thanos

-- There is still a performance regression in this release https://github.com/thanos-io/thanos/issues/8549 that we are working on fixing --

This fix fixes a performance regression in the gRPC layer.

What's Changed

• Pull extgrpc fix and release 0.40.1 by @GiedriusS in https://github.com/thanos-io/thanos/pull/8547

Full Changelog: https://github.com/thanos-io/thanos/compare/v0.40....

v0.40.0 - 2025 10 27

Fixed

• #8334 Query: wait for initial endpoint discovery before becoming ready
• #8486 Receive: fix exemplar label corruption from Cap'n Proto memory references
• [#8499](https://github.com/thanos-io/thanos/pu...

v0.40.0-rc.0 - 2025 10 20

Fixed

• #8334 Query: wait for initial endpoint discovery before becoming ready
• #8486 Receive: fix exemplar label corruption from Cap'n Proto memory references
• [#8499](https://github.com/thanos-io/than...

Fixes two issues with the distributed query engine.

Fixed

• #8374 Query: fix panic when concurrently accessing annotations map
• #8375 Query: fix native histogram buckets in distributed queries

Full Changelog: https://github.com/thanos-io/thanos/compare/v0.39.1...v0.39.2

Fixes a memory leak issue on query-frontend. The bug only affects v0.39.0.

Fixed

• #8349 Query-Frontend: properly clean up resources
• #8338 Query-Frontend: use original roundtripper + close immediately

Full Changelog: https://github.com/thanos-io/thanos/compare/v0.39.0...v0.39.1