*: add CHANGELOG, update VERSION (#8320)

Prepare for 0.39.0-rc.0.

Signed-off-by: Giedrius Statkevičius <[email protected]>

Author: GiedriusS

CHANGELOG.md

@@ -8,24 +8,25 @@ NOTE: As semantic versioning states all 0.y.z releases can contain breaking chan
 
 We use *breaking :warning:* to mark changes that are not backward compatible (relates only to v0.y.z releases.)
 
-## Unreleased
-- [#8190](https://github.com/thanos-io/thanos/pull/8190) Fix markdown formatting in CHANGELOG.
-- [#8202](https://github.com/thanos-io/thanos/pull/8202) Receive: Unhide `--tsdb.enable-native-histograms` flag
-- [#8225](https://github.com/thanos-io/thanos/pull/8225) tools: Extend bucket ls options.
-- [#8282](https://github.com/thanos-io/thanos/pull/8282) Force sync writes to meta.json in case of host crash
-- [#8308](https://github.com/thanos-io/thanos/pull/8308) Receive: Prometheus counters for pending write requests and series requests
+### [v0.39.0-rc.0](https://github.com/thanos-io/thanos/tree/release-0.39) - 2025 06 19
+
+In short: there are a bunch of fixes and small improvements. The shining items in this release are memory usage improvements in Thanos Query and shuffle sharding support in Thanos Receiver. Information about shuffle sharding support is available in the documentation. Thank you to all contributors!
 
 ### Added
 
+- [#8308](https://github.com/thanos-io/thanos/pull/8308) Receive: Prometheus counters for pending write requests and series requests
+- [#8225](https://github.com/thanos-io/thanos/pull/8225) tools: Extend bucket ls options.
 - [#8238](https://github.com/thanos-io/thanos/pull/8238) Receive: add shuffle sharding support
 - [#8284](https://github.com/thanos-io/thanos/pull/8284) Store: Add `--disable-admin-operations` Flag to Store Gateway
-- [#8266](https://github.com/thanos-io/thanos/pull/8266) Website: maintain expanded state based on current page
 - [#8245](https://github.com/thanos-io/thanos/pull/8245) Querier/Query-Frontend/Ruler: Add `--enable-feature=promql-experimental-functions` flag option to enable using promQL experimental functions in respective Thanos components
 - [#8259](https://github.com/thanos-io/thanos/pull/8259) Shipper: Add `--shipper.skip-corrupted-blocks` flag to allow `Sync()` to continue upload when finding a corrupted block
 
 ### Changed
 
+- [#8282](https://github.com/thanos-io/thanos/pull/8282) Force sync writes to meta.json in case of host crash
 - [#8192](https://github.com/thanos-io/thanos/pull/8192) Sidecar: fix default get config timeout
+- [#8202](https://github.com/thanos-io/thanos/pull/8202) Receive: Unhide `--tsdb.enable-native-histograms` flag
+- [#8315](https://github.com/thanos-io/thanos/pull/8315) Query-Frontend: only ready if downstream is ready
 
 ### Removed
 - [#8289](https://github.com/thanos-io/thanos/pull/8289) Receive: *breaking :warning:* Removed migration of legacy-TSDB to multi-TSDB. Ensure you are running version >0.13

VERSION

@@ -1 +1 @@
-0.39.0-dev
+0.39.0-rc.0