[apm-server] Add missing fields to HPA

apm-server/README.md

@@ -86,7 +86,7 @@ as a reference. They are also used in the automated testing of this chart.
 |--------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------|
 | `affinity`               | Configurable [affinity][]                                                                                                                                  | `{}`                               |
 | `apmConfig`              | Allows you to add any config files in `/usr/share/apm-server/config` such as `apm-server.yml`                                                              | see [values.yaml][]                |
-| `autoscaling`            | Enable the [horizontal pod autoscaler][]                                                                                                                   | `enabled: false`                   |
+| `autoscaling`            | Enable and configure the [horizontal pod autoscaler][]                                                                                                     | see [values.yaml][]                |                          |
 | `envFrom`                | Templatable string to be passed to the [environment from variables][] which will be appended to the `envFrom:` definition for the container                | `[]`                               |
 | `extraContainers`        | Templatable string of additional containers to be passed to the `tpl` function                                                                             | `""`                               |
 | `extraEnvs`              | Extra [environment variables][] which will be appended to the `env:` definition for the container                                                          | `[]`                               |

apm-server/templates/hpa.yaml

@@ -14,4 +14,13 @@ spec:
     apiVersion: apps/v1
     kind: Deployment
     name: {{ template "apm.fullname" . }}
+  minReplicas: {{ .Values.autoscaling.minReplicas }}
+  maxReplicas: {{ .Values.autoscaling.maxReplicas }}
+  metrics:
+  - type: Resource
+    resource:
+      name: cpu
+      target:
+        type: Utilization
+        averageUtilization: {{ .Values.autoscaling.averageCpuUtilization }}
 {{- end }}

apm-server/tests/apmserver_test.py

@@ -341,3 +341,12 @@ def test_setting_fullnameOverride():
         ]
         == project
     )
+
+def test_enabling_horizontal_pod_autoscaler():
+    config = """
+autoscaling:
+  enabled: true
+"""
+    r = helm_template(config)
+
+    assert "horizontalpodautoscaler" in r

apm-server/values.yaml

@@ -142,6 +142,9 @@ fullnameOverride: ""
 
 autoscaling:
   enabled: false
+  minReplicas: 1
+  maxReplicas: 3
+  averageCpuUtilization: 50
 
 ingress:
   enabled: false