feat: Route workloads to city locations via distributed scheduling#107
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Workloads targeting a city location are now automatically routed to the correct physical site via a Karmada-based federation layer. Each POP cell operates independently, instance health is surfaced back to the control plane in real time, and the platform remains available even when parts of the control plane are temporarily unreachable. Controllers added: - WorkloadDeploymentFederator: replicates WDs into Karmada and manages PropagationPolicies per city code - InstanceProjector: mirrors Instance write-backs from Karmada into the project namespace on the control plane ResourceInterpreterCustomization deployed at config time teaches Karmada how to aggregate replica counts and conditions across POP cells. Operator flags --enable-management-controllers and --enable-cell-controllers allow each deployment to opt into only the controllers it needs. Includes a 6-test Chainsaw e2e suite covering federation, deletion cascade, propagation policy lifecycle, instance projection, instance write-back, and the full end-to-end chain. Resolves #85 Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Workloads targeting a city location are now automatically routed to the correct physical site, and their status is surfaced back to the platform in real time. Previously, a single central scheduler made all placement decisions; this distributes that responsibility across regional clusters so each site can operate independently.
When you deploy a workload to a city, the platform now routes it to the right physical site based on the city code, reports instance health and readiness back without any manual steps, and continues operating even if other parts of the control plane are temporarily unreachable.
Nothing changes for users — city-code targeting, instance visibility, and the existing API all work exactly as before.
Design: #106
Test plan
Closes #85