report drifting clock by @marta-lokhova in #4101

Full Changelog: v21.2.0...v21.3.0