villebro opened a new pull request, #43:
URL: https://github.com/apache/superset-kubernetes-operator/pull/43
## Summary
Adds a `SupersetMaintenancePage` child CRD that serves a lightweight
maintenance page while lifecycle tasks (clone/migrate/init) run and components
are drained. Uses orphan deletion of the SupersetWebServer child CR to preserve
its Service, then patches the selector to route traffic to maintenance pods —
giving instant (~1s) switchover via the endpoints controller.
**Two modes:**
- **Managed** (default): `nginx:alpine` with operator-generated HTML.
Customize via `title`, `message`, or full `body`.
- **Custom**: user provides their own image/command. Content fields passed
as `SUPERSET_OPERATOR__MAINTENANCE_*` env vars.
Opt-in via presence on the lifecycle spec:
```yaml
spec:
lifecycle:
maintenancePage: {}
```
**Design: Orphan Deletion**
The operator uses `propagationPolicy: Orphan` when deleting the web-server
child CR during drain. This preserves the Service as an unowned resource, which
the operator patches to route to maintenance pods. After lifecycle completes,
the child reconciler naturally re-adopts the Service via `CreateOrUpdate` +
`SetControllerReference`.
**Alternatives considered and rejected:**
- Owner reference manipulation: non-standard, fragile coupling with GC timing
- Separate Service + Ingress/HTTPRoute backend swap: propagation latency
varies by controller (1s to 3min for cloud LBs), creating an error window;
doesn't work without networking
- Parent-owned stable Service: breaking change to Service naming for a
single feature
Full rationale documented in `docs/architecture/internals.md`.
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