CAST AI incident
Intermittent Azure AKS Node Provisioning Failures in Select Regions
CAST AI experienced a minor incident on June 4, 2026 affecting EU Node Autoscaler and Node Autoscaler, lasting 18h 25m. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- identified Jun 04, 2026, 12:17 PM UTC
Status: Identified We are investigating an issue affecting a small number of Azure AKS clusters where node provisioning can fail. Current impact: • New node provisioning ("Add Node") may fail on affected Azure AKS clusters. • Existing workloads and running nodes are not impacted. • We are working on a permanent fix and monitoring all AKS clusters for further occurrences. We will provide updates as more information becomes available. Affected components EU Node Autoscaler (Degraded performance) Node Autoscaler (Degraded performance)
- monitoring Jun 04, 2026, 04:47 PM UTC
Status: Monitoring We continue to investigate intermittent Azure AKS node provisioning failures affecting a limited number of clusters in select regions. A mitigation has been applied to all currently affected clusters, and no additional customer clusters have been observed experiencing the issue at this time. We have identified the cause and are actively testing additional fixes to ensure compatibility with recent changes introduced by Azure's node bootstrap process. Our team is closely monitoring for any new occurrences and will provide further updates as progress continues. Affected components EU Node Autoscaler (Degraded performance) Node Autoscaler (Degraded performance)
- monitoring Jun 04, 2026, 07:40 PM UTC
Status: Monitoring Azure AKS node provisioning is currently operating normally. We will continue monitoring closely. Affected components Node Autoscaler (Operational) EU Node Autoscaler (Operational)
- resolved Jun 05, 2026, 06:42 AM UTC
Status: Resolved A fix has been deployed to restore compatibility with recent Azure AKS node bootstrap changes. We have not observed any additional affected customer clusters, and node provisioning is operating normally. If you experience any issues with node provisioning, please contact our Support team for assistance. Affected components EU Node Autoscaler (Operational) Node Autoscaler (Operational)