Release Notes for v24.3-v24.3.21 (#20586)

* Update release notes for v24.3-v24.3.21

Author: release-notes-automation[bot]

src/current/_data/releases.yml

@@ -9647,6 +9647,41 @@
   previous_release: v24.1.24
   cloud_only: true
   cloud_only_message_short: 'Available only for select CockroachDB Cloud clusters'
+  cloud_only_message: >
+      This version is currently available only for select
+      CockroachDB Cloud clusters. To request to upgrade
+      a CockroachDB self-hosted cluster to this version,
+      [contact support](https://support.cockroachlabs.com/hc/requests/new).
+
+      
+- release_name: v24.3.21
+  major_version: v24.3
+  release_date: '2025-10-17'
+  release_type: Production
+  go_version: go1.23.12
+  sha: 1b38d62fc62e6a54d9f6aa92a085421b5d4b5032
+  has_sql_only: true
+  has_sha256sum: true
+  mac:
+    mac_arm: true
+    mac_arm_experimental: true
+    mac_arm_limited_access: false
+  windows: true
+  linux:
+    linux_arm: true
+    linux_arm_experimental: false
+    linux_arm_limited_access: false
+    linux_intel_fips: true
+    linux_arm_fips: false
+  docker:
+    docker_image: cockroachdb/cockroach
+    docker_arm: true
+    docker_arm_experimental: false
+    docker_arm_limited_access: false
+  source: true
+  previous_release: v24.3.20
+  cloud_only: true
+  cloud_only_message_short: 'Available only for select CockroachDB Cloud clusters'
   cloud_only_message: >
       This version is currently available only for select
       CockroachDB Cloud clusters. To request to upgrade

src/current/_includes/releases/v24.3/v24.3.21.md

@@ -0,0 +1,15 @@
+## v24.3.21
+
+Release Date: October 17, 2025
+
+{% include releases/new-release-downloads-docker-image.md release=include.release %}
+
+<h3 id="v24-3-21-bug-fixes">Bug fixes</h3>
+
+- Fixed a bug where an `INSERT` statement could fail with a type checking error while adding a `BIT(n)` column. [#153604][#153604]
+- Fixed a bug that caused panics when executing `COPY` into a table with hidden columns and expression indexes. The panic only occurred when the session setting `expect_and_ignore_not_visible_columns_in_copy` was enabled. This bug was introduced with `expect_and_ignore_not_visible_columns_in_copy` in v22.1.0. [#154284][#154284]
+- Fixed a bug where the presence of duplicate temporary tables in a backup caused the restore to fail with an error containing the text `restoring table desc and namespace entries: table already exists`. [#154399][#154399]
+
+[#153604]: https://github.com/cockroachdb/cockroach/pull/153604
+[#154284]: https://github.com/cockroachdb/cockroach/pull/154284
+[#154399]: https://github.com/cockroachdb/cockroach/pull/154399