onload performance beacon for LMS pages feature flags and rate environment

playbooks/roles/edxapp/defaults/main.yml

@@ -123,6 +123,8 @@ EDXAPP_MODULESTORE_MAPPINGS:
 
 EDXAPP_GIT_REPO_DIR: '/edx/var/edxapp/course_repos'
 
+EDXAPP_ONLOAD_BEACON_SAMPLE_RATE: 0.0
+
 EDXAPP_TENDER_DOMAIN: "None"
 EDXAPP_TENDER_SUBDOMAIN: "None"
 
@@ -170,6 +172,7 @@ EDXAPP_FEATURES:
   ENABLE_CROSS_DOMAIN_CSRF_COOKIE: false
   ENABLE_COUNTRY_ACCESS: false
   ENABLE_VIDEO_BEACON: false
+  ENABLE_ONLOAD_BEACON: false
 
 EDXAPP_BOOK_URL: ""
 # This needs to be set to localhost
@@ -635,6 +638,7 @@ generic_cache_config: &default_generic_cache
 
 generic_env_config:  &edxapp_generic_env
   ECOMMERCE_API_URL: "{{ EDXAPP_ECOMMERCE_API_URL }}"
+  ONLOAD_BEACON_SAMPLE_RATE: $EDXAPP_ONLOAD_BEACON_SAMPLE_RATE
   CORS_ORIGIN_WHITELIST: "{{ EDXAPP_CORS_ORIGIN_WHITELIST }}"
   CORS_ORIGIN_ALLOW_ALL: $EDXAPP_CORS_ORIGIN_ALLOW_ALL
   CROSS_DOMAIN_CSRF_COOKIE_DOMAIN: "{{ EDXAPP_CROSS_DOMAIN_CSRF_COOKIE_DOMAIN }}"