[dependabot]

Bumps github.com/nats-io/nats-server/v2 from 2.15.0 to 2.15.1.

Release notes

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

Release v2.15.1

Changelog

Refer to the 2.15 Upgrade Guide for backwards compatibility notes with 2.14.x.

Go Version

• 1.27.2 (#8740)

Dependencies

• github.com/klauspost/compress v1.20.1 (#8737)
• github.com/nats-io/nats.go v1.53.1 (#8737)

Changed

JetStream

• The max_ha_assets limit is now enforced consistently by the metalayer leader during stream and consumer placement, scaling and moves (#8639)

Gateways

• Support for sending and handling the legacy $GR. reply prefix, used by servers prior to v2.1.2, has been removed (#8615)

Improved

JetStream

• Stalled source and mirror flow control is now reported in stream info and warning logs, making missing $JS.FC.> imports or exports easier to diagnose (#8633)
• Stream and consumer placement now prefers peers that have caught up with the metalayer, reducing delays in API responses (#8643)
• Improved the performance of deleting entries from and encoding AVL sequence sets (#8646)
• Fast batch publish now reports backward sequence gaps as well as forward gaps (#8699)
• Stream pending message calculations avoid unnecessary filestore cache access and handle deleted sequence ranges more efficiently (#8680, #8681)
• Stream restore format detection now stops after the first S2 chunk (#8693)
• Stream restore waits for the preferred node to become leader, avoiding an incorrect create response during clustered restore (#8690)
• Memory backed streams avoid copying message headers and bodies twice when storing messages (#8652, contributed by @​randomizedcoder)

Monitoring

• Leafz now reports whether a leafnode connection uses WebSockets (#8683)

MQTT

• QoS2 PUBLISH and PUBREL processing is now pipelined for increased throughput (#8416, contributed by @​levb)
• Reduced allocations and buffer copying when processing QoS1 and QoS2 messages and issuing JetStream store and delete requests (#8624, #8625, contributed by @​levb)
• Partial packets are no longer copied in full on every read, reducing allocations and buffer copying (#8692)

Fixed

General

... (truncated)

Commits

• b2fd3ef Release v2.15.1
• 5502536 Update to Go 1.27.2/1.26.9
• 2f50d04 Cherry-picks for 2.15.1 (#164)
• ff5047c Fix TestJetStreamClusterKeyValueLastSeqMismatch
• bd33432 Update GHA dependencies
• 86bf9f1 Update Go dependencies
• c4aea1c [FIXED] Leafnode interest and request/reply across account imports
• 04869d4 [FIXED] Recovered ephemeral pull consumer never deleted
• 51d0113 De-flake TestJetStreamAtomicBatchPublishRejectPartialBatchOnLeaderChange
• 21344fd NRG: Re-send vote request of preferred candidate
• Additional commits viewable in compare view

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