# create the cloud-pvl-admission cert with the correct groups
    echo '{"CN":"cloud-pvl-admission","hosts":[""],"key":{"algo":"rsa","size":2048}}' | "${CFSSL_BIN}" gencert -ca=pki/ca.crt -ca-key=pki/private/ca.key -config=ca-config.json - | "${CFSSLJSON_BIN}" -bare cloud-pvl-admission
    rm -f "cloud-pvl-admission.csr"

    # Make the cloud-pvl-admission server side certificates.

      # W3C Trace Context. Compatible with OpenCensusAgent and Stackdriver Istio
      # configurations.
      'traceparent',
      'tracestate',

      # Cloud trace context. Compatible with OpenCensusAgent and Stackdriver Istio
      # configurations.
      'x-cloud-trace-context',

      # Grpc binary trace context. Compatible with OpenCensusAgent nad
      # Stackdriver Istio configurations.
      'grpc-trace-bin',

- [`k8s.io/apiserver`](https://github.com/kubernetes/apiserver)
- [`k8s.io/cli-runtime`](https://github.com/kubernetes/cli-runtime)
- [`k8s.io/client-go`](https://github.com/kubernetes/client-go)
- [`k8s.io/cloud-provider`](https://github.com/kubernetes/cloud-provider)
- [`k8s.io/cluster-bootstrap`](https://github.com/kubernetes/cluster-bootstrap)
- [`k8s.io/code-generator`](https://github.com/kubernetes/code-generator)

// of the code which knows what plugins are supported and which flags correspond to each plugin.
type VolumeConfiguration struct {
	// enableHostPathProvisioning enables HostPath PV provisioning when running without a
	// cloud provider. This allows testing and development of provisioning features. HostPath
	// provisioning is not supported in any way, won't work in a multi-node cluster, and
	// should not be used for anything other than testing or development.

	k8s.io/apiserver => ./staging/src/k8s.io/apiserver
	k8s.io/cli-runtime => ./staging/src/k8s.io/cli-runtime
	k8s.io/client-go => ./staging/src/k8s.io/client-go
	k8s.io/cloud-provider => ./staging/src/k8s.io/cloud-provider
	k8s.io/cluster-bootstrap => ./staging/src/k8s.io/cluster-bootstrap
	k8s.io/code-generator => ./staging/src/k8s.io/code-generator
	k8s.io/component-base => ./staging/src/k8s.io/component-base

cloud.google.com/go/auth/oauth2adapt v0.2.2 h1:+TTV8aXpjeChS9M+aTtN/TjdQnzJvmzKFt//oWu7HX4=
cloud.google.com/go/auth/oauth2adapt v0.2.2/go.mod h1:wcYjgpZI9+Yu7LyYBg4pqSiaRkfEK3GQcpb7C/uyF1Q=
cloud.google.com/go/compute/metadata v0.3.0 h1:Tz+eQXMEqDIKRsmY3cHTL6FVaynIjX2QxYC4trgAKZc=
cloud.google.com/go/compute/metadata v0.3.0/go.mod h1:zFmK7XCadkQkj6TtorcaGlCW1hT1fIilQDwofLpJ20k=
cloud.google.com/go/iam v1.1.8 h1:r7umDwhj+BQyz0ScZMp4QrGXjSTI3ZINnpgU2nlB/K0=

	fs.BoolVar(&o.VolumeConfiguration.EnableHostPathProvisioning, "enable-hostpath-provisioner", o.VolumeConfiguration.EnableHostPathProvisioning, "Enable HostPath PV provisioning when running without a cloud provider. This allows testing and development of provisioning features.  HostPath provisioning is not supported in any way, won't work in a multi-node cluster, and should not be used for anything other than testing or development.")

        # configurations.
        'traceparent',
        'tracestate',

        # Cloud trace context. Compatible with OpenCensusAgent and Stackdriver Istio
        # configurations.
        'x-cloud-trace-context',

        # Grpc binary trace context. Compatible with OpenCensusAgent nad
        # Stackdriver Istio configurations.
        'grpc-trace-bin',

	// external refers to a global metric that is not associated
	// with any Kubernetes object. It allows autoscaling based on information
	// coming from components running outside of cluster
	// (for example length of queue in cloud messaging service, or
	// QPS from loadbalancer running outside of cluster).
	// +optional
	External *ExternalMetricSource `json:"external,omitempty" protobuf:"bytes,5,opt,name=external"`
}

	// with any Kubernetes object. It allows autoscaling based on information
	// coming from components running outside of cluster
	// (for example length of queue in cloud messaging service, or
	// QPS from loadbalancer running outside of cluster).
	ExternalMetricSourceType MetricSourceType = "External"
)

// MetricSpec specifies how to scale based on a single metric