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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-metricsAPI implementation in your cluster, you must delete this so that Knative Serving can use the default Knative Serving installation of the
custom-metricsAPI. Enabling both implementations can cause issues.
If you intend to use an existing
custom-metricsAPI 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 Serving
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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