Metacontroller
Composite controller framework required by Kubeflow Pipelines.
Component Category
Platform internals / controller framework
Component Description
Metacontroller is a Kubernetes add-on that simplifies writing custom controllers using declarative rules and webhooks. It provides CompositeController and DecoratorController custom resources that let operators define controller behavior without writing Go code. The platform deploys it as raw YAML manifests (no Helm chart), based on upstream tag v4.15.0.
Why It Is Used
In BullSequana AI, Metacontroller is a hard runtime dependency of Kubeflow Pipelines. The kubeflow-pipelines-profile-controller resource shipped by Kubeflow is a DecoratorController. Without the Metacontroller CRDs and pod running, Kubeflow sync fails with a missing CRD error. Metacontroller has no other consumers in the platform.
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Deployment notes
Metacontroller deploys in the proai tier at sync wave 5, before Kubeflow (sync wave 6). It uses the yaml format (raw manifests, no Helm chart) based on upstream tag v4.15.0. A single-replica StatefulSet runs the controller.
Interacts With
Kubeflow, which defines the DecoratorController resources that Metacontroller processes.ArgoCD, which reconciles the raw manifests as part of the proai parent application.