use the YAML style parameters

playbooks/roles/datadog/files/etc/yum.repo.d/datadog.repo

-[datadog]
-name = Datadog, Inc.
-baseurl = http://yum.datadoghq.com/rpm/
-enabled=1
-gpgcheck=0
\ No newline at end of file

playbooks/roles/datadog/handlers/main.yml

 ---
-
 - name: restart the datadog service
-  service: name=datadog-agent state=restarted
+  service:
+    name: datadog-agent
+    state: restarted

playbooks/roles/datadog/tasks/main.yml

 ---
-
 #
 # datadog
 #
@@ -14,49 +13,58 @@
 #   - common
 #   - datadog
 #
-
-- name: install debian needed pkgs
-  apt: pkg={{ item }}
-  with_items: datadog_debian_pkgs
-  tags:
-    - datadog
-
-- name: add apt key
-  apt_key: id=C7A7DA52 url={{ COMMON_UBUNTU_APT_KEYSERVER }}{{ datadog_apt_key }} state=present
+- name: Install debian needed pkgs
+  apt:
+    name: "{{ item }}"
+    state: present
+  with_items: "{{ datadog_debian_pkgs }}"
   tags:
     - datadog
 
-- name: remove unstable apt repository
-  apt_repository: repo='deb http://apt.datadoghq.com/ unstable main' state=absent
+- name: Add apt key for datadog
+  apt_key:
+    id: "C7A7DA52"
+    url: "{{ COMMON_UBUNTU_APT_KEYSERVER }}{{ datadog_apt_key }}"
+    state: present
   tags:
     - datadog
 
-- name: install apt repository
-  apt_repository: repo='deb http://apt.datadoghq.com/ stable main' update_cache=yes
+- name: Install apt repository for datadog
+  apt_repository:
+    repo: 'deb http://apt.datadoghq.com/ stable main'
+    state: present
+    update_cache: yes
   tags:
     - datadog
 
-- name: install datadog agent
-  apt: pkg="datadog-agent={{ datadog_agent_version }}"
+- name: Install datadog agent
+  apt:
+    name: "datadog-agent={{ datadog_agent_version }}"
   tags:
     - datadog
 
-- name: bootstrap config
-  shell: cp /etc/dd-agent/datadog.conf.example /etc/dd-agent/datadog.conf creates=/etc/dd-agent/datadog.conf
+- name: Bootstrap config
+  shell: cp datadog.conf.example datadog.conf
+  args:
+    chdir: /etc/dd-agent/
+    creates: /etc/dd-agent/datadog.conf
   tags:
     - datadog
 
-- name: update api-key
-  lineinfile: >
-    dest="/etc/dd-agent/datadog.conf"
-    regexp="^api_key:.*"
-    line="api_key:{{ DATADOG_API_KEY }}"
+- name: Update api-key
+  lineinfile:
+    dest: "/etc/dd-agent/datadog.conf"
+    regexp: "^api_key:.*"
+    line: "api_key:{{ DATADOG_API_KEY }}"
   notify:
     - restart the datadog service
   tags:
     - datadog
 
-- name: ensure started and enabled
-  service: name=datadog-agent state=started enabled=yes
+- name: Ensure started and enabled
+  service:
+    name: datadog-agent
+    state: started
+    enabled: yes
   tags:
     - datadog