Basic CRD for scheduled scaling

Signed-off-by: Arjun Naik <arjun.rn@gmail.com>

.github/CODEOWNERS

@@ -0,0 +1,35 @@
+# These owners will be the default owners for everything in
+# the repo. 
+*       @arjunrn
+
+
+
+# Samples for assigning codeowners below:
+# Order is important; the last matching pattern takes the most
+# precedence. When someone opens a pull request that only
+# modifies JS files, only @js-owner and not the global
+# owner(s) will be requested for a review.
+# *.js    @js-owner
+
+# You can also use email addresses if you prefer. They'll be
+# used to look up users just like we do for commit author
+# emails.
+# *.go docs@example.com
+
+# In this example, @doctocat owns any files in the build/logs
+# directory at the root of the repository and any of its
+# subdirectories.
+# /build/logs/ @doctocat
+
+# The `docs/*` pattern will match files like
+# `docs/getting-started.md` but not further nested files like
+# `docs/build-app/troubleshooting.md`.
+# docs/*  docs@example.com
+
+# In this example, @octocat owns any file in an apps directory
+# anywhere in your repository.
+# apps/ @octocat
+
+# In this example, @doctocat owns any file in the `/docs`
+# directory in the root of your repository.
+# /docs/ @doctocat

.github/dependabot.yml

@@ -1,14 +0,0 @@
-version: 2
-updates:
-- package-ecosystem: gomod
-  directory: "/"
-  schedule:
-    interval: monthly
-    time: "07:00"
-  open-pull-requests-limit: 10
-- package-ecosystem: docker
-  directory: "/"
-  schedule:
-    interval: monthly
-    time: "07:00"
-  open-pull-requests-limit: 10

.travis.yml

@@ -2,7 +2,7 @@ language: go
 dist: xenial
 
 go:
-  - "1.14.x"
+  - "1.13.x"
 
 env:
 - GO111MODULE=on GOLANGCI_RELEASE="v1.21.0"

MAINTAINERS

@@ -1,2 +1,3 @@
 Mikkel Larsen <mikkel.larsen@zalando.de>
+Arjun Naik <arjun.naik@zalando.de>
 Team Teapot <team-teapot@zalando.de>

README.md

@@ -142,7 +142,7 @@ example the following JSON data would be expected:
 ```
 
 The json-path query support depends on the
-[github.com/spyzhov/ajson](https://github.com/spyzhov/ajson) library.
+[github.com/oliveagle/jsonpath](https://github.com/oliveagle/jsonpath) library.
 See the README for possible queries. It's expected that the metric you query
 returns something that can be turned into a `float64`.
 
@@ -166,14 +166,6 @@ will create a URL like this:
 http://<podIP>:9090/metrics?foo=bar&baz=bop
 ```
 
-There are also configuration options for custom (connect and request) timeouts when querying pods for metrics:
-```yaml
-metric-config.pods.requests-per-second.json-path/request-timeout: 2s
-metric-config.pods.requests-per-second.json-path/connect-timeout: 500ms
-```
-
-The default for both of the above values is 15 seconds.
-
 ## Prometheus collector
 
 The Prometheus collector is a generic collector which can map Prometheus
@@ -543,9 +535,9 @@ spec:
               tag-application: my-custom-app
               aggregators: avg # comma separated list of aggregation functions, default: last
               duration: 5m # default: 10m
-      target:
-        averageValue: "30"
-        type: AverageValue
+        target:
+          averageValue: "30"
+          type: AverageValue
 ```
 
 The `check-id` specifies the ZMON check to query for the metrics. `key`
@@ -593,60 +585,3 @@ you need to define a `key` or other `tag` with a "star" query syntax like
 `values.*`. This *hack* is in place because it's not allowed to use `*` in the
 metric label definitions. If both annotations and corresponding label is
 defined, then the annotation takes precedence.
-
-## HTTP Collector
-
-The http collector allows collecting metrics from an external endpoint specified in the HPA.
-Currently only `json-path` collection is supported.
-
-### Supported metrics
-
-| Metric | Description | Type | K8s Versions |
-| ------------ | -------------- | ------- | -- |
-| *custom* | No predefined metrics. Metrics are generated from user defined queries. | Pods | `>=1.12` |
-
-### Example
-
-This is an example of using the HTTP collector to collect metrics from a json
-metrics endpoint specified in the annotations.
-
-```yaml
-apiVersion: autoscaling/v2beta2
-kind: HorizontalPodAutoscaler
-metadata:
-  name: myapp-hpa
-  annotations:
-    # metric-config.<metricType>.<metricName>.<collectorName>/<configKey>
-    metric-config.external.http.json/json-key: "$.some-metric.value"
-    metric-config.external.http.json/endpoint: "http://metric-source.app-namespace:8080/metrics"
-    metric-config.external.http.json/aggregator: "max"
-spec:
-  scaleTargetRef:
-    apiVersion: apps/v1
-    kind: Deployment
-    name: myapp
-  minReplicas: 1
-  maxReplicas: 10
-  metrics:
-  - type: External
-    external:
-      metric:
-        name: http
-        selector:
-          matchLabels:
-            identifier: unique-metric-name
-      target:
-        averageValue: 1
-        type: AverageValue
-```
-
-The HTTP collector similar to the Pod Metrics collector. The metric name should always be `http`.
-This value is also used in the annotations to configure the metrics adapter to query the required
-target. The following configuration values are supported:
-
-- `json-key` to specify the JSON path of the metric to be queried
-- `endpoint` the fully formed path to query for the metric. In the above example a Kubernetes _Service_
-    in the namespace `app-namespace` is called.
-- `aggregator` is only required if the metric is an array of values and specifies how the values
-    are aggregated. Currently this option can support the values: `sum`, `max`, `min`, `avg`.
-

go.mod

@@ -2,30 +2,32 @@ module github.com/zalando-incubator/kube-metrics-adapter
 
 require (
 	github.com/NYTimes/gziphandler v1.0.1 // indirect
-	github.com/aws/aws-sdk-go v1.33.5
+	github.com/aws/aws-sdk-go v1.29.4
+	github.com/coreos/go-systemd v0.0.0-20180705093442-88bfeed483d3 // indirect
+	github.com/golang/groupcache v0.0.0-20180513044358-24b0969c4cb7 // indirect
 	github.com/googleapis/gnostic v0.2.0 // indirect
-	github.com/influxdata/influxdb-client-go v0.1.5
-	github.com/kubernetes-incubator/custom-metrics-apiserver v0.0.0-20200618121405-54026617ec44
-	github.com/lib/pq v1.2.0 // indirect
-	github.com/mattn/go-colorable v0.1.4 // indirect
-	github.com/onsi/gomega v1.8.1 // indirect
-	github.com/prometheus/client_golang v1.7.1
-	github.com/prometheus/common v0.10.0
-	github.com/sirupsen/logrus v1.6.0
-	github.com/spf13/cobra v0.0.7
-	github.com/spyzhov/ajson v0.4.2
-	github.com/stretchr/testify v1.6.1
+	github.com/grpc-ecosystem/grpc-gateway v1.4.1 // indirect
+	github.com/influxdata/influxdb-client-go v0.1.4
+	github.com/kubernetes-incubator/custom-metrics-apiserver v0.0.0-20190918110929-3d9be26a50eb
+	github.com/oliveagle/jsonpath v0.0.0-20180606110733-2e52cf6e6852
+	github.com/prometheus/client_golang v0.9.2
+	github.com/prometheus/common v0.0.0-20181126121408-4724e9255275
+	github.com/sirupsen/logrus v1.4.2
+	github.com/soheilhy/cmux v0.1.4 // indirect
+	github.com/spf13/cobra v0.0.3
+	github.com/stretchr/testify v1.4.0
+	github.com/tmc/grpc-websocket-proxy v0.0.0-20171017195756-830351dc03c6 // indirect
 	github.com/zalando-incubator/cluster-lifecycle-manager v0.0.0-20180921141935-824b77fb1f84
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
-	golang.org/x/tools v0.0.0-20200204192400-7124308813f3 // indirect
-	gonum.org/v1/netlib v0.0.0-20190331212654-76723241ea4e // indirect
-	honnef.co/go/tools v0.0.1-2020.1.3 // indirect
-	k8s.io/api v0.18.5
-	k8s.io/apimachinery v0.18.5
-	k8s.io/client-go v0.18.5
-	k8s.io/component-base v0.18.5
+	gopkg.in/inf.v0 v0.9.1 // indirect
+	k8s.io/api v0.0.0-20190918155943-95b840bb6a1f
+	k8s.io/apimachinery v0.0.0-20190913080033-27d36303b655
+	k8s.io/apiserver v0.0.0-20190918160949-bfa5e2e684ad // indirect
+	k8s.io/client-go v0.0.0-20190918160344-1fbdaa4c8d90
+	k8s.io/code-generator v0.17.4
+	k8s.io/component-base v0.0.0-20190918160511-547f6c5d7090
 	k8s.io/klog v1.0.0
-	k8s.io/metrics v0.18.5
+	k8s.io/metrics v0.0.0-20190226180357-f3f09b9076d1
 )
 
 go 1.13

hack/boilerplate.go.txt

@@ -0,0 +1,15 @@
+/*
+Copyright YEAR The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/

hack/tools.go

@@ -0,0 +1,5 @@
+package main
+
+import (
+	_ "k8s.io/code-generator"
+)

hack/update-codegen.sh

@@ -0,0 +1,48 @@
+#!/bin/bash
+
+# Copyright 2017 The Kubernetes Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -o errexit
+set -o nounset
+set -o pipefail
+set -x
+SRC="github.com"
+GOPKG="$SRC/zalando-incubator/kube-metrics-adapter"
+CUSTOM_RESOURCE_NAME="zalando.org"
+CUSTOM_RESOURCE_VERSION="v1"
+
+SCRIPT_ROOT="$(dirname ${BASH_SOURCE[0]})/.."
+CODEGEN_PKG=${CODEGEN_PKG:-$(cd "${SCRIPT_ROOT}"; ls -d -1 ./vendor/k8s.io/code-generator 2>/dev/null || echo ../code-generator)}
+OUTPUT_BASE="$(dirname ${BASH_SOURCE})/"
+
+go mod vendor
+
+# generate the code with:
+# --output-base    because this script should also be able to run inside the vendor dir of
+#                  k8s.io/kubernetes. The output-base is needed for the generators to output into the vendor dir
+#                  instead of the $GOPATH directly. For normal projects this can be dropped.
+bash "${CODEGEN_PKG}"/generate-groups.sh all \
+  "${GOPKG}/pkg/client" "${GOPKG}/pkg/apis" \
+  "${CUSTOM_RESOURCE_NAME}:${CUSTOM_RESOURCE_VERSION}" \
+  --go-header-file hack/boilerplate.go.txt \
+  --output-base "$OUTPUT_BASE"
+
+# To use your own boilerplate text append:
+#   --go-header-file ${SCRIPT_ROOT}/hack/custom-boilerplate.go.txt
+
+# hack to make the generated code work with Go module based projects
+cp -r "$OUTPUT_BASE/$GOPKG/pkg/apis" ./pkg
+cp -r "$OUTPUT_BASE/$GOPKG/pkg/client" ./pkg
+rm -rf "${OUTPUT_BASE:?}${SRC}"

pkg/annotations/parser_test.go

@@ -86,21 +86,6 @@ func TestParser(t *testing.T) {
 				"org-id":  "deadbeef",
 			},
 		},
-		{
-			Name: "http metrics",
-			Annotations: map[string]string{
-				"metric-config.external.http.json/json-key":   "$.metric.value",
-				"metric-config.external.http.json/endpoint":   "http://metric-source.source-namespace.svc.cluster.local:8000/metrics",
-				"metric-config.external.http.json/aggregator": "avg",
-			},
-			MetricName: "http",
-			MetricType: autoscalingv2.ExternalMetricSourceType,
-			ExpectedConfig: map[string]string{
-				"json-key":   "$.metric.value",
-				"endpoint":   "http://metric-source.source-namespace.svc.cluster.local:8000/metrics",
-				"aggregator": "avg",
-			},
-		},
 	} {
 		t.Run(tc.Name, func(t *testing.T) {
 			hpaMap := make(AnnotationConfigMap)

pkg/apis/zalando.org/register.go

@@ -0,0 +1,6 @@
+package zalando
+
+const (
+	// GroupName is the group name used in this package.
+	GroupName = "zalando.org"
+)

pkg/apis/zalando.org/v1/types.go

@@ -0,0 +1,17 @@
+package v1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// +genclient
+// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object
+// +kubebuilder:object:root=true
+
+// ScheduledScaling describes an application resource.
+// +k8s:deepcopy-gen=true
+type ScheduledScaling struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+}
+

pkg/apis/zalando.org/v1/zz_generated.deepcopy.go

@@ -0,0 +1,51 @@
+// +build !ignore_autogenerated
+
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by deepcopy-gen. DO NOT EDIT.
+
+package v1
+
+import (
+	runtime "k8s.io/apimachinery/pkg/runtime"
+)
+
+// DeepCopyInto is an autogenerated deepcopy function, copying the receiver, writing into out. in must be non-nil.
+func (in *ScheduledScaling) DeepCopyInto(out *ScheduledScaling) {
+	*out = *in
+	out.TypeMeta = in.TypeMeta
+	in.ObjectMeta.DeepCopyInto(&out.ObjectMeta)
+	return
+}
+
+// DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new ScheduledScaling.
+func (in *ScheduledScaling) DeepCopy() *ScheduledScaling {
+	if in == nil {
+		return nil
+	}
+	out := new(ScheduledScaling)
+	in.DeepCopyInto(out)
+	return out
+}
+
+// DeepCopyObject is an autogenerated deepcopy function, copying the receiver, creating a new runtime.Object.
+func (in *ScheduledScaling) DeepCopyObject() runtime.Object {
+	if c := in.DeepCopy(); c != nil {
+		return c
+	}
+	return nil
+}

pkg/client/clientset/versioned/clientset.go

@@ -0,0 +1,97 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package versioned
+
+import (
+	"fmt"
+
+	zalandov1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned/typed/zalando.org/v1"
+	discovery "k8s.io/client-go/discovery"
+	rest "k8s.io/client-go/rest"
+	flowcontrol "k8s.io/client-go/util/flowcontrol"
+)
+
+type Interface interface {
+	Discovery() discovery.DiscoveryInterface
+	ZalandoV1() zalandov1.ZalandoV1Interface
+}
+
+// Clientset contains the clients for groups. Each group has exactly one
+// version included in a Clientset.
+type Clientset struct {
+	*discovery.DiscoveryClient
+	zalandoV1 *zalandov1.ZalandoV1Client
+}
+
+// ZalandoV1 retrieves the ZalandoV1Client
+func (c *Clientset) ZalandoV1() zalandov1.ZalandoV1Interface {
+	return c.zalandoV1
+}
+
+// Discovery retrieves the DiscoveryClient
+func (c *Clientset) Discovery() discovery.DiscoveryInterface {
+	if c == nil {
+		return nil
+	}
+	return c.DiscoveryClient
+}
+
+// NewForConfig creates a new Clientset for the given config.
+// If config's RateLimiter is not set and QPS and Burst are acceptable,
+// NewForConfig will generate a rate-limiter in configShallowCopy.
+func NewForConfig(c *rest.Config) (*Clientset, error) {
+	configShallowCopy := *c
+	if configShallowCopy.RateLimiter == nil && configShallowCopy.QPS > 0 {
+		if configShallowCopy.Burst <= 0 {
+			return nil, fmt.Errorf("Burst is required to be greater than 0 when RateLimiter is not set and QPS is set to greater than 0")
+		}
+		configShallowCopy.RateLimiter = flowcontrol.NewTokenBucketRateLimiter(configShallowCopy.QPS, configShallowCopy.Burst)
+	}
+	var cs Clientset
+	var err error
+	cs.zalandoV1, err = zalandov1.NewForConfig(&configShallowCopy)
+	if err != nil {
+		return nil, err
+	}
+
+	cs.DiscoveryClient, err = discovery.NewDiscoveryClientForConfig(&configShallowCopy)
+	if err != nil {
+		return nil, err
+	}
+	return &cs, nil
+}
+
+// NewForConfigOrDie creates a new Clientset for the given config and
+// panics if there is an error in the config.
+func NewForConfigOrDie(c *rest.Config) *Clientset {
+	var cs Clientset
+	cs.zalandoV1 = zalandov1.NewForConfigOrDie(c)
+
+	cs.DiscoveryClient = discovery.NewDiscoveryClientForConfigOrDie(c)
+	return &cs
+}
+
+// New creates a new Clientset for the given RESTClient.
+func New(c rest.Interface) *Clientset {
+	var cs Clientset
+	cs.zalandoV1 = zalandov1.New(c)
+
+	cs.DiscoveryClient = discovery.NewDiscoveryClient(c)
+	return &cs
+}

pkg/client/clientset/versioned/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+// This package has the automatically generated clientset.
+package versioned

pkg/client/clientset/versioned/fake/clientset_generated.go

@@ -0,0 +1,82 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package fake
+
+import (
+	clientset "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned"
+	zalandov1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned/typed/zalando.org/v1"
+	fakezalandov1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned/typed/zalando.org/v1/fake"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/watch"
+	"k8s.io/client-go/discovery"
+	fakediscovery "k8s.io/client-go/discovery/fake"
+	"k8s.io/client-go/testing"
+)
+
+// NewSimpleClientset returns a clientset that will respond with the provided objects.
+// It's backed by a very simple object tracker that processes creates, updates and deletions as-is,
+// without applying any validations and/or defaults. It shouldn't be considered a replacement
+// for a real clientset and is mostly useful in simple unit tests.
+func NewSimpleClientset(objects ...runtime.Object) *Clientset {
+	o := testing.NewObjectTracker(scheme, codecs.UniversalDecoder())
+	for _, obj := range objects {
+		if err := o.Add(obj); err != nil {
+			panic(err)
+		}
+	}
+
+	cs := &Clientset{tracker: o}
+	cs.discovery = &fakediscovery.FakeDiscovery{Fake: &cs.Fake}
+	cs.AddReactor("*", "*", testing.ObjectReaction(o))
+	cs.AddWatchReactor("*", func(action testing.Action) (handled bool, ret watch.Interface, err error) {
+		gvr := action.GetResource()
+		ns := action.GetNamespace()
+		watch, err := o.Watch(gvr, ns)
+		if err != nil {
+			return false, nil, err
+		}
+		return true, watch, nil
+	})
+
+	return cs
+}
+
+// Clientset implements clientset.Interface. Meant to be embedded into a
+// struct to get a default implementation. This makes faking out just the method
+// you want to test easier.
+type Clientset struct {
+	testing.Fake
+	discovery *fakediscovery.FakeDiscovery
+	tracker   testing.ObjectTracker
+}
+
+func (c *Clientset) Discovery() discovery.DiscoveryInterface {
+	return c.discovery
+}
+
+func (c *Clientset) Tracker() testing.ObjectTracker {
+	return c.tracker
+}
+
+var _ clientset.Interface = &Clientset{}
+
+// ZalandoV1 retrieves the ZalandoV1Client
+func (c *Clientset) ZalandoV1() zalandov1.ZalandoV1Interface {
+	return &fakezalandov1.FakeZalandoV1{Fake: &c.Fake}
+}

pkg/client/clientset/versioned/fake/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+// This package has the automatically generated fake clientset.
+package fake

pkg/client/clientset/versioned/fake/register.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package fake
+
+import (
+	zalandov1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/apis/zalando.org/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	schema "k8s.io/apimachinery/pkg/runtime/schema"
+	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+)
+
+var scheme = runtime.NewScheme()
+var codecs = serializer.NewCodecFactory(scheme)
+var parameterCodec = runtime.NewParameterCodec(scheme)
+var localSchemeBuilder = runtime.SchemeBuilder{
+	zalandov1.AddToScheme,
+}
+
+// AddToScheme adds all types of this clientset into the given scheme. This allows composition
+// of clientsets, like in:
+//
+//   import (
+//     "k8s.io/client-go/kubernetes"
+//     clientsetscheme "k8s.io/client-go/kubernetes/scheme"
+//     aggregatorclientsetscheme "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset/scheme"
+//   )
+//
+//   kclientset, _ := kubernetes.NewForConfig(c)
+//   _ = aggregatorclientsetscheme.AddToScheme(clientsetscheme.Scheme)
+//
+// After this, RawExtensions in Kubernetes types will serialize kube-aggregator types
+// correctly.
+var AddToScheme = localSchemeBuilder.AddToScheme
+
+func init() {
+	v1.AddToGroupVersion(scheme, schema.GroupVersion{Version: "v1"})
+	utilruntime.Must(AddToScheme(scheme))
+}

pkg/client/clientset/versioned/scheme/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+// This package contains the scheme of the automatically generated clientset.
+package scheme

pkg/client/clientset/versioned/scheme/register.go

@@ -0,0 +1,56 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package scheme
+
+import (
+	zalandov1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/apis/zalando.org/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	schema "k8s.io/apimachinery/pkg/runtime/schema"
+	serializer "k8s.io/apimachinery/pkg/runtime/serializer"
+	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
+)
+
+var Scheme = runtime.NewScheme()
+var Codecs = serializer.NewCodecFactory(Scheme)
+var ParameterCodec = runtime.NewParameterCodec(Scheme)
+var localSchemeBuilder = runtime.SchemeBuilder{
+	zalandov1.AddToScheme,
+}
+
+// AddToScheme adds all types of this clientset into the given scheme. This allows composition
+// of clientsets, like in:
+//
+//   import (
+//     "k8s.io/client-go/kubernetes"
+//     clientsetscheme "k8s.io/client-go/kubernetes/scheme"
+//     aggregatorclientsetscheme "k8s.io/kube-aggregator/pkg/client/clientset_generated/clientset/scheme"
+//   )
+//
+//   kclientset, _ := kubernetes.NewForConfig(c)
+//   _ = aggregatorclientsetscheme.AddToScheme(clientsetscheme.Scheme)
+//
+// After this, RawExtensions in Kubernetes types will serialize kube-aggregator types
+// correctly.
+var AddToScheme = localSchemeBuilder.AddToScheme
+
+func init() {
+	v1.AddToGroupVersion(Scheme, schema.GroupVersion{Version: "v1"})
+	utilruntime.Must(AddToScheme(Scheme))
+}

pkg/client/clientset/versioned/typed/zalando.org/v1/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+// This package has the automatically generated typed clients.
+package v1

pkg/client/clientset/versioned/typed/zalando.org/v1/fake/doc.go

@@ -0,0 +1,20 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+// Package fake has the automatically generated clients.
+package fake

pkg/client/clientset/versioned/typed/zalando.org/v1/fake/fake_scheduledscaling.go

@@ -0,0 +1,128 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package fake
+
+import (
+	zalandoorgv1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/apis/zalando.org/v1"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	labels "k8s.io/apimachinery/pkg/labels"
+	schema "k8s.io/apimachinery/pkg/runtime/schema"
+	types "k8s.io/apimachinery/pkg/types"
+	watch "k8s.io/apimachinery/pkg/watch"
+	testing "k8s.io/client-go/testing"
+)
+
+// FakeScheduledScalings implements ScheduledScalingInterface
+type FakeScheduledScalings struct {
+	Fake *FakeZalandoV1
+	ns   string
+}
+
+var scheduledscalingsResource = schema.GroupVersionResource{Group: "zalando.org", Version: "v1", Resource: "scheduledscalings"}
+
+var scheduledscalingsKind = schema.GroupVersionKind{Group: "zalando.org", Version: "v1", Kind: "ScheduledScaling"}
+
+// Get takes name of the scheduledScaling, and returns the corresponding scheduledScaling object, and an error if there is any.
+func (c *FakeScheduledScalings) Get(name string, options v1.GetOptions) (result *zalandoorgv1.ScheduledScaling, err error) {
+	obj, err := c.Fake.
+		Invokes(testing.NewGetAction(scheduledscalingsResource, c.ns, name), &zalandoorgv1.ScheduledScaling{})
+
+	if obj == nil {
+		return nil, err
+	}
+	return obj.(*zalandoorgv1.ScheduledScaling), err
+}
+
+// List takes label and field selectors, and returns the list of ScheduledScalings that match those selectors.
+func (c *FakeScheduledScalings) List(opts v1.ListOptions) (result *zalandoorgv1.ScheduledScalingList, err error) {
+	obj, err := c.Fake.
+		Invokes(testing.NewListAction(scheduledscalingsResource, scheduledscalingsKind, c.ns, opts), &zalandoorgv1.ScheduledScalingList{})
+
+	if obj == nil {
+		return nil, err
+	}
+
+	label, _, _ := testing.ExtractFromListOptions(opts)
+	if label == nil {
+		label = labels.Everything()
+	}
+	list := &zalandoorgv1.ScheduledScalingList{ListMeta: obj.(*zalandoorgv1.ScheduledScalingList).ListMeta}
+	for _, item := range obj.(*zalandoorgv1.ScheduledScalingList).Items {
+		if label.Matches(labels.Set(item.Labels)) {
+			list.Items = append(list.Items, item)
+		}
+	}
+	return list, err
+}
+
+// Watch returns a watch.Interface that watches the requested scheduledScalings.
+func (c *FakeScheduledScalings) Watch(opts v1.ListOptions) (watch.Interface, error) {
+	return c.Fake.
+		InvokesWatch(testing.NewWatchAction(scheduledscalingsResource, c.ns, opts))
+
+}
+
+// Create takes the representation of a scheduledScaling and creates it.  Returns the server's representation of the scheduledScaling, and an error, if there is any.
+func (c *FakeScheduledScalings) Create(scheduledScaling *zalandoorgv1.ScheduledScaling) (result *zalandoorgv1.ScheduledScaling, err error) {
+	obj, err := c.Fake.
+		Invokes(testing.NewCreateAction(scheduledscalingsResource, c.ns, scheduledScaling), &zalandoorgv1.ScheduledScaling{})
+
+	if obj == nil {
+		return nil, err
+	}
+	return obj.(*zalandoorgv1.ScheduledScaling), err
+}
+
+// Update takes the representation of a scheduledScaling and updates it. Returns the server's representation of the scheduledScaling, and an error, if there is any.
+func (c *FakeScheduledScalings) Update(scheduledScaling *zalandoorgv1.ScheduledScaling) (result *zalandoorgv1.ScheduledScaling, err error) {
+	obj, err := c.Fake.
+		Invokes(testing.NewUpdateAction(scheduledscalingsResource, c.ns, scheduledScaling), &zalandoorgv1.ScheduledScaling{})
+
+	if obj == nil {
+		return nil, err
+	}
+	return obj.(*zalandoorgv1.ScheduledScaling), err
+}
+
+// Delete takes name of the scheduledScaling and deletes it. Returns an error if one occurs.
+func (c *FakeScheduledScalings) Delete(name string, options *v1.DeleteOptions) error {
+	_, err := c.Fake.
+		Invokes(testing.NewDeleteAction(scheduledscalingsResource, c.ns, name), &zalandoorgv1.ScheduledScaling{})
+
+	return err
+}
+
+// DeleteCollection deletes a collection of objects.
+func (c *FakeScheduledScalings) DeleteCollection(options *v1.DeleteOptions, listOptions v1.ListOptions) error {
+	action := testing.NewDeleteCollectionAction(scheduledscalingsResource, c.ns, listOptions)
+
+	_, err := c.Fake.Invokes(action, &zalandoorgv1.ScheduledScalingList{})
+	return err
+}
+
+// Patch applies the patch and returns the patched scheduledScaling.
+func (c *FakeScheduledScalings) Patch(name string, pt types.PatchType, data []byte, subresources ...string) (result *zalandoorgv1.ScheduledScaling, err error) {
+	obj, err := c.Fake.
+		Invokes(testing.NewPatchSubresourceAction(scheduledscalingsResource, c.ns, name, pt, data, subresources...), &zalandoorgv1.ScheduledScaling{})
+
+	if obj == nil {
+		return nil, err
+	}
+	return obj.(*zalandoorgv1.ScheduledScaling), err
+}

pkg/client/clientset/versioned/typed/zalando.org/v1/fake/fake_zalando.org_client.go

@@ -0,0 +1,40 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package fake
+
+import (
+	v1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned/typed/zalando.org/v1"
+	rest "k8s.io/client-go/rest"
+	testing "k8s.io/client-go/testing"
+)
+
+type FakeZalandoV1 struct {
+	*testing.Fake
+}
+
+func (c *FakeZalandoV1) ScheduledScalings(namespace string) v1.ScheduledScalingInterface {
+	return &FakeScheduledScalings{c, namespace}
+}
+
+// RESTClient returns a RESTClient that is used to communicate
+// with API server by this client implementation.
+func (c *FakeZalandoV1) RESTClient() rest.Interface {
+	var ret *rest.RESTClient
+	return ret
+}

pkg/client/clientset/versioned/typed/zalando.org/v1/generated_expansion.go

@@ -0,0 +1,21 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package v1
+
+type ScheduledScalingExpansion interface{}

pkg/client/clientset/versioned/typed/zalando.org/v1/scheduledscaling.go

@@ -0,0 +1,174 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package v1
+
+import (
+	"time"
+
+	v1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/apis/zalando.org/v1"
+	scheme "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned/scheme"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	types "k8s.io/apimachinery/pkg/types"
+	watch "k8s.io/apimachinery/pkg/watch"
+	rest "k8s.io/client-go/rest"
+)
+
+// ScheduledScalingsGetter has a method to return a ScheduledScalingInterface.
+// A group's client should implement this interface.
+type ScheduledScalingsGetter interface {
+	ScheduledScalings(namespace string) ScheduledScalingInterface
+}
+
+// ScheduledScalingInterface has methods to work with ScheduledScaling resources.
+type ScheduledScalingInterface interface {
+	Create(*v1.ScheduledScaling) (*v1.ScheduledScaling, error)
+	Update(*v1.ScheduledScaling) (*v1.ScheduledScaling, error)
+	Delete(name string, options *metav1.DeleteOptions) error
+	DeleteCollection(options *metav1.DeleteOptions, listOptions metav1.ListOptions) error
+	Get(name string, options metav1.GetOptions) (*v1.ScheduledScaling, error)
+	List(opts metav1.ListOptions) (*v1.ScheduledScalingList, error)
+	Watch(opts metav1.ListOptions) (watch.Interface, error)
+	Patch(name string, pt types.PatchType, data []byte, subresources ...string) (result *v1.ScheduledScaling, err error)
+	ScheduledScalingExpansion
+}
+
+// scheduledScalings implements ScheduledScalingInterface
+type scheduledScalings struct {
+	client rest.Interface
+	ns     string
+}
+
+// newScheduledScalings returns a ScheduledScalings
+func newScheduledScalings(c *ZalandoV1Client, namespace string) *scheduledScalings {
+	return &scheduledScalings{
+		client: c.RESTClient(),
+		ns:     namespace,
+	}
+}
+
+// Get takes name of the scheduledScaling, and returns the corresponding scheduledScaling object, and an error if there is any.
+func (c *scheduledScalings) Get(name string, options metav1.GetOptions) (result *v1.ScheduledScaling, err error) {
+	result = &v1.ScheduledScaling{}
+	err = c.client.Get().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		Name(name).
+		VersionedParams(&options, scheme.ParameterCodec).
+		Do().
+		Into(result)
+	return
+}
+
+// List takes label and field selectors, and returns the list of ScheduledScalings that match those selectors.
+func (c *scheduledScalings) List(opts metav1.ListOptions) (result *v1.ScheduledScalingList, err error) {
+	var timeout time.Duration
+	if opts.TimeoutSeconds != nil {
+		timeout = time.Duration(*opts.TimeoutSeconds) * time.Second
+	}
+	result = &v1.ScheduledScalingList{}
+	err = c.client.Get().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		VersionedParams(&opts, scheme.ParameterCodec).
+		Timeout(timeout).
+		Do().
+		Into(result)
+	return
+}
+
+// Watch returns a watch.Interface that watches the requested scheduledScalings.
+func (c *scheduledScalings) Watch(opts metav1.ListOptions) (watch.Interface, error) {
+	var timeout time.Duration
+	if opts.TimeoutSeconds != nil {
+		timeout = time.Duration(*opts.TimeoutSeconds) * time.Second
+	}
+	opts.Watch = true
+	return c.client.Get().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		VersionedParams(&opts, scheme.ParameterCodec).
+		Timeout(timeout).
+		Watch()
+}
+
+// Create takes the representation of a scheduledScaling and creates it.  Returns the server's representation of the scheduledScaling, and an error, if there is any.
+func (c *scheduledScalings) Create(scheduledScaling *v1.ScheduledScaling) (result *v1.ScheduledScaling, err error) {
+	result = &v1.ScheduledScaling{}
+	err = c.client.Post().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		Body(scheduledScaling).
+		Do().
+		Into(result)
+	return
+}
+
+// Update takes the representation of a scheduledScaling and updates it. Returns the server's representation of the scheduledScaling, and an error, if there is any.
+func (c *scheduledScalings) Update(scheduledScaling *v1.ScheduledScaling) (result *v1.ScheduledScaling, err error) {
+	result = &v1.ScheduledScaling{}
+	err = c.client.Put().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		Name(scheduledScaling.Name).
+		Body(scheduledScaling).
+		Do().
+		Into(result)
+	return
+}
+
+// Delete takes name of the scheduledScaling and deletes it. Returns an error if one occurs.
+func (c *scheduledScalings) Delete(name string, options *metav1.DeleteOptions) error {
+	return c.client.Delete().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		Name(name).
+		Body(options).
+		Do().
+		Error()
+}
+
+// DeleteCollection deletes a collection of objects.
+func (c *scheduledScalings) DeleteCollection(options *metav1.DeleteOptions, listOptions metav1.ListOptions) error {
+	var timeout time.Duration
+	if listOptions.TimeoutSeconds != nil {
+		timeout = time.Duration(*listOptions.TimeoutSeconds) * time.Second
+	}
+	return c.client.Delete().
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		VersionedParams(&listOptions, scheme.ParameterCodec).
+		Timeout(timeout).
+		Body(options).
+		Do().
+		Error()
+}
+
+// Patch applies the patch and returns the patched scheduledScaling.
+func (c *scheduledScalings) Patch(name string, pt types.PatchType, data []byte, subresources ...string) (result *v1.ScheduledScaling, err error) {
+	result = &v1.ScheduledScaling{}
+	err = c.client.Patch(pt).
+		Namespace(c.ns).
+		Resource("scheduledscalings").
+		SubResource(subresources...).
+		Name(name).
+		Body(data).
+		Do().
+		Into(result)
+	return
+}

pkg/client/clientset/versioned/typed/zalando.org/v1/zalando.org_client.go

@@ -0,0 +1,89 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by client-gen. DO NOT EDIT.
+
+package v1
+
+import (
+	v1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/apis/zalando.org/v1"
+	"github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned/scheme"
+	rest "k8s.io/client-go/rest"
+)
+
+type ZalandoV1Interface interface {
+	RESTClient() rest.Interface
+	ScheduledScalingsGetter
+}
+
+// ZalandoV1Client is used to interact with features provided by the zalando.org group.
+type ZalandoV1Client struct {
+	restClient rest.Interface
+}
+
+func (c *ZalandoV1Client) ScheduledScalings(namespace string) ScheduledScalingInterface {
+	return newScheduledScalings(c, namespace)
+}
+
+// NewForConfig creates a new ZalandoV1Client for the given config.
+func NewForConfig(c *rest.Config) (*ZalandoV1Client, error) {
+	config := *c
+	if err := setConfigDefaults(&config); err != nil {
+		return nil, err
+	}
+	client, err := rest.RESTClientFor(&config)
+	if err != nil {
+		return nil, err
+	}
+	return &ZalandoV1Client{client}, nil
+}
+
+// NewForConfigOrDie creates a new ZalandoV1Client for the given config and
+// panics if there is an error in the config.
+func NewForConfigOrDie(c *rest.Config) *ZalandoV1Client {
+	client, err := NewForConfig(c)
+	if err != nil {
+		panic(err)
+	}
+	return client
+}
+
+// New creates a new ZalandoV1Client for the given RESTClient.
+func New(c rest.Interface) *ZalandoV1Client {
+	return &ZalandoV1Client{c}
+}
+
+func setConfigDefaults(config *rest.Config) error {
+	gv := v1.SchemeGroupVersion
+	config.GroupVersion = &gv
+	config.APIPath = "/apis"
+	config.NegotiatedSerializer = scheme.Codecs.WithoutConversion()
+
+	if config.UserAgent == "" {
+		config.UserAgent = rest.DefaultKubernetesUserAgent()
+	}
+
+	return nil
+}
+
+// RESTClient returns a RESTClient that is used to communicate
+// with API server by this client implementation.
+func (c *ZalandoV1Client) RESTClient() rest.Interface {
+	if c == nil {
+		return nil
+	}
+	return c.restClient
+}

pkg/client/informers/externalversions/factory.go

@@ -0,0 +1,180 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by informer-gen. DO NOT EDIT.
+
+package externalversions
+
+import (
+	reflect "reflect"
+	sync "sync"
+	time "time"
+
+	versioned "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/clientset/versioned"
+	internalinterfaces "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/informers/externalversions/internalinterfaces"
+	zalandoorg "github.com/zalando-incubator/kube-metrics-adapter/pkg/client/informers/externalversions/zalando.org"
+	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	runtime "k8s.io/apimachinery/pkg/runtime"
+	schema "k8s.io/apimachinery/pkg/runtime/schema"
+	cache "k8s.io/client-go/tools/cache"
+)
+
+// SharedInformerOption defines the functional option type for SharedInformerFactory.
+type SharedInformerOption func(*sharedInformerFactory) *sharedInformerFactory
+
+type sharedInformerFactory struct {
+	client           versioned.Interface
+	namespace        string
+	tweakListOptions internalinterfaces.TweakListOptionsFunc
+	lock             sync.Mutex
+	defaultResync    time.Duration
+	customResync     map[reflect.Type]time.Duration
+
+	informers map[reflect.Type]cache.SharedIndexInformer
+	// startedInformers is used for tracking which informers have been started.
+	// This allows Start() to be called multiple times safely.
+	startedInformers map[reflect.Type]bool
+}
+
+// WithCustomResyncConfig sets a custom resync period for the specified informer types.
+func WithCustomResyncConfig(resyncConfig map[v1.Object]time.Duration) SharedInformerOption {
+	return func(factory *sharedInformerFactory) *sharedInformerFactory {
+		for k, v := range resyncConfig {
+			factory.customResync[reflect.TypeOf(k)] = v
+		}
+		return factory
+	}
+}
+
+// WithTweakListOptions sets a custom filter on all listers of the configured SharedInformerFactory.
+func WithTweakListOptions(tweakListOptions internalinterfaces.TweakListOptionsFunc) SharedInformerOption {
+	return func(factory *sharedInformerFactory) *sharedInformerFactory {
+		factory.tweakListOptions = tweakListOptions
+		return factory
+	}
+}
+
+// WithNamespace limits the SharedInformerFactory to the specified namespace.
+func WithNamespace(namespace string) SharedInformerOption {
+	return func(factory *sharedInformerFactory) *sharedInformerFactory {
+		factory.namespace = namespace
+		return factory
+	}
+}
+
+// NewSharedInformerFactory constructs a new instance of sharedInformerFactory for all namespaces.
+func NewSharedInformerFactory(client versioned.Interface, defaultResync time.Duration) SharedInformerFactory {
+	return NewSharedInformerFactoryWithOptions(client, defaultResync)
+}
+
+// NewFilteredSharedInformerFactory constructs a new instance of sharedInformerFactory.
+// Listers obtained via this SharedInformerFactory will be subject to the same filters
+// as specified here.
+// Deprecated: Please use NewSharedInformerFactoryWithOptions instead
+func NewFilteredSharedInformerFactory(client versioned.Interface, defaultResync time.Duration, namespace string, tweakListOptions internalinterfaces.TweakListOptionsFunc) SharedInformerFactory {
+	return NewSharedInformerFactoryWithOptions(client, defaultResync, WithNamespace(namespace), WithTweakListOptions(tweakListOptions))
+}
+
+// NewSharedInformerFactoryWithOptions constructs a new instance of a SharedInformerFactory with additional options.
+func NewSharedInformerFactoryWithOptions(client versioned.Interface, defaultResync time.Duration, options ...SharedInformerOption) SharedInformerFactory {
+	factory := &sharedInformerFactory{
+		client:           client,
+		namespace:        v1.NamespaceAll,
+		defaultResync:    defaultResync,
+		informers:        make(map[reflect.Type]cache.SharedIndexInformer),
+		startedInformers: make(map[reflect.Type]bool),
+		customResync:     make(map[reflect.Type]time.Duration),
+	}
+
+	// Apply all options
+	for _, opt := range options {
+		factory = opt(factory)
+	}
+
+	return factory
+}
+
+// Start initializes all requested informers.
+func (f *sharedInformerFactory) Start(stopCh <-chan struct{}) {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+
+	for informerType, informer := range f.informers {
+		if !f.startedInformers[informerType] {
+			go informer.Run(stopCh)
+			f.startedInformers[informerType] = true
+		}
+	}
+}
+
+// WaitForCacheSync waits for all started informers' cache were synced.
+func (f *sharedInformerFactory) WaitForCacheSync(stopCh <-chan struct{}) map[reflect.Type]bool {
+	informers := func() map[reflect.Type]cache.SharedIndexInformer {
+		f.lock.Lock()
+		defer f.lock.Unlock()
+
+		informers := map[reflect.Type]cache.SharedIndexInformer{}
+		for informerType, informer := range f.informers {
+			if f.startedInformers[informerType] {
+				informers[informerType] = informer
+			}
+		}
+		return informers
+	}()
+
+	res := map[reflect.Type]bool{}
+	for informType, informer := range informers {
+		res[informType] = cache.WaitForCacheSync(stopCh, informer.HasSynced)
+	}
+	return res
+}
+
+// InternalInformerFor returns the SharedIndexInformer for obj using an internal
+// client.
+func (f *sharedInformerFactory) InformerFor(obj runtime.Object, newFunc internalinterfaces.NewInformerFunc) cache.SharedIndexInformer {
+	f.lock.Lock()
+	defer f.lock.Unlock()
+
+	informerType := reflect.TypeOf(obj)
+	informer, exists := f.informers[informerType]
+	if exists {
+		return informer
+	}
+
+	resyncPeriod, exists := f.customResync[informerType]
+	if !exists {
+		resyncPeriod = f.defaultResync
+	}
+
+	informer = newFunc(f.client, resyncPeriod)
+	f.informers[informerType] = informer
+
+	return informer
+}
+
+// SharedInformerFactory provides shared informers for resources in all known
+// API group versions.
+type SharedInformerFactory interface {
+	internalinterfaces.SharedInformerFactory
+	ForResource(resource schema.GroupVersionResource) (GenericInformer, error)
+	WaitForCacheSync(stopCh <-chan struct{}) map[reflect.Type]bool
+
+	Zalando() zalandoorg.Interface
+}
+
+func (f *sharedInformerFactory) Zalando() zalandoorg.Interface {
+	return zalandoorg.New(f, f.namespace, f.tweakListOptions)
+}

pkg/client/informers/externalversions/generic.go

@@ -0,0 +1,62 @@
+/*
+Copyright 2020 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+// Code generated by informer-gen. DO NOT EDIT.
+
+package externalversions
+
+import (
+	"fmt"
+
+	v1 "github.com/zalando-incubator/kube-metrics-adapter/pkg/apis/zalando.org/v1"
+	schema "k8s.io/apimachinery/pkg/runtime/schema"
+	cache "k8s.io/client-go/tools/cache"
+)
+
+// GenericInformer is type of SharedIndexInformer which will locate and delegate to other
+// sharedInformers based on type
+type GenericInformer interface {
+	Informer() cache.SharedIndexInformer
+	Lister() cache.GenericLister
+}
+
+type genericInformer struct {
+	informer cache.SharedIndexInformer
+	resource schema.GroupResource
+}
+
+// Informer returns the SharedIndexInformer.
+func (f *genericInformer) Informer() cache.SharedIndexInformer {
+	return f.informer
+}
+
+// Lister returns the GenericLister.
+func (f *genericInformer) Lister() cache.GenericLister {
+	return cache.NewGenericLister(f.Informer().GetIndexer(), f.resource)
+}
+
+// ForResource gives generic access to a shared informer of the matching type
+// TODO extend this to unknown resources with a client pool
+func (f *sharedInformerFactory) ForResource(resource schema.GroupVersionResource) (GenericInformer, error) {
+	switch resource {
+	// Group=zalando.org, Version=v1
+	case v1.SchemeGroupVersion.WithResource("scheduledscalings"):
+		return &genericInformer{resource: resource.GroupResource(), informer: f.Zalando().V1().ScheduledScalings().Informer()}, nil
+
+	}
+
+	return nil, fmt.Errorf("no informer found for %v", resource)
+}