[stable/rabbitmq] Metrics: use ipv4 to connect to rabbit. (#17092)

* [stable/rabbitmq] Metrics: use ipv4 to connect to rabbit.

Otherwise, it could try to access IPv6 which may not be available, causing:

Get http://localhost:15672/api/nodes?sort=: dial tcp [::1]:15672: connect: cannot assign requested address

Signed-off-by: Cédric de Saint Martin <cdesaintmartin@wiremind.fr>

* Make it configurable.

Signed-off-by: Cédric de Saint Martin <cdesaintmartin@wiremind.fr>

stable/rabbitmq/Chart.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 name: rabbitmq
-version: 6.4.5
+version: 6.5.0
 appVersion: 3.7.17
 description: Open source message broker software that implements the Advanced Message Queuing Protocol (AMQP)
 keywords:

stable/rabbitmq/templates/statefulset.yaml

@@ -156,7 +156,7 @@ spec:
             command:
               - sh
               - -c
-              - rabbitmq-api-check "http://{{ .Values.rabbitmq.username }}:$RABBITMQ_PASSWORD@127.0.0.1:{{ .Values.service.managerPort }}/api/healthchecks/node" '{"status":"ok"}' 
+              - rabbitmq-api-check "http://{{ .Values.rabbitmq.username }}:$RABBITMQ_PASSWORD@127.0.0.1:{{ .Values.service.managerPort }}/api/healthchecks/node" '{"status":"ok"}'
           initialDelaySeconds: {{ .Values.livenessProbe.initialDelaySeconds }}
           timeoutSeconds: {{ .Values.livenessProbe.timeoutSeconds }}
           periodSeconds: {{ .Values.livenessProbe.periodSeconds }}
@@ -243,7 +243,7 @@ spec:
               name: {{ template "rabbitmq.secretPasswordName" . }}
               key: rabbitmq-password
         - name: RABBIT_URL
-          value: "http://localhost:{{ .Values.service.managerPort }}"
+          value: "http://{{ .Values.metrics.rabbitmqAddress }}:{{ .Values.service.managerPort }}"
         - name: RABBIT_USER
           value: {{ .Values.rabbitmq.username }}
         {{ if .Values.metrics.capabilities }}
@@ -288,7 +288,7 @@ spec:
         {{- if .Values.rabbitmq.advancedConfiguration}}
             - key: advanced.config
               path: advanced.config
-        {{- end }}      
+        {{- end }}
             - key: enabled_plugins
               path: enabled_plugins
         {{- if .Values.rabbitmq.loadDefinition.enabled }}

stable/rabbitmq/values.yaml

@@ -310,6 +310,10 @@ metrics:
   env: {}
   ## Metrics exporter port
   port: 9419
+  ## RabbitMQ address to connect to (from the same Pod, usually the local loopback address).
+  ## If your Kubernetes cluster does not support IPv6, you can change to `127.0.0.1` in order to force IPv4.
+  ## ref: https://kubernetes.io/docs/concepts/workloads/pods/pod-overview/#networking
+  rabbitmqAddress: localhost
   ## Comma-separated list of extended scraping capabilities supported by the target RabbitMQ server
   ## ref: https://github.com/kbudde/rabbitmq_exporter#extended-rabbitmq-capabilities
   capabilities: "bert,no_sort"