Adds INSIGHTS_LEARNER_API_LIST_DOWNLOAD_FIELDS

which is used by the Learner List view's "Download CSV" button to
determine the fields to include in the CSV, and their sort order.

playbooks/roles/insights/defaults/main.yml

@@ -54,6 +54,11 @@ INSIGHTS_THEME_SCSS: 'sass/themes/open-edx.scss'
 INSIGHTS_RESEARCH_URL: 'https://www.edx.org/research-pedagogy'
 INSIGHTS_OPEN_SOURCE_URL: 'http://set-me-please'
 
+# Comma-delimited list of field names to include in the Learner List CSV download
+# e.g., "username,segments,cohort,engagements.videos_viewed,last_updated"
+# Default (null) includes all available fields, in alphabetical order
+INSIGHTS_LEARNER_API_LIST_DOWNLOAD_FIELDS: !!null
+
 INSIGHTS_DATABASE_NAME: 'dashboard'
 
 INSIGHTS_DATABASES:
@@ -126,6 +131,7 @@ INSIGHTS_CONFIG:
   CSRF_COOKIE_NAME: "{{ INSIGHTS_CSRF_COOKIE_NAME | default('insights_csrftoken') }}"
   LANGUAGE_COOKIE_NAME: "{{ INSIGHTS_LANGUAGE_COOKIE_NAME | default('insights_language') }}"
   CMS_COURSE_SHORTCUT_BASE_URL: "{{ INSIGHTS_CMS_COURSE_SHORTCUT_BASE_URL }}"
+  LEARNER_API_LIST_DOWNLOAD_FIELDS: "{{ INSIGHTS_LEARNER_API_LIST_DOWNLOAD_FIELDS }}"
 
 INSIGHTS_NEWRELIC_APPNAME: "{{ COMMON_ENVIRONMENT }}-{{ COMMON_DEPLOYMENT }}-analytics-api"
 INSIGHTS_PIP_EXTRA_ARGS: "-i {{ COMMON_PYPI_MIRROR_URL }}"