Sourced from github.com/nats-io/nats-server/v2's releases.

Release v2.12.0

Changelog

Refer to the 2.12 Upgrade Guide for backwards compatibility notes with 2.11.x.

Go Version

• 1.25.1 (#7273)

Added

General

• Exponential backoff on route/gateway reconnection attempts (#7042, #7048)
• Added allow_insecure_cipher_suites configuration option to tls block, as insecure ciphers are now disabled by default (#7144)
• Added X25519MLKEM768 option to the TLS curve preferences (#7280)
• No responders errors from the server now include the original subject in the Nats-Subject header (#5250)
• Added exact_match field to the filtering of various monitoring endpoints for server name, host or cluster matching (#7260)

JetStream

• Atomic batch publishes (#6966, #7057, #7060, #7085, #7090, #7091, #7119, #7152, #7175, #7274, #7294, #7313, #7314, #7311, #7316, #7321, #7322, #7327, #7330)
  • Stage-and-commit style batches for JetStream message publishes with normal consistency checks
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-50.md
• Counter streams (#6973, #6988, #7081, #7118)
  • Counters are incremented or decremented by publishing to the stream with Nats-Incr headers, with full aggregate consistency over sources and mirrors
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-49.md
• Prioritised mode for consumer priority groups (#7113)
  • Allows for low-latency switching between clients based on the priority set
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-42.md
• Support for trusted proxies (#7153)
  • Allows enforcing that connections arrive via a NATS protocol-aware proxy
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-55.md
• Added the ability to promote mirrors to normal streams by removing the mirror configuration (#7171)
  • This allows a mirror to take over operation if the original stream is lost, for example in a disaster recovery scenario
  • This operation cannot be undone and also requires configuring the stream subjects to continue operation
• Added delayed message scheduling (#7170, #7245, #7319)
  • Implements single schedule messages using the Nats-Schedule-TTL message header
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-51.md
• Added support for offline assets (#7158)
  • Streams and consumers from a higher API version or using unsupported features (i.e. after a downgrade) will be marked as offline to prevent corruption
  • ADR: https://github.com/nats-io/nats-architecture-and-design/blob/main/adr/ADR-44.md
• Added partition(n) for deterministic hash-based partitioning and random(n) for non-deterministic random partitioning to subject transforms (#6950)
• Added the ability to specify the required API level in JetStream API requests with the Nats-Required-Api-Level request header (#7157)
• Added the ability for streams to opt into async writes (#7315, #7323)
• Add server_metadata block to server config, allowing arbitrary key-pairs to be set on a per-server basis, similar to stream/consumer metadata (#6935)
• Support for empty votes, which improves how the Raft election logic handles nodes that have lost their stable storage and attempt to rejoin the cluster regardless (#7038)
• Added "leader_since" to the stream and consumer info responses (#7189)

Leafnodes

... (truncated)

• fc6ec64 Release v2.12.0
• 53bf3e1 (2.12) Filestore fixes (#7334)
• 4e8adff De-flake TestFileStoreExpireMsgsOnStart by temporarily disabling encryption...
• b4479b8 De-flake TestFileStoreAgeLimit, TestNoRaceStoreReverseWalkWithDeletesPerf
• dd855ad Improve reuse & remove partials hangover from indexCacheBuf
• 8616072 Refactor filestore block pool
• 28e9650 Release v2.12.0-RC.6
• 3082724 (2.12) [FIXED] Atomic batch: batch timeout advisory (#7330)
• f30ba01 (2.12) Improve filestore cache expiry (#7331)
• be5d8e1 (2.12) Revert Green Tea GC on goreleaser builds (#7332)
• Additional commits viewable in compare view

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