[prometheus-fastly-exporter] add backward compatibility for legacy ingress values

Support both legacy format (hosts as strings + top-level path) and
modern format (hosts as objects with host/paths/pathType). Uses kindIs
to detect string hosts and falls back to ingress.path for the path.

Signed-off-by: Denis Arslanbekov <denis@arslanbekov.com>

Author: arslanbekov

charts/prometheus-fastly-exporter/templates/ingress.yaml

@@ -27,6 +27,18 @@ spec:
   {{- end }}
   rules:
     {{- range .Values.ingress.hosts }}
+    {{- if kindIs "string" . }}
+    - host: {{ . | quote }}
+      http:
+        paths:
+          - path: {{ $.Values.ingress.path | default "/" }}
+            pathType: ImplementationSpecific
+            backend:
+              service:
+                name: {{ $fullName }}
+                port:
+                  number: {{ $svcPort }}
+    {{- else }}
     - host: {{ .host | quote }}
       http:
         paths:
@@ -40,4 +52,5 @@ spec:
                   number: {{ $svcPort }}
           {{- end }}
     {{- end }}
+    {{- end }}
 {{- end }}

charts/prometheus-fastly-exporter/values.yaml

@@ -52,6 +52,11 @@ ingress:
   # className: nginx
   annotations: {}
     # kubernetes.io/tls-acme: "true"
+  # Legacy format (still supported):
+  #   path: /
+  #   hosts:
+  #     - chart-example.local
+  # Modern format (recommended):
   hosts:
     - host: chart-example.local
       paths: