Automatically add / to /metrics path

Author: YuryHrytsuk

charts/traefik/values.common.yaml.gotmpl

@@ -143,6 +143,17 @@ extraObjects:
       prefixes:
       - /metrics
 
+  # a (href) links do not work properly without trailing slash
+- apiVersion: traefik.io/v1alpha1
+  kind: Middleware
+  metadata:
+    name: metrics-path-append-slash
+    namespace: {{ .Release.Namespace }}
+  spec:
+    redirectRegex:
+      regex: "^(https?://[^/]+/metrics)$"
+      replacement: "${1}/"
+
 - apiVersion: networking.k8s.io/v1
   kind: Ingress
   metadata:

charts/victoria-metrics-stack/values.yaml.gotmpl

@@ -66,7 +66,10 @@ victoria-metrics-auth:
     annotations:
       namespace: {{ .Release.Namespace }}
       traefik.ingress.kubernetes.io/router.tls: "true"
-      traefik.ingress.kubernetes.io/router.middlewares: traefik-metrics-strip-prefix@kubernetescrd,traefik-traefik-basic-auth@kubernetescrd
+      traefik.ingress.kubernetes.io/router.middlewares: >-
+        traefik-metrics-path-append-slash@kubernetescrd,
+        traefik-metrics-strip-prefix@kubernetescrd,
+        traefik-traefik-basic-auth@kubernetescrd
       traefik.ingress.kubernetes.io/router.entrypoints: websecure
     hosts:
       - name: {{ requiredEnv "K8S_MONITORING_FQDN" }}