(kafka) branch 4.3 updated: KAFKA-20331, KAFKA-20240: Update upgrade.md for new KIP-1263 configs in 4.3 (#21822)

[da...@apache.org]

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dajac pushed a commit to branch 4.3
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The following commit(s) were added to refs/heads/4.3 by this push:
     new 4f887129374 KAFKA-20331, KAFKA-20240: Update upgrade.md for new KIP-1263 configs in 4.3 (#21822)
4f887129374 is described below

commit 4f88712937429261e5b79987fdcaef2ff4004992
Author: Sean Quah <sq...@confluent.io>
AuthorDate: Tue Apr 7 12:37:49 2026 +0100

    KAFKA-20331, KAFKA-20240: Update upgrade.md for new KIP-1263 configs in 4.3 (#21822)
    
    Reviewers: David Jacot <dj...@confluent.io>
---
 docs/getting-started/upgrade.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/getting-started/upgrade.md b/docs/getting-started/upgrade.md
index 05721adc356..42dd0991e56 100644
--- a/docs/getting-started/upgrade.md
+++ b/docs/getting-started/upgrade.md
@@ -40,6 +40,8 @@ type: docs
   * Support for cordoning log directories: For further details, please refer to [KIP-1066](https://cwiki.apache.org/confluence/x/Lg_TEg).
   * The `group.coordinator.rebalance.protocols` configuration is deprecated and will be removed in Kafka 5.0. In Kafka 5.0, all protocols will always be enabled and controlled solely by feature versions (`group.version`, `streams.version`, `share.version`) via `kafka-features.sh`. For further details, please refer to [KIP-1237](https://cwiki.apache.org/confluence/x/jIqmFw).
   * New group configs have been introduced: `share.delivery.count.limit`, `share.partition.max.record.locks` and `share.renew.acknowledge.enable`, along with equivalent broker configs for specifying minimum and maximum values. In addition, the validation of group configs has been improved. For further details, please refer to [KIP-1240](https://cwiki.apache.org/confluence/x/tIHMFw).
+  * A new `group.coordinator.background.threads` config has been added to control the size of the group coordinator's thread pool used to updating regular expression subscriptions. Previously, the thread pool only had a single thread. Now the thread pool has two threads by default and its size is configurable. For further details, please refer to [KIP-1263](https://cwiki.apache.org/confluence/x/DIE8G).
+  * New `group.consumer.assignment.interval.ms`, `group.share.assignment.interval.ms` and `group.streams.assignment.interval.ms` configs have been added to set the interval between assignment updates for consumer, share and streams groups, along with broker configs for specifying minimum and maximum values and group configs. These default to an interval of 1 second and previously had an effective value of 0. For further details, please refer to [KIP-1263](https://cwiki.apache.org/conflue [...]
 
 ## Upgrading to 4.2.0