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OSDOCS-21866: Add 4.21.31 z-stream release notes #119020

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OSDOCS-21866: Add 4.21.31 z-stream release notes #119020

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41 changes: 41 additions & 0 deletions modules/zstream-4-21-31.adoc
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// Module included in the following assemblies:
//
// * release_notes/ocp-4-21-release-notes.adoc

:_mod-docs-content-type: REFERENCE
[id="zstream-4-21-31_{context}"]
= RHBA-2026:60477 - {product-title} {product-version}.31 bug fix and security update

Issued: 01 September 2026

[role="_abstract"]
{product-title} release {product-version}.31 is now available with updates to packages and images that fix several bugs.

The following advisory contains the container images for this release:

link:https://access.redhat.com/errata/RHBA-2026:60477[RHBA-2026:60477]

The following advisory contains the RPM packages for this release:

link:https://access.redhat.com/errata/RHBA-2026:xxxxx[RHBA-2026:xxxxx]

Space precludes documenting all of the container images for this release. See the following Release Notes documentation for details about these changes:

link:https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes[{product-title} {product-version} Release Notes]

This update includes the following images:

[source,terminal]
----
$ oc adm release info 4.21.31 --pullspecs
----

[id="zstream-4-21-31-fixed-issues_{context}"]
== Fixed issues

* Previously the Go OpenSSL FIPS provider would potentially overwhelm libcrypto with concurrent requests leading to processes hitting the Go maxThreads limit of 10,000 and crashing. The Go OpenSSL FIPS provider has been updated to limit concurrent requests to libcrypto to 4x the number of CPUs buffering requests as lightweight Goroutines and avoiding the maxThreads limit preventing a crash. (link:https://issues.redhat.com/browse/OCPBUGS-112086[OCPBUGS-112086])

[id="zstream-4-21-31-updating_{context}"]
== Updating

To update an {product-title} 4.21 cluster to this latest release, see xref:../updating/updating_a_cluster/updating-cluster-cli.adoc#updating-cluster-cli[Updating a cluster using the CLI].
3 changes: 3 additions & 0 deletions release_notes/ocp-4-21-release-notes.adoc
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Expand Up @@ -47,6 +47,9 @@ include::modules/rn-ocp-release-notes-known-issues.adoc[leveloffset=+1]
// Asynchronous errata updates
include::modules/rn-async-errata.adoc[leveloffset=+1]

// 4.21.31 RNs and updating
include::modules/zstream-4-21-31.adoc[leveloffset=+2]

// 4.21.30 RNs and updating
include::modules/zstream-4-21-30.adoc[leveloffset=+2]

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