Add autoscaler for collector (helm#19385)

Signed-off-by: Naseem <[email protected]>

Author: naseemkullah

incubator/jaeger/Chart.yaml

@@ -2,7 +2,7 @@ apiVersion: v1
 appVersion: 1.15.1
 description: A Jaeger Helm chart for Kubernetes
 name: jaeger
-version: 0.15.0
+version: 0.16.0
 keywords:
   - jaeger
   - opentracing

incubator/jaeger/README.md

@@ -208,6 +208,11 @@ The following table lists the configurable parameters of the Jaeger chart and th
 | `agent.service.zipkinThriftPort`         | zipkin.thrift over compact thrift   |  `5775`                                  |
 | `agent.useHostNetwork`                   | Enable hostNetwork for agents       |  `false`                                 |
 | `agent.tolerations`                      | Node Tolerations                    | `[]`                                   |
+| `collector.autoscaling.enabled`       | Enable horizontal pod autoscaling |  `false`                                   |
+| `collector.autoscaling.minReplicas`   | Minimum replicas |  2                                   |
+| `collector.autoscaling.maxReplicas`   | Maximum replicas |  10                                   |
+| `collector.autoscaling.targetCPUUtilizationPercentage` | Target CPU utilization |  80                                  |
+| `collector.autoscaling.targetMemoryUtilizationPercentage` | Target memory utilization |  `nil`                                   |
 | `collector.cmdlineParams`                | Additional command line parameters  |  `nil`                                   |
 | `collector.podAnnotations`               | Annotations for Collector pod       |  `nil`                                   |
 | `collector.service.httpPort`             | Client port for HTTP thrift         |  `14268`                                 |

incubator/jaeger/templates/collector-deploy.yaml

@@ -14,7 +14,9 @@ metadata:
 {{ toYaml .Values.collector.annotations | indent 4 }}
 {{- end }}
 spec:
+{{- if not .Values.collector.autoscaling.enabled }}
   replicas: {{ .Values.collector.replicaCount }}
+{{- end }}
   selector:
     matchLabels:
       app.kubernetes.io/name: {{ include "jaeger.name" . }}

incubator/jaeger/templates/collector-hpa.yaml

@@ -0,0 +1,30 @@
+{{- if .Values.collector.autoscaling.enabled }}
+apiVersion: autoscaling/v2beta1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ template "jaeger.collector.name" . }}
+  labels:
+    app.kubernetes.io/name: {{ include "jaeger.name" . }}
+    helm.sh/chart: {{ include "jaeger.chart" . }}
+    app.kubernetes.io/component: collector
+    app.kubernetes.io/managed-by: {{ .Release.Service }}
+    app.kubernetes.io/instance: {{ .Release.Name }}
+spec:
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ template "jaeger.collector.name" . }}
+  minReplicas: {{ .Values.collector.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.collector.autoscaling.maxReplicas }}
+  metrics:
+    - type: Resource
+      resource:
+        name: cpu
+        targetAverageUtilization: {{ .Values.collector.autoscaling.targetCPUUtilizationPercentage | default 80 }}
+  {{- if .Values.collector.autoscaling.targetMemoryUtilizationPercentage }}
+    - type: Resource
+      resource:
+        name: memory
+        targetAverageUtilization: {{ .Values.collector.autoscaling.targetMemoryUtilizationPercentage }}
+  {{- end }}
+{{- end }}

incubator/jaeger/values.yaml

@@ -151,6 +151,12 @@ collector:
   dnsPolicy: ClusterFirst
   cmdlineParams: {}
   replicaCount: 1
+  autoscaling:
+    enabled: false
+    minReplicas: 2
+    maxReplicas: 10
+    # targetCPUUtilizationPercentage: 80
+    # targetMemoryUtilizationPercentage: 80
   service:
     annotations: {}
     # List of IP ranges that are allowed to access the load balancer (if supported)