Fix auto-discovery for latest versions on Kubernetes (#9577)

* [kube_apiserver_metrics] Update `auto_conf.yaml` to provide a list of possible Prometheus URLs

kube_apiserver_metrics/assets/configuration/spec.yaml

@@ -32,9 +32,24 @@ files:
     options: []
   - template: instances
     options:
-    - name: prometheus_url
+    - name: possible_prometheus_urls
       required: true
-      description: The URL where your application metrics are exposed by Prometheus.
+      description: |
+        The URLs to try to get your application metrics that are exposed by Prometheus.
+        The check will try each URLs in the list and will use the first working one.
+        One of possible_prometheus_urls or prometheus_url parameter is required.
+      value:
+        type: array
+        items:
+          type: string
+        example:
+          - https://%%host%%:6443/metrics
+          - https://%%host%%:8443/metrics
+    - name: prometheus_url
+      required: false
+      description: |
+        The URL where your application metrics are exposed by Prometheus.
+        One of possible_prometheus_urls or prometheus_url parameter is required.
       value:
         example: https://%%host%%:6443/metrics
         type: string

kube_apiserver_metrics/datadog_checks/kube_apiserver_metrics/data/auto_conf.yaml

@@ -14,10 +14,20 @@ init_config:
 #
 instances:
 
-    ## @param prometheus_url - string - required
+    ## @param possible_prometheus_urls - list of strings - required
+    ## The URLs to try to get your application metrics that are exposed by Prometheus.
+    ## The check will try each URLs in the list and will use the first working one.
+    ## One of possible_prometheus_urls or prometheus_url parameter is required.
+    #
+  - possible_prometheus_urls:
+      - https://%%host%%:6443/metrics
+      - https://%%host%%:8443/metrics
+
+    ## @param prometheus_url - string - optional - default: https://%%host%%:6443/metrics
     ## The URL where your application metrics are exposed by Prometheus.
+    ## One of possible_prometheus_urls or prometheus_url parameter is required.
     #
-  - prometheus_url: https://%%host%%:6443/metrics
+    # prometheus_url: https://%%host%%:6443/metrics
 
     ## @param bearer_token_auth - boolean - optional - default: true
     ## Used if you are using RBACs and need the Agent to authenticate