Add horizontal pod autoscaler to helm chart (hypertrace#46)

Author: ravisingal

helm/templates/hpa.yaml

@@ -0,0 +1,19 @@
+{{- if .Values.hpa.enabled }}
+apiVersion: autoscaling/v1
+kind: HorizontalPodAutoscaler
+metadata:
+  name: {{ .Chart.Name }}
+  labels:
+    release: {{ .Release.Name }}
+  {{- with .Values.podLabels }}
+    {{- toYaml . | nindent 4 }}
+  {{- end }}
+spec:
+  minReplicas: {{ int .Values.hpa.minReplicas }}
+  maxReplicas: {{ int .Values.hpa.maxReplicas }}
+  scaleTargetRef:
+    apiVersion: apps/v1
+    kind: Deployment
+    name: {{ .Chart.Name }}
+  targetCPUUtilizationPercentage: {{ int .Values.hpa.targetCPUUtilizationPercentage }}
+{{- end }}

helm/values.yaml

@@ -134,19 +134,19 @@ configMap:
     receivers:
       otlp:
         protocols:
-          grpc: 
+          grpc:
             endpoint: "0.0.0.0:4317"
-          http: 
+          http:
             endpoint: "0.0.0.0:55681"
-      opencensus: 
+      opencensus:
         endpoint: "0.0.0.0:55678"
-      zipkin: 
+      zipkin:
         endpoint: "0.0.0.0:9411"
       jaeger:
         protocols:
-          grpc: 
+          grpc:
             endpoint: "0.0.0.0:14250"
-          thrift_http: 
+          thrift_http:
             endpoint: "0.0.0.0:14268"
       # Collect own metrics
       prometheus:
@@ -175,6 +175,12 @@ configMap:
           processors: [batch]
           exporters: [kafka]
 
+hpa:
+  enabled: false
+  minReplicas: 2
+  maxReplicas: 5
+  targetCPUUtilizationPercentage: 80
+
 kafka-topic-creator:
   jobName: jaeger-spans-kafka-topic-creator
   helmHook: pre-install,pre-upgrade