Add kube_scheduler config spec (#7614)

* Add kube_scheduler config spec

* Update base requirement

kube_scheduler/assets/configuration/spec.yaml

@@ -0,0 +1,55 @@
+name: Kube_scheduler
+files:
+- name: kube-scheduler.yaml
+  options:
+  - template: init_config
+    options:
+      - template: init_config/openmetrics
+  - template: instances
+    options:
+    - name: leader_election
+      description: |
+        Monitor the leader-election process on the kube-system:kube-scheduler endpoints.
+      value:
+        type: boolean
+        example: true
+    - template: instances/openmetrics
+      overrides:
+        prometheus_url.value.example: http://localhost:10251/metrics
+        prometheus_url.display_priority: 1
+
+- name: auto_conf.yaml
+  options:
+  - template: ad_identifiers
+    overrides:
+      value.example:
+      - kube-scheduler
+  - template: init_config
+    options: []
+  - template: instances
+    options:
+    - name: prometheus_url
+      required: true
+      description: The URL where your application metrics are exposed by Prometheus.
+      value:
+        example: http://%%host%%:10251/metrics
+        type: string
+    - name: bearer_token_auth
+      description: |
+        Used if you are using RBACs and need the Agent to authenticate
+        against the APIServer to retrieve metrics. Default to true.
+      value:
+        type: boolean
+        example: true
+    - name: bearer_token_path
+      description: Used to specify the path where the service account token is located.
+      value:
+        type: string
+        default: /var/run/secrets/kubernetes.io/serviceaccount/token
+        example: /var/run/secrets/kubernetes.io/serviceaccount/token
+    - name: ssl_verify
+      description: Used to verify self signed certificates.
+      value:
+        type: boolean
+        default: false
+        example: false

kube_scheduler/datadog_checks/kube_scheduler/data/auto_conf.yaml

@@ -1,16 +1,36 @@
+## @param ad_identifiers - list of strings - required
+## A list of container identifiers that are used by Autodiscovery to identify
+## which container the check should be run against. For more information, see:
+## https://docs.datadoghq.com/agent/guide/ad_identifiers/
+#
 ad_identifiers:
   - kube-scheduler
 
+## All options defined here are available to all instances.
+#
 init_config:
 
+## Every instance is scheduled independent of the others.
+#
 instances:
+
     ## @param prometheus_url - string - required
     ## The URL where your application metrics are exposed by Prometheus.
     #
-  - prometheus_url: "http://%%host%%:10251/metrics"
+  - prometheus_url: http://%%host%%:10251/metrics
 
-    ## @param bearer_token_auth - string - optional
+    ## @param bearer_token_auth - boolean - optional - default: true
     ## Used if you are using RBACs and need the Agent to authenticate
     ## against the APIServer to retrieve metrics. Default to true.
     #
-    bearer_token_auth: true
+    # bearer_token_auth: true
+
+    ## @param bearer_token_path - string - optional - default: /var/run/secrets/kubernetes.io/serviceaccount/token
+    ## Used to specify the path where the service account token is located.
+    #
+    # bearer_token_path: /var/run/secrets/kubernetes.io/serviceaccount/token
+
+    ## @param ssl_verify - boolean - optional - default: false
+    ## Used to verify self signed certificates.
+    #
+    # ssl_verify: false