Merge pull request #66 from summerwind/org-runner-autoscale

feat: Organizational RunnerDeployment Autoscaling

README.md

@@ -199,13 +199,25 @@ In the below example, `actions-runner` checks for pending workflow runs for each
 apiVersion: actions.summerwind.dev/v1alpha1
 kind: RunnerDeployment
 metadata:
-  name: summerwind-actions-runner-controller
+  name: example-runner-deployment
 spec:
-  minReplicas: 1
-  maxReplicas: 3
   template:
     spec:
       repository: summerwind/actions-runner-controller
+---
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: HorizontalRunnerAutoscaler
+metadata:
+  name: example-runner-deployment-autoscaler
+spec:
+  scaleTargetRef:
+    name: example-runner-deployment
+  minReplicas: 1
+  maxReplicas: 3
+  metrics:
+  - type: TotalNumberOfQueuedAndInProgressWorkflowRuns
+    repositoryNames:
+    - summerwind/actions-runner-controller
 ```
 
 Please also note that the sync period is set to 10 minutes by default and it's configurable via `--sync-period` flag.
@@ -217,14 +229,26 @@ By default, it doesn't scale down until the grace period of 10 minutes passes af
 apiVersion: actions.summerwind.dev/v1alpha1
 kind: RunnerDeployment
 metadata:
-  name: summerwind-actions-runner-controller
+  name: example-runner-deployment
 spec:
-  minReplicas: 1
-  maxReplicas: 3
-  scaleDownDelaySecondsAfterScaleUp: 1m
   template:
     spec:
       repository: summerwind/actions-runner-controller
+---
+apiVersion: actions.summerwind.dev/v1alpha1
+kind: HorizontalRunnerAutoscaler
+metadata:
+  name: example-runner-deployment-autoscaler
+spec:
+  scaleTargetRef:
+    name: example-runner-deployment
+  minReplicas: 1
+  maxReplicas: 3
+  scaleDownDelaySecondsAfterScaleOut: 60
+  metrics:
+  - type: TotalNumberOfQueuedAndInProgressWorkflowRuns
+    repositoryNames:
+    - summerwind/actions-runner-controller
 ```
 
 ## Additional tweaks

api/v1alpha1/horizontalrunnerautoscaler_types.go

@@ -0,0 +1,102 @@
+/*
+Copyright 2020 The actions-runner-controller 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.
+*/
+
+package v1alpha1
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// HorizontalRunnerAutoscalerSpec defines the desired state of HorizontalRunnerAutoscaler
+type HorizontalRunnerAutoscalerSpec struct {
+	// ScaleTargetRef sis the reference to scaled resource like RunnerDeployment
+	ScaleTargetRef ScaleTargetRef `json:"scaleTargetRef,omitempty"`
+
+	// MinReplicas is the minimum number of replicas the deployment is allowed to scale
+	// +optional
+	MinReplicas *int `json:"minReplicas,omitempty"`
+
+	// MinReplicas is the maximum number of replicas the deployment is allowed to scale
+	// +optional
+	MaxReplicas *int `json:"maxReplicas,omitempty"`
+
+	// ScaleDownDelaySecondsAfterScaleUp is the approximate delay for a scale down followed by a scale up
+	// Used to prevent flapping (down->up->down->... loop)
+	// +optional
+	ScaleDownDelaySecondsAfterScaleUp *int `json:"scaleDownDelaySecondsAfterScaleOut,omitempty"`
+
+	// Metrics is the collection of various metric targets to calculate desired number of runners
+	// +optional
+	Metrics []MetricSpec `json:"metrics,omitempty"`
+}
+
+type ScaleTargetRef struct {
+	Name string `json:"name,omitempty"`
+}
+
+type MetricSpec struct {
+	// Type is the type of metric to be used for autoscaling.
+	// The only supported Type is TotalNumberOfQueuedAndInProgressWorkflowRuns
+	Type string `json:"type,omitempty"`
+
+	// RepositoryNames is the list of repository names to be used for calculating the metric.
+	// For example, a repository name is the REPO part of `github.com/USER/REPO`.
+	// +optional
+	RepositoryNames []string `json:"repositoryNames,omitempty"`
+}
+
+type HorizontalRunnerAutoscalerStatus struct {
+	// ObservedGeneration is the most recent generation observed for the target. It corresponds to e.g.
+	// RunnerDeployment's generation, which is updated on mutation by the API Server.
+	// +optional
+	ObservedGeneration int64 `json:"observedGeneration,omitempty"`
+
+	// DesiredReplicas is the total number of desired, non-terminated and latest pods to be set for the primary RunnerSet
+	// This doesn't include outdated pods while upgrading the deployment and replacing the runnerset.
+	// +optional
+	DesiredReplicas *int `json:"desiredReplicas,omitempty"`
+
+	// +optional
+	LastSuccessfulScaleOutTime *metav1.Time `json:"lastSuccessfulScaleOutTime,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+// +kubebuilder:subresource:status
+// +kubebuilder:printcolumn:JSONPath=".spec.minReplicas",name=Min,type=number
+// +kubebuilder:printcolumn:JSONPath=".spec.maxReplicas",name=Max,type=number
+// +kubebuilder:printcolumn:JSONPath=".status.desiredReplicas",name=Desired,type=number
+
+// HorizontalRunnerAutoscaler is the Schema for the horizontalrunnerautoscaler API
+type HorizontalRunnerAutoscaler struct {
+	metav1.TypeMeta   `json:",inline"`
+	metav1.ObjectMeta `json:"metadata,omitempty"`
+
+	Spec   HorizontalRunnerAutoscalerSpec   `json:"spec,omitempty"`
+	Status HorizontalRunnerAutoscalerStatus `json:"status,omitempty"`
+}
+
+// +kubebuilder:object:root=true
+
+// HorizontalRunnerAutoscalerList contains a list of HorizontalRunnerAutoscaler
+type HorizontalRunnerAutoscalerList struct {
+	metav1.TypeMeta `json:",inline"`
+	metav1.ListMeta `json:"metadata,omitempty"`
+	Items           []HorizontalRunnerAutoscaler `json:"items"`
+}
+
+func init() {
+	SchemeBuilder.Register(&HorizontalRunnerAutoscaler{}, &HorizontalRunnerAutoscalerList{})
+}

api/v1alpha1/runnerdeployment_types.go

@@ -20,24 +20,15 @@ import (
 	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
 )
 
+const (
+	AutoscalingMetricTypeTotalNumberOfQueuedAndInProgressWorkflowRuns = "TotalNumberOfQueuedAndInProgressWorkflowRuns"
+)
+
 // RunnerReplicaSetSpec defines the desired state of RunnerDeployment
 type RunnerDeploymentSpec struct {
 	// +optional
 	Replicas *int `json:"replicas,omitempty"`
 
-	// MinReplicas is the minimum number of replicas the deployment is allowed to scale
-	// +optional
-	MinReplicas *int `json:"minReplicas,omitempty"`
-
-	// MinReplicas is the maximum number of replicas the deployment is allowed to scale
-	// +optional
-	MaxReplicas *int `json:"maxReplicas,omitempty"`
-
-	// ScaleDownDelaySecondsAfterScaleUp is the approximate delay for a scale down followed by a scale up
-	// Used to prevent flapping (down->up->down->... loop)
-	// +optional
-	ScaleDownDelaySecondsAfterScaleUp *int `json:"scaleDownDelaySecondsAfterScaleOut,omitempty"`
-
 	Template RunnerTemplate `json:"template"`
 }
 
@@ -49,9 +40,6 @@ type RunnerDeploymentStatus struct {
 	// This doesn't include outdated pods while upgrading the deployment and replacing the runnerset.
 	// +optional
 	Replicas *int `json:"desiredReplicas,omitempty"`
-
-	// +optional
-	LastSuccessfulScaleOutTime *metav1.Time `json:"lastSuccessfulScaleOutTime,omitempty"`
 }
 
 // +kubebuilder:object:root=true