chore(zookeeper): Update major/minor versions for 26.11.0

Part of #1641.

Add: 3.9.6
Deprecate: 3.9.5
Remove: 3.9.4

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Please add to the Stackable Engineering project.

Update tasks

Update boil-config.toml to reflect the agreed upon versions in the spreadsheet (including the removal of old versions).
~~Update boil-config.toml to the latest supported version of JVM (base and devel).~~
~~Update other dependencies if applicable (eg: jmx_exporter, etc).~~
Initialize new product versions with patchable and add patches if applicable.
Delete old patch directories.
Check the corresponding operator (getting_started / kuttl / supported-versions) for usage of the versions.
Check other operators (getting_started / kuttl / supported-versions) for usage of the versions. Add the PR(s) to the list below.
Update the version in demos. Add the PR(s) to the list below.

Related Pull Requests

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Delete any items that do not apply so that all applicable items can be checked.
For example, if you add release notes to the documentation repository, you do not need the latter two criteria.

Acceptance

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This list should be completed by the assignee(s), once respective PRs have been merged. Once all items have been
checked, the issue can be moved into Development: Done.

Can build image (either locally, or in CI)
All kuttl tests pass (either locally, or in CI)
~~Release notes added to documentation and linked as a PR above~~
Release notes written in a comment below
Applicable release-note label added to this issue

Testing instructions

# Where x.y.z is the new version added in this PR
boil build zookeeper=x.y.z --strip-architecture --load

kind load docker-image oci.stackable.tech/sdp/zookeeper:x.y.z-stackable0.0.0-dev

# Change directory into the zookeeper-operator repository and update the
# product version in tests/test-definition.yaml
./scripts/run-tests --test-suite smoke-latest # or similar

Please consider updating this template if these instructions are wrong, or
could be made clearer.

The smoke-latest test fails with the new 3.9.6 image, because the ZooKeeper pods never become ready. The readiness probe (bash -c exec 3<>/dev/tcp/127.0.0.1/{} && echo srvr >&3 && grep '^Mode: ' <&3) seems to fail.

@NickLarsenNZ

@NickLarsenNZ (doing the heavy lifting) and I discovered the underlying issue is related to FIPS mode and client name verification during teh quorum TLS handshake.

@NickLarsenNZ raised in upstream issue here: https://issues.apache.org/jira/browse/ZOOKEEPER-5096

This (and the individual PRs) are blocked until we moved forward with one of the potential fixes.

The issue was fixed in stackabletech/zookeeper-operator@53481d9 (#1087).

Release Note

==== Supported versions

===== Product versions

====== New versions

* Apache ZooKeeper https://github.com/stackabletech/docker-images/issues/1658[3.9.6 (LTS)]

====== Deprecated versions

* Apache ZooKeeper https://github.com/stackabletech/docker-images/issues/1658[3.9.5]

====== Removed versions

* Apache ZooKeeper https://github.com/stackabletech/docker-images/issues/1658[3.9.4]

Done, closing.

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chore(zookeeper): Update major/minor versions for 26.11.0 #1658

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chore(zookeeper): Update major/minor versions for 26.11.0 #1658

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Techassi commented on Sep 16, 2026

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Techassi commented on Sep 23, 2026

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