Jenkins incident
[publick8s cluster] Azure outage (Update Center, get.jenkins.io, etc.)
Resolved after under a minute, on June 16, 2026.
Starting on Tuesday 16 June 2026 at 07:30am UTC, the cluster publick8s hosting our public web services such as updates.jenkins.io, get.jenkins.io, LDAP and many others started to drop incoming TCP connections.
Update timeline
- investigating Jun 16, 2026, 07:20 AM UTC
The cluster and all its services were up and running at 10:02am UTC after many mitigation and operations from the Jenkins Infra team.
- investigating Jun 16, 2026, 07:20 AM UTC
At 08:50am UTC, all services were down due to internal AKS outage (combination of network issue and Azure forbidding us to spin up new VMs).
- investigating Jun 16, 2026, 07:20 AM UTC
We tried to apply mitigations between 08:15am UTC and 08:45am UTC without any success (draining AKS nodes to restart services on fresh VMs).
- investigating Jun 16, 2026, 07:20 AM UTC
Starting on Tuesday 16 June 2026 at 07:30am UTC, the cluster publick8s hosting our public web services such as updates.jenkins.io, get.jenkins.io, LDAP and many others started to drop incoming TCP connections.
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