Scheduled Maintenance Date:

Thursday, July 23, 2026

Time:

9:00 – (all day)

Affected Service:

Kubernetes Service (including the Workspace feature)

Affected Sites:

SR1, IK1, YH1, IZ1

• AW1 is not covered by this maintenance. Affected users at this site will be contacted individually.

Impact:

As with cluster upgrades, compute nodes will be rebooted sequentially (up to 25% at a time) rather than all at once.

• Compute nodes will be rebooted to apply the kernel update. Applications (Pods) running on Kubernetes and Workspace execution environments will be temporarily stopped, deleted, and recreated.
• Pods created directly without a higher-level resource such as a Deployment or Job will not be recreated automatically.
• Data stored in persistent storage (PVCs, etc.) is not affected. However, data not in persistent storage — including data inside Pods and Workspace execution environments — will be lost.
• Reserved nodes allocated to users will be temporarily unavailable while they are being rebooted.
  • If you have fewer than 4 reserved nodes, they will be rebooted one at a time. If you have 4 or more, up to 25% (rounded down) will be temporarily unavailable at a time.
  • If you have only 1 reserved node, it will be temporarily unavailable.
• Up to 25% (rounded down) of shared nodes will be temporarily unavailable.

Reason:

To update compute nodes to a Linux kernel version that includes a fix for the discovered vulnerability.

Action requested of users:

• If you use Kubernetes services or the Workspace feature, save any necessary data to persistent storage before maintenance begins.
• If you need to preserve in-progress computation state, complete checkpointing before maintenance starts.
• If you have created Pods directly without a higher-level resource such as a Deployment or Job, those Pods will not be recreated automatically. Please review your configuration in advance.

This maintenance is an emergency maintenance conducted in response to a critical security vulnerability. For our maintenance policy, see the User Guide.

Scheduled Maintenance Date:

Monday, August 3, 2026

Network Equipment Maintenance

Time:

9:00 – 11:00

Affected Service:

Kubernetes Service

Affected Sites:

All sites

Impact:

Network connectivity may be temporarily unstable, or Pod creation may be temporarily unstable.

Reason:

Network component version upgrade.

Storage Equipment Maintenance

Time:

9:00 – 18:00

Affected Service:

Kubernetes Service (Persistent Storage)

Affected Sites:

SR1, YH1

Impact:

Response times may be slightly delayed during the maintenance window.

Reason:

Storage appliance OS update.

For our maintenance policy, see the User Guide.

Scheduled Maintenance Date:

Monday, July 6, 2026

Time:

9:00 – 10:00

Affected Service:

Kubernetes Service

Affected Sites:

IK1

Impact:

Network connectivity may be temporarily unstable, or Pod creation may be temporarily unstable.

Reason:

Network component version upgrade.

For our maintenance policy, see the User Guide.

Scheduled Maintenance Date:

Monday, June 15, 2026

Time:

9:00 – 11:00

Affected Service:

Kubernetes Service

Affected Sites:

All sites

Impact:

Network connectivity for Kubernetes nodes may be temporarily interrupted or unstable.

Reason:

Configuration changes required by Cilium API changes.

For our maintenance policy, see the User Guide.

The Kubernetes version has been updated from v1.34.3 to v1.35.3. For details on what changed, see the Kubernetes official release blog entry.

The updated software versions are as follows.

Clusters and Add-ons

Monitoring Service

• Software Versions - Preferred Computing Platform (PFCP) User Guide

PFCP performs regular software version upgrades to improve the stability, performance, and security of Kubernetes and other components. For details, see the PFCP User Guide / Maintenance Policy.

Scheduled Date:

Monday, June 15, 2026

Planned Work:

Details of the work to be performed will be announced at least two weeks before the maintenance date, in accordance with our regular maintenance policy.

Note:

The regular scheduled maintenance date is the first Monday of each month. This announcement is being made because the date differs from the usual schedule. No further notice will be sent if the date remains unchanged.

For our maintenance policy, see the User Guide.

This incident was resolved at approximately 10:30 on April 28, 2026.

Time of Occurrence:

Approximately 10:22 on April 28, 2026

Time of Resolution:

Approximately 10:30 on April 28, 2026

Affected Services:

• PFCP Portal
• Kubernetes Service
  • Kubernetes cluster (internet access only)
  • WebApp Identity-Aware Proxy (Ingress)
  • API Identity-Aware Proxy (API IAP)
• Monitoring Service
  • Grafana

Affected Sites:

All sites

Impact:

Access or connections to the above services were failing.

Workloads running on site clusters were not directly affected.

Cause:

An operational error during maintenance work caused part of the systems responsible for PFCP’s network relaying to stop.

Scheduled Maintenance Date:

Monday, May 18, 2026

Time:

9:00 – 18:00

Affected Sites:

SR1, IK1, YH1, AW1, IZ1 (all PFCP sites)

Planned Maintenance:

1. Kubernetes cluster upgrade: Running applications and Workspace execution environments will be stopped and recreated.
2. Flux version update: Deprecated Flux APIs will be removed and will no longer be available.
3. Database maintenance: The PFCP portal and Grafana will be temporarily unavailable, and the authentication system’s user group propagation will be paused.

Action requested of users:

• If you use Kubernetes services or Workspace, save any necessary data to persistent storage before maintenance begins.
• If you need to preserve in-progress computation state, complete checkpointing before maintenance starts.
• If you have created Pods directly without a higher-level resource such as a Deployment or Job, those Pods will not be recreated automatically. Please review your configuration in advance.
• If you use deprecated Flux APIs, please check whether you will be affected in advance.
• After maintenance, if expected groups are not reflected, please log in again.

1. Kubernetes Cluster Upgrade

Affected Service:

Kubernetes Service (including Workspace)

Reason:

To upgrade the Kubernetes clusters at all PFCP sites from version 1.34 to 1.35.

Impact (workloads):

• All nodes in the Kubernetes cluster will be upgraded sequentially. Applications (Pods) running on Kubernetes and Workspace execution environments will be temporarily stopped, deleted, and recreated.
• Pods created directly without a higher-level resource such as a Deployment or Job will not be recreated automatically.
• Data stored in persistent storage (PVCs, etc.) is not affected. However, data not in persistent storage — including data inside Pods and Workspace execution environments — will be lost.
• In-memory data and in-progress computation state will not be preserved.
• The Kubernetes API may be temporarily unstable during maintenance, causing kubectl operations and Workspace use to fail.

Impact (compute nodes):

• Up to 25% (rounded down) of shared nodes will be temporarily unavailable.
• Dedicated Kubernetes nodes allocated to users will also be upgraded sequentially; each node will be temporarily unavailable during its upgrade.
• If you have fewer than 4 dedicated nodes, they will be upgraded one at a time.
• If you have 4 or more dedicated nodes, up to 25% (rounded down) will be temporarily unavailable at a time.
• If you have only 1 dedicated node, it will be temporarily unavailable.

2. Flux Version Update

Affected Service:

Kubernetes Service

Reason:

To update the Flux version.

Impact:

• Deprecated Flux APIs will be removed and will no longer be available.
• For the list of affected APIs, see https://github.com/fluxcd/flux2/discussions/5572.

3. Database Maintenance

Affected Service:

PFCP Portal, Grafana, authentication system (user group propagation)

Reason:

Database maintenance.

Impact:

• The PFCP portal and Grafana will be temporarily unavailable.
• The authentication system’s user group propagation will be paused during maintenance.
• Login will still be possible, but expected groups may not be reflected.

For our maintenance policy, see the User Guide.

Scheduled Date:

May 18, 2026

Planned Work:

Kubernetes cluster upgrades are planned for all clusters at all sites. PFCP performs regular Kubernetes minor version upgrades to improve cluster stability, performance, and security.

Details of any additional work will be announced at least two weeks before the maintenance date, in accordance with our regular maintenance policy.

Note:

The regular scheduled maintenance date is the first Monday of each month. This announcement is being made because the date differs from the usual schedule. No further notice will be sent if the date remains unchanged.

For our maintenance policy, see the User Guide.

Start Time:

Around 2026/01/26 16:25

Resolution Time:

Around 2026/01/27 09:30

Affected Service:

Workspace feature of the Kubernetes service

Affected Sites:

All sites

Impact:

Workspaces created before the incident were stuck in “Preparing” status and could not be accessed.

Reason:

A defect in the Workspace feature

Date/Time:

Ongoing since around 2026/01/26 16:25

Affected Service:

Workspace feature of the Kubernetes service

Affected Sites:

All sites

Impact:

Workspaces created before the incident are stuck in “Preparing” status and cannot be accessed.

Reason:

A defect in the Workspace feature

Kubernetes has been upgraded to version 1.34. For details, see the official Kubernetes release blog post.

The software versions currently provided are as follows.

Cluster and Add-ons

Monitoring Service

• Software Versions - Preferred Computing Platform (PFCP) User Guide

PFCP performs regular version upgrades, including Kubernetes, to improve software stability, performance, and security. For details, see the PFCP User Guide / Maintenance Policy.

Scheduled Maintenance Date:

Monday, February 2, 2026

Time Window:

9:00-18:00

Affected Service:

Kubernetes Service (Persistent Storage)

Affected Site:

SR1

Reason:

• OS update for storage appliances

Impact:

• During the work window, response speed may experience slight delays.

For our maintenance policy, see the User Guide.

As a result, the following deprecated Flux API versions will no longer be available.

• source.toolkit.fluxcd.io/v1beta1
• source.toolkit.fluxcd.io/v1beta2
• kustomize.toolkit.fluxcd.io/v1beta1
• kustomize.toolkit.fluxcd.io/v1beta2
• helm.toolkit.fluxcd.io/v2beta1
• helm.toolkit.fluxcd.io/v2beta2
• image.toolkit.fluxcd.io/v1beta1
• notification.toolkit.fluxcd.io/v1beta1
• notification.toolkit.fluxcd.io/v1beta2

If you are using any of the APIs above, please migrate to the latest API versions. For details, see https://github.com/fluxcd/flux2/discussions/5572.

Scheduled Maintenance Date:

May 2026

Affected Service:

Kubernetes Service (Flux)

Affected Sites:

All sites

Impact:

• Deprecated Flux API versions will no longer be available.

For our maintenance policy, see the User Guide.

Scheduled Maintenance Date:

Monday, January 19, 2026

Time Window:

9:00-15:00

Affected Service:

Kubernetes Service

Affected Sites:

All sites

Reason:

• Upgrades for all Kubernetes clusters at all sites (from version 1.33 to 1.34)

Impact:

• The Kubernetes API may become temporarily unstable.
• Some user-allocated dedicated Kubernetes nodes may be temporarily unavailable during the upgrade.
  • If you have fewer than 4 contracted nodes, 1 node at a time may be unavailable.
  • If you have 4 or more contracted nodes, up to 25% (rounded down) may be unavailable.
  • If you have only 1 contracted node, no nodes will be available temporarily.

For our maintenance policy, see the User Guide.

Scheduled Date:

January 19, 2026

Planned Work:

We plan to upgrade all Kubernetes clusters at all sites. PFCP performs regular Kubernetes minor version upgrades to improve cluster stability, performance, and security.

Any additional maintenance items will be announced separately by two weeks before the maintenance date, in accordance with our regular maintenance policy.

Notes:

The regular scheduled maintenance date is the first Monday of each month. We are announcing this because the date differs from the usual schedule. If there is no date change, no schedule notice will be issued.

For our maintenance policy, see the User Guide.

Scheduled Date:

November 10, 2025

Planned Work:

Details will be announced separately by two weeks before the maintenance date, in accordance with our regular maintenance policy.

Notes:

The regular scheduled maintenance date is the first Monday of each month. We are announcing this because the date differs from the usual schedule. If there is no date change, no schedule notice will be issued.

For our maintenance policy, see the User Guide.

Kubernetes has been upgraded to version 1.33. For details, see the official Kubernetes release blog post.

The software versions currently provided are as follows.

Cluster and Add-ons

Monitoring Service

• Software Versions - Preferred Computing Platform (PFCP) User Guide

PFCP performs regular version upgrades, including Kubernetes, to improve software stability, performance, and security. For details, see the PFCP User Guide / Maintenance Policy.

Scheduled Maintenance Date:

Monday, September 8, 2025

Time Window:

9:00-15:00

Affected Service:

Kubernetes Service

Affected Sites:

All sites

Reason:

• Upgrades for all Kubernetes clusters at all sites (from version 1.32 to 1.33)

Impact:

• The Kubernetes API may become temporarily unstable.
• Some user-allocated dedicated Kubernetes nodes may be temporarily unavailable during the upgrade.
  • If you have fewer than 4 contracted nodes, 1 node at a time may be unavailable.
  • If you have 4 or more contracted nodes, up to 25% (rounded down) may be unavailable.
  • If you have only 1 contracted node, no nodes will be available temporarily.

Time:

9:00

Affected Service:

Kubernetes Service

Affected Sites:

All sites

Reason:

End of support for the deprecated experimenal-shared PriorityClass

Impact:

• New Pod creation using the experimenal-shared PriorityClass will fail.
• Please migrate to the already available shared-standard PriorityClass.
• For information on using shared nodes, see the User Guide.

For our maintenance policy, see the User Guide.

Scheduled Date:

September 8, 2025

Planned Work:

We plan to upgrade Kubernetes clusters at all sites. PFCP performs regular minor version upgrades to improve cluster stability, performance, and security.

Any additional maintenance items will be announced separately by two weeks before the maintenance date, in accordance with our regular maintenance policy.

Notes:

The regular scheduled maintenance date is the first Monday of each month. We are announcing this because the date differs from the usual schedule. If there is no date change, no schedule notice will be issued.

For our maintenance policy, see the User Guide.

Kubernetes has been upgraded to version 1.32. For details, see the official Kubernetes release blog post.

The software versions currently provided are as follows.

Cluster and Add-ons

Monitoring Service

• Software Versions - Preferred Computing Platform (PFCP) User Guide

PFCP performs regular version upgrades, including Kubernetes, to improve software stability, performance, and security. For details, see the PFCP User Guide / Maintenance Policy.

Scheduled Maintenance Date:

Monday, June 9, 2025

Time Window:

9:00-15:00

Affected Service:

Kubernetes Service

Affected Sites:

SR1, IK1

Reason:

Upgrades for all Kubernetes clusters at all sites (from version 1.31 to 1.32)

Impact:

• The Kubernetes API may become temporarily unstable.
• Some user-allocated dedicated Kubernetes nodes may be temporarily unavailable during the upgrade.
  • If you have fewer than 4 contracted nodes, 1 node at a time may be unavailable.
  • If you have 4 or more contracted nodes, up to 25% (rounded down) may be unavailable.
  • If you have only 1 contracted node, no nodes will be available temporarily.

Time Window:

9:00-13:00

Affected Service:

Monitoring Service

Affected Sites:

All sites

Reason:

Database maintenance work.

Impact:

Grafana will be temporarily unavailable during maintenance.

For our maintenance policy, see the User Guide.