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

Release v2.12.2

Changelog

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

Go Version

• 1.25.4 (#7520)

Dependencies

• github.com/klauspost/compress v1.18.1 (#7474)
• github.com/nats-io/nats.go v1.47.0 (#7474)
• golang.org/x/sys v0.38.0 (#7538)
• github.com/minio/highwayhash 070ab1a (#7539)

Added

General

• Support for the PROXY protocol (v1 and v2) for client connections, when proxy_protocol: true is set in the config (#7456)

JetStream

• Added meta_compact and meta_compact_size, advanced JetStream config options to control how many log entries must be present in the metalayer log before snapshotting and compaction takes place (#7484, #7521)
• Added write_timeout option for clients, routes, gateways and leafnodes which controls the behaviour on reaching the write_deadline, values can be default, retry or close (#7513)

Monitoring

• Added expvar /debug/vars endpoint to the monitoring port (#7469)
• Meta cluster snapshot statistics have been added to the /jsz endpoint (#7524)
• The /jsz endpoint can now show direct consumers with the direct-consumers?true flag (#7543)

Improved

General

• Binary stream snapshots are now preferred by default for nodes on new route connections (#7479)
• Reduced allocations in the sublist and subject transforms (#7519)

JetStream

• Improved the logging for observer mode (#7433)
• Improve interest detection when consumers are created or deleted across different servers (#7440)
• Improved the performance of enforcing max_bytes and max_msgs limits (#7455)
• Streams and consumers will no longer unnecessarily snapshot when being removed or scaling down (#7495)
• Streams are now loaded in parallel when enabling JetStream, often reducing the time it takes to start up the server (#7482, #7526)
• Log lines and errors related to offline/unsupported assets are now clearer (#7416, #7425)
• Stream catchups will now use delete ranges more aggressively, speeding up catchups of large streams with many interior deletes (#7512)
• Streams with subject transforms can now implicitly republish based on those transforms by configuring > for both republish source and destination (#7515)

... (truncated)

• 9831cbc Release v2.12.2
• e3586a0 Cherry-picks for v2.12.2 (#7547)
• 58f1e66 Fix deadlock on stream purge when consumer store returns error
• 9dd65fb Release v2.12.2-RC.4
• d7a1919 Cherry-picks for v2.12.2-RC.4 (#7542)
• dec1ef4 Accept both proxied and non-proxied client connections when enabled
• 03058c7 Add opt-in support for the PROXY protocol
• 79d3474 De-flake TestMonitorJsz
• 57199cc Add direct-consumers flag to jsz monitoring endpoint
• f28c366 Use concrete highwayhash Digest64 instead of hash interface
• Additional commits viewable in compare view

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