Title here
Summary here
A Project Capsule addon
Kubernetes changes.
On your schedule.
Plan maintenance, scale workloads, and give your users advance notice.
One cluster-scoped ChangeWindow keeps it together.
Open source · Kubernetes native · Independent of Capsule core
What is Change Windows?
Change Windows helps organizations plan routine IT maintenance with fewer surprises and less manual coordination. It gives teams advance notice and can prevent conflicting changes while planned work is underway. It can also pause development environments overnight and bring them back in the morning, helping control infrastructure costs. These routines run automatically on your Kubernetes platform, so teams can spend less time coordinating maintenance and more time delivering services.
One resource. A complete window.
See what a ChangeWindow does
Select a YAML block to explore its configuration and open the matching reference.
apiVersion: addons.projectcapsule.dev/v1alpha1
kind: ChangeWindow
metadata:
name: development-nights
spec:
namespaceSelectors:
- matchLabels:
environment: development
schedules:
- name: nights
cron: "0 19 * * 1-5"
timeZone: Europe/Zurich
duration: 12h
targets:
- name: apps
apiVersion: apps/v1
kind: Deployment
selector:
matchLabels:
downscaling: enabled
serviceAccount:
namespace: schedule-action-controller-system
name: change-window-executor
actions:
- name: downscale
targets: [apps]
capture:
replicas:
subresource: scale
path: /spec/replicas
onStart:
apply:
subresource: scale
force: true
template: |
spec:
replicas: 0
onEnd:
apply:
subresource: scale
template: |
spec:
replicas: {{ .captured.replicas }}
admission:
- name: freeze-scaling
targets: [apps]
operations: [UPDATE]
subresources: ["", scale]
when: Active
audience:
include:
- kind: Group
name: developers
matchConditions:
- name: replicas-changed
expression: "object.spec.replicas != oldObject.spec.replicas"
message: "Replica changes are frozen during maintenance."
config:
admission:
warnings:
- name: upcoming
targets: [apps]
operations: [CREATE, UPDATE, DELETE]
subresources: ["", scale]
when: BeforeStart
within: 1h
message: "Maintenance starts at {{ .window.start }}."