Merge pull request #4357 from edx/jibsheet/rename-common-with-security

Rename common_with_security and document it better

playbooks/edx-east/common_with_security.yml → playbooks/edx-east/common_edx_base.yml

-- name: Deploy common
+# This is a playbook that edX uses to ensure that common configuration is
+# deployed, security updates are applied, users accounts are updated on the
+# machines and our monitoring software is updated or installed.
+#
+- name: Deploy common base edX configuration
   hosts: all
   become: True
   gather_facts: True
@@ -7,3 +11,11 @@
     COMMON_SECURITY_UPDATES: true
   roles:
     - common
+    - role: datadog
+      when: COMMON_ENABLE_DATADOG
+    - role: splunkforwarder
+      when: COMMON_ENABLE_SPLUNKFORWARDER
+    - role: newrelic
+      when: COMMON_ENABLE_NEWRELIC
+    - role: newrelic_infrastructure
+      when: COMMON_ENABLE_NEWRELIC_INFRASTRUCTURE