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Custom-metrics API
The custom-metrics
API is installed by default when you install Knative Serving, and allows users to configure concurrency based scaling when using the Horizontal Pod Autoscaler (HPA).
IMPORTANT: If you already have an existing
custom-metrics
API implementation in your cluster, you must delete this so that Knative Serving can use the default Knative Serving installation of thecustom-metrics
API. Enabling both implementations can cause issues.If you intend to use an existing
custom-metrics
API implementation in your cluster, you will not be able to use custom metrics or HPA concurrency metrics on that cluster. These features require the Knative Servingcustom-metrics
API implementation.
Checking for existing custom-metrics API implementations
To check if your cluster has an existing custom-metrics
API implementation, use the following command.
kubectl get apiservice | grep v1beta1.custom.metrics.k8s.io
Deleting existing custom-metrics API installations
If you have an existing custom-metrics
API implementation in your cluster, you must delete this using the following command.
kubectl delete apiservice v1beta1.custom.metrics.k8s.io
IMPORTANT: This step is not required for inexperienced users, as it is possible to break consumers of a custom-metrics API by deleting this. Only delete API implementations if you are sure that it is safe to do so.
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