feat!: Remove VerticalPodAutoscaler

BREAKING CHANGE: VPA is now supported only via Custom Resource Metrics

Signed-off-by: Manuel Rüger <manuel@rueg.eu>

README.md

@@ -37,7 +37,6 @@ are deleted they are no longer visible on the `/metrics` endpoint.
   - [Container Image](#container-image)
 - [Metrics Documentation](#metrics-documentation)
   - [Conflict resolution in label names](#conflict-resolution-in-label-names)
-  - [Enabling VerticalPodAutoscalers](#enabling-verticalpodautoscalers)
 - [Kube-state-metrics self metrics](#kube-state-metrics-self-metrics)
 - [Resource recommendation](#resource-recommendation)
 - [Latency](#latency)
@@ -123,13 +122,6 @@ e.g. by standardizing Kubernetes labels using an
 [Admission Webhook](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/)
 that ensures that there are no possible conflicts.
 
-#### Enabling VerticalPodAutoscalers
-
-Please note that the collector for `verticalpodautoscalers` is **disabled** by default; Vertical Pod Autoscaler metrics will not be collected until the collector is enabled. This is because Vertical Pod Autoscalers are managed as custom resources.
-
-If you want to enable this collector,
-the [instructions](./docs/verticalpodautoscaler-metrics.md#Configuration) are located in the [Vertical Pod Autoscaler Metrics](./docs/verticalpodautoscaler-metrics.md) documentation.
-
 ### Kube-state-metrics self metrics
 
 kube-state-metrics exposes its own general process metrics under `--telemetry-host` and `--telemetry-port` (default 8081).

docs/README.md

@@ -70,7 +70,6 @@ See each file for specific documentation about the exposed metrics:
 - [Role Metrics](role-metrics.md)
 - [RoleBinding Metrics](rolebinding-metrics.md)
 - [ServiceAccount Metrics](serviceaccount-metrics.md)
-- [VerticalPodAutoscaler Metrics](verticalpodautoscaler-metrics.md)
 
 ## Join Metrics
 

docs/customresourcestate-metrics.md

@@ -46,7 +46,7 @@ spec:
                         each:
                           type: Gauge
                           ...
-          - --resources=certificatesigningrequests,configmaps,cronjobs,daemonsets,deployments,endpoints,foos,horizontalpodautoscalers,ingresses,jobs,limitranges,mutatingwebhookconfigurations,namespaces,networkpolicies,nodes,persistentvolumeclaims,persistentvolumes,poddisruptionbudgets,pods,replicasets,replicationcontrollers,resourcequotas,secrets,services,statefulsets,storageclasses,validatingwebhookconfigurations,volumeattachments,verticalpodautoscalers
+          - --resources=certificatesigningrequests,configmaps,cronjobs,daemonsets,deployments,endpoints,foos,horizontalpodautoscalers,ingresses,jobs,limitranges,mutatingwebhookconfigurations,namespaces,networkpolicies,nodes,persistentvolumeclaims,persistentvolumes,poddisruptionbudgets,pods,replicasets,replicationcontrollers,resourcequotas,secrets,services,statefulsets,storageclasses,validatingwebhookconfigurations,volumeattachments
 ```
 
 It's also possible to configure kube-state-metrics to run in a `custom-resource-mode` only. In addition to specifying one of `--custom-resource-state-config*` flags, you could set `--custom-resource-state-only` to `true`.
@@ -207,6 +207,45 @@ kube_customresource_ready_count{customresource_group="myteam.io", customresource
 kube_customresource_ready_count{customresource_group="myteam.io", customresource_kind="Foo", customresource_version="v1", active="3",custom_metric="yes",foo="bar",name="foo",bar="baz",qux="quxx",type="type-b"} 4
 ```
 
+#### VerticalPodAutoscaler
+
+In v2.9.0 the `vericalpodautoscalers` resource was removed from the list of default resources. In order to generate metrics for `verticalpodautoscalers`, you can use the following Custom Resource State config:
+
+```yaml
+# Using --resource=verticalpodautoscalers, we get the following output:
+# HELP kube_verticalpodautoscaler_annotations (Deprecated since v2.9.0) Kubernetes annotations converted to Prometheus labels.
+# TYPE kube_verticalpodautoscaler_annotations gauge
+# kube_verticalpodautoscaler_annotations{namespace="default",verticalpodautoscaler="hamster-vpa",target_api_version="apps/v1",target_kind="Deployment",target_name="hamster"} 1
+# A similar result can be achieved by specifying the following in --custom-resource-state-config:
+kind: CustomResourceStateMetrics
+spec:
+  resources:
+    - groupVersionKind:
+        group: autoscaling.k8s.io
+        kind: "VerticalPodAutoscaler"
+        version: "v1"
+      labelsFromPath:
+        verticalpodautoscaler: [metadata, name]
+        namespace: [metadata, namespace]
+        target_api_version: [apiVersion]
+        target_kind: [spec, targetRef, kind]
+        target_name: [spec, targetRef, name]
+      metrics:
+        - name: "annotations"
+          help: "Kubernetes annotations converted to Prometheus labels."
+          each:
+            type: Gauge
+            gauge:
+              path: [metadata, annotations]
+# This will output the following metric:
+# HELP kube_customresource_autoscaling_annotations Kubernetes annotations converted to Prometheus labels.
+# TYPE kube_customresource_autoscaling_annotations gauge
+# kube_customresource_autoscaling_annotations{customresource_group="autoscaling.k8s.io", customresource_kind="VerticalPodAutoscaler", customresource_version="v1", namespace="default",target_api_version="autoscaling.k8s.io/v1",target_kind="Deployment",target_name="hamster",verticalpodautoscaler="hamster-vpa"} 123
+```
+
+The above configuration was tested on [this](https://github.com/kubernetes/autoscaler/blob/master/vertical-pod-autoscaler/examples/hamster.yaml) VPA configuration, with an added annotation (`foo: 123`).
+
+
 ### Metric types
 
 The configuration supports three kind of metrics from the [OpenMetrics specification](https://github.com/OpenObservability/OpenMetrics/blob/main/specification/OpenMetrics.md).

go.mod

@@ -17,7 +17,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/api v0.26.2
 	k8s.io/apimachinery v0.26.2
-	k8s.io/autoscaler/vertical-pod-autoscaler v0.13.0
 	k8s.io/client-go v0.26.2
 	k8s.io/component-base v0.26.2
 	k8s.io/klog/v2 v2.90.1

go.sum

@@ -607,8 +607,6 @@ k8s.io/api v0.26.2 h1:dM3cinp3PGB6asOySalOZxEG4CZ0IAdJsrYZXE/ovGQ=
 k8s.io/api v0.26.2/go.mod h1:1kjMQsFE+QHPfskEcVNgL3+Hp88B80uj0QtSOlj8itU=
 k8s.io/apimachinery v0.26.2 h1:da1u3D5wfR5u2RpLhE/ZtZS2P7QvDgLZTi9wrNZl/tQ=
 k8s.io/apimachinery v0.26.2/go.mod h1:ats7nN1LExKHvJ9TmwootT00Yz05MuYqPXEXaVeOy5I=
-k8s.io/autoscaler/vertical-pod-autoscaler v0.13.0 h1:pH6AsxeBZcyX6KBqcnl7SPIJqbN1d59RrEBuIE6Rq6c=
-k8s.io/autoscaler/vertical-pod-autoscaler v0.13.0/go.mod h1:LraL5kR2xX7jb4VMCG6/tUH4I75uRHlnzC0VWQHcyWk=
 k8s.io/client-go v0.26.2 h1:s1WkVujHX3kTp4Zn4yGNFK+dlDXy1bAAkIl+cFAiuYI=
 k8s.io/client-go v0.26.2/go.mod h1:u5EjOuSyBa09yqqyY7m3abZeovO/7D/WehVVlZ2qcqU=
 k8s.io/component-base v0.26.2 h1:IfWgCGUDzrD6wLLgXEstJKYZKAFS2kO+rBRi0p3LqcI=