setup datadog agent on each host.

- set agent version to 7

ansible-5/roles/datadog.datadog/tasks/sanitize-checks.yml

@@ -0,0 +1,12 @@
+- name: Defend against defined but null datadog_checks variable
+  set_fact:
+      datadog_checks: "{{ datadog_checks | default({}, true) }}"
+
+- name: Resolve datadog_tracked_checks
+  set_fact:
+    datadog_tracked_checks: "{{ datadog_checks | list + datadog_additional_checks | default([], true) }}"
+
+- name: Check that datadog_checks is a mapping
+  assert:
+    that:
+      - datadog_checks is mapping