Enable management api metrics collection

The default rabbitmq image disables metrics collection via the management
api. This is implemented by adding a file named:

/etc/rabbitmq/conf.d/management_agent.disable_metrics_collector.conf

with the contents:

management_agent.disable_metrics_collector = true

The prometheus exporter currently used by osh requires this value to be
false.

This change was introduced when rabbit introduced the integrated
prometheus exporter:

docker-library/rabbitmq#419

Change-Id: I9a94f49a7827bb4725ed3fd98404e637bfefa086

rabbitmq/Chart.yaml

@@ -15,6 +15,6 @@ apiVersion: v1
 appVersion: v3.9.0
 description: OpenStack-Helm RabbitMQ
 name: rabbitmq
-version: 0.1.30
+version: 0.1.31
 home: https://github.com/rabbitmq/rabbitmq-server
 ...

rabbitmq/templates/configmap-etc.yaml

@@ -77,4 +77,8 @@ data:
   rabbitmq-env.conf: |
     SERVER_ADDITIONAL_ERL_ARGS={{ $erlvm_scheduler_conf | quote }}
 {{- end }}
+{{ if not .Values.conf.prometheus_exporter.rabbitmq_mgmt_metrics_collector_disabled }}
+  management_agent.disable_metrics_collector.conf: |
+    management_agent.disable_metrics_collector = false
+{{- end }}
 {{ end }}

rabbitmq/templates/statefulset.yaml

@@ -290,6 +290,12 @@ spec:
               subPath: erl_inetrc
               readOnly: true
 {{- end }}
+{{- if not .Values.conf.prometheus_exporter.rabbitmq_mgmt_metrics_collector_disabled }}
+            - name: rabbitmq-etc
+              mountPath: /etc/rabbitmq/conf.d/management_agent.disable_metrics_collector.conf
+              subPath: management_agent.disable_metrics_collector.conf
+              readOnly: true
+{{- end }}
 {{ dict "enabled" $envAll.Values.manifests.certificates "name" $envAll.Values.secrets.tls.oslo_messaging.server.internal "path" "/etc/rabbitmq/certs" | include "helm-toolkit.snippets.tls_volume_mount" | indent 12 }}
       volumes:
         - name: pod-tmp

rabbitmq/values.yaml

@@ -189,6 +189,7 @@ conf:
     skip_queues: "^$"
     include_queues: ".*"
     rabbit_exporters: "overview,exchange,node,queue"
+    rabbitmq_mgmt_metrics_collector_disabled: false
   # This IP could be IPv4/IPv6 and the tcp port will be appended to it and eventually it is set to rabbitmq.listeners.tcp.1
   bind_address: "::"
   rabbitmq:

releasenotes/notes/rabbitmq.yaml

@@ -30,4 +30,5 @@ rabbitmq:
   - 0.1.28 Add IPv6 environment support for rabbitmq
   - 0.1.29 Add build-in prometheus plugin and disable external exporter
   - 0.1.30 Add labels to rabbitmq service
+  - 0.1.31 Support management api metrics collection
 ...