Release notes

This is the first Core release supporting protocol 22.

New features in protocol 22

• Constructor support in Soroban: https://github.com/stellar/stellar-protocol/blob/master/core/cap-0058.md.
• Soroban host functions for BLS12-381: https://github.com/stellar/stellar-protocol/blob/master/core/cap-0059.md.
• Update Soroban to use Wasmi register machine: https://github.com/stellar/stellar-protocol/blob/master/core/cap-0060.md.

What's Changed

• non-existent entries should not be metered by @ThomasBrady in #4428
• High performance getledgerentry by @SirTyson in #4350
• Enable background eviction by default & drop support for EXPERIMENTAL_BACKGROUND_EVICTION_SCAN by @SirTyson in #4416
• generalize support for multiple soroban hosts by @graydon in #4434
• Check error type by @sisuresh in #4438
• Fix test to not load unused setting by @sisuresh in #4440
• Visual Studio/MSVC build fixes by @dmkozh in #4443
• Soroban upgrades for simulation tests by @ThomasBrady in #4413
• Add support for Soroban constructors (CAP-58) by @dmkozh in #4442
• docs: add overlay intro and fix typos by @marta-lokhova in #4420
• bugfix: guard access to mNoOutboundCapacity by @marta-lokhova in #4458
• Windows fixes by @MonsieurNicolas in #4449
• initial commit: Jupyter notebook to help estimate network settings by @MonsieurNicolas in #4452
• Switch Soroban tests to always use closeLedger to apply txs. by @dmkozh in #4455
• Fix exception-safety in callbacks from Rust to C++ by @graydon in #4463
• Switch read-only LedgerTxn to BucketList snapshots by @marta-lokhova in #4431
• Cache BL snapshot for re-use by @marta-lokhova in #4465
• ✍🏿 Capitalize headers for clarity by @JFWooten4 in #4460
• Change default test backend to BucketListDB by @SirTyson in #4462
• Use TESTDB_IN_MEMORY_OFFERS in BucketListIsConsistentWithDatabaseTests by @sisuresh in #4466
• Bucket entry counters and metrics by @ThomasBrady in #4436
• Update weight function to fix bias in nomination by @bboston7 in #4453
• Add 'phase 1' testnet settings that we need to apply after every reset. by @dmkozh in #4467
• Apply time benchmarking by @sisuresh in #4402
• tx queue update by @sisuresh in #4468
• Add SOROBAN_TEST_EXTRA_PROTOCOL for side-by-side testing by @graydon in #4439
• Fix compiler error when tests are disabled by @SirTyson in #4472
• Update Core to protocol 22. by @dmkozh in #4464
• Multiple rust libraries with submodules by @graydon in #4456
• use --all-targets on cargo tree by @graydon in #4474
• Added Ubuntu 24.04 clang-format-12 install instructions by @SirTyson in #4476
• Bump to latest end and update contract cost params for V22 by @sisuresh in #4475
• Try stamp files rather than group rules for sequencing by @graydon in #4478
• Bump env to version with wasmi 0.36.1 by @graydon in #4482
• Fix upgrade validation by @sisuresh in #4485
• Testutils bug(s) by @graydon in #4489

New Contributors

• @JFWooten4 made their first contribution in #4460

Full Changelog: v21.3.1...v22.0.0rc1