setup datadog agent on each host.

- set agent version to 7

ansible-5/roles/datadog.datadog/tasks/agent5-linux.yml

@@ -0,0 +1,77 @@
+---
+- name: (agent5) Create Datadog agent config directory
+  file:
+    dest: /etc/dd-agent
+    state: directory
+    mode: 0755
+  when: datadog_manage_config
+
+- name: (agent5) Create main Datadog agent configuration file
+  template:
+    src: datadog.conf.j2
+    dest: /etc/dd-agent/datadog.conf
+    owner: "{{ datadog_user }}"
+    group: "{{ datadog_group }}"
+    mode: 0644 #FIXME: should have permissions set to only be readable by owner
+  when: datadog_manage_config
+  notify: restart datadog-agent
+
+- name: (agent5) Ensure datadog-agent is running
+  service:
+    name: datadog-agent
+    state: started
+    enabled: yes
+  when: not datadog_skip_running_check and datadog_enabled and not ansible_check_mode
+
+- name: (agent5) Ensure datadog-agent is not running
+  service:
+    name: datadog-agent
+    state: stopped
+    enabled: no
+  when: not datadog_skip_running_check and not datadog_enabled
+
+- name: Register all checks files present in datadog
+  find:
+    paths: /etc/dd-agent/conf.d/
+    patterns:
+    - "*.yaml"
+    file_type: file
+  register: datadog_conf_files
+  when: datadog_manage_config and datadog_disable_untracked_checks
+
+- name: Register all checks files present in datadog
+  find:
+    paths: /etc/dd-agent/conf.d/
+    patterns:
+    - "*.yaml.default"
+    file_type: file
+  register: datadog_conf_files_default
+  when: datadog_manage_config and datadog_disable_default_checks
+
+- name: Delete checks not present in datadog_tracked_checks
+  file:
+    path: "/etc/dd-agent/conf.d/{{ item }}.yaml"
+    state: absent
+  loop: "{{ datadog_conf_files.files | map(attribute='path') | list | map('basename') | list | map('regex_replace', '^(.*).yaml$', '\\1') | list }}"
+  when: datadog_manage_config and datadog_disable_untracked_checks and item not in datadog_tracked_checks
+  notify: restart datadog-agent
+
+- name: Delete default checks
+  file:
+    path: "/etc/dd-agent/conf.d/{{ item }}.yaml.default"
+    state: absent
+  loop: "{{ datadog_conf_files_default.files | map(attribute='path') | list
+             | map('basename') | list | map('regex_replace', '^(.*).yaml.default$', '\\1') | list }}"
+  when: datadog_manage_config and datadog_disable_default_checks and item not in datadog_tracked_checks
+  notify: restart datadog-agent
+
+- name: (agent5) Create a configuration file for each Datadog check
+  template:
+    src: checks.yaml.j2
+    dest: "/etc/dd-agent/conf.d/{{ item }}.yaml"
+    owner: "{{ datadog_user }}"
+    group: "{{ datadog_group }}"
+    mode: 0644 #FIXME: should have permissions set to only be readable by owner
+  with_items: "{{ datadog_checks|list }}"
+  when: datadog_manage_config
+  notify: restart datadog-agent