[publick8s cluster] Azure publick8s Upgrade to Kubernetes 1.31.6

accounts.jenkins.io admin.accounts.jenkins.io cert.ci.jenkins.io ci.jenkins.io get.jenkins.io incrementals.jenkins.io infra.ci.jenkins.io issues.jenkins.io javadoc.jenkins.io jenkins-wiki-exporter.jenkins.io jenkins.io ldap.jenkins.io mirrors.jenkins-ci.org mirrors.jenkins.io plugin-health.jenkins.io plugin-site-issues.jenkins.io plugins.jenkins.io plugins.origin.jenkins.io release.ci.jenkins.io reports.jenkins.io stories.jenkins.io trusted.ci.jenkins.io uplink.jenkins.io wiki.jenkins.io weekly.ci.jenkins.io www.jenkins.io

[Final Message] upgrade went well, no impact on production.

[Initial Message] Thursday 24 April 2025, at 07:30PM UTC, we’ll upgrade the AKS(Azure) cluster publick8s to Kubernetes 1.31.6. It should take between 60 and 120 min.

The expected impacts are:

⚠️ Last Kubernetes upgrade (to 1.30) we saw an outage on update-center (updates.jenkins.io) for a few seconds !

Restart of the following services, with a downtime between 2 and 15 min (depends on Azure Storage systems):

• ldap.jenkins.io
• weekly.ci.jenkins.io
• incrementals.jenkins.io

Temporary disruptions (no Log-in/log-out possible during the LDAP restart) on:

• accounts.jenkins.io
• ci.jenkins.io, trusted.ci.jenkins.io, infra.ci.jenkins.io, weekly.ci.jenkins.io, release.ci.jenkins.io, cert.ci.jenkins.io
• issues.jenkins.io (JIRA)

Temporary disruptions (slow requests or outage of a few minutes) on:

• get.jenkins.io (mirror redirector)
• javadoc.jenkins.io
• jenkins-wiki-exporter.jenkins.io
• plugins.jenkins.io
• plugin-health.jenkins.io
• repo.azure.jenkins.io
• reports.jenkins.io
• stories.jenkins.io
• uplink.jenkins.io
• www.jenkins.io

More details in https://github.com/jenkins-infra/helpdesk/issues/4546#issuecomment-2674545933.