hpa

_helpers.tpl

{{/* vim: set filetype=mustache: */}}
{{/*
Create chart name and version as used by the chart label.
*/}}
{{- define "workers.hpa_metric_name" -}}
{{- printf "%s-%s" .Release.Namespace .Release.Name | replace "+" "_" | replace "-" "_" | trunc 63 -}}
{{- end -}}

hpa.yaml

{{ if (eq $.Values.autoscaling.enabled true) }}
apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  name: {{ $.Release.Name }}
  namespace: {{ $.Release.Namespace }}
spec:
  groups:
    - name: {{ $.Release.Name }}-queue-size # Define the name of your rule
      rules:
        - record: {{ include "workers.hpa_metric_name" . }}_messages_waiting_in_queue_name # The name of the metrics you want
          expr: rabbitmq_queue_messages{queue="{{ $.Values.autoscaling.rabbitmq.queue }}", vhost="{{ $.Values.autoscaling.rabbitmq.vhost }}", namespace="{{ $.Values.autoscaling.rabbitmq.namespace }}" } # Query to make to prometheus
          labels:
            namespace: {{ $.Release.Namespace }}

---
apiVersion: autoscaling/v2beta2
kind: HorizontalPodAutoscaler
metadata:
  name: {{ $.Release.Name }}
spec:
  scaleTargetRef:
    apiVersion: apps/v1
    kind: Deployment
    name: {{ $.Release.Name }}
  minReplicas: {{ $.Values.autoscaling.minReplicas }}
  maxReplicas: {{ $.Values.autoscaling.maxReplicas }}
  metrics:
    - type: Object
      object:
        metric:
          name: {{ include "workers.hpa_metric_name" . }}_messages_waiting_in_queue_name
        describedObject:
          apiVersion: v1
          kind: Namespace
          name: {{ $.Release.Namespace }}
        target:
          type: Value
          value: {{ $.Values.autoscaling.rabbitmq.value }}

{{- end }}

values.yaml

autoscaling:
  enabled: true
  rabbitmq:
    vhost: "/"
    queue: "test"
    namespace: "test"
    value: 1
  minReplicas: 1
  maxReplicas: 10