New tab (Metrics) in instructor dashboard

Metrics tab shows student data:
  -Count of students opened a subsection
  -Grade distribution per problem

for each section/subsection of the course.

Implemented for both the old and beta dashboard
Controlled by a feature flag 'CLASS_DASHBOARD'
Data is aggregated across all students
Aggregate data computed from courseware_studentmodule

lms/djangoapps/instructor/views/instructor_dashboard.py

@@ -23,7 +23,7 @@ from django_comment_client.utils import has_forum_access
 from django_comment_common.models import FORUM_ROLE_ADMINISTRATOR
 from student.models import CourseEnrollment
 from bulk_email.models import CourseAuthorization
-
+from class_dashboard.dashboard_data import get_section_display_name, get_array_section_has_problem
 
 from .tools import get_units_with_due_date, title_or_url
 
@@ -31,7 +31,7 @@ from .tools import get_units_with_due_date, title_or_url
 @ensure_csrf_cookie
 @cache_control(no_cache=True, no_store=True, must_revalidate=True)
 def instructor_dashboard_2(request, course_id):
-    """Display the instructor dashboard for a course."""
+    """ Display the instructor dashboard for a course. """
 
     course = get_course_by_id(course_id, depth=None)
     is_studio_course = (modulestore().get_modulestore_type(course_id) != XML_MODULESTORE_TYPE)
@@ -64,6 +64,10 @@ def instructor_dashboard_2(request, course_id):
        is_studio_course and CourseAuthorization.instructor_email_enabled(course_id):
         sections.append(_section_send_email(course_id, access, course))
 
+    # Gate access to Metrics tab by featue flag and staff authorization
+    if settings.FEATURES['CLASS_DASHBOARD'] and access['staff']:
+        sections.append(_section_metrics(course_id, access))
+
     studio_url = None
     if is_studio_course:
         studio_url = get_cms_course_link(course)
@@ -228,3 +232,15 @@ def _section_analytics(course_id, access):
         'proxy_legacy_analytics_url': reverse('proxy_legacy_analytics', kwargs={'course_id': course_id}),
     }
     return section_data
+
+
+def _section_metrics(course_id, access):
+    """Provide data for the corresponding dashboard section """
+    section_data = {
+        'section_key': 'metrics',
+        'section_display_name': ('Metrics'),
+        'access': access,
+        'sub_section_display_name': get_section_display_name(course_id),
+        'section_has_problem': get_array_section_has_problem(course_id)
+    }
+    return section_data

lms/djangoapps/instructor/views/legacy.py

@@ -53,6 +53,7 @@ from instructor_task.api import (
 )
 from instructor_task.views import get_task_completion_info
 from edxmako.shortcuts import render_to_response, render_to_string
+from class_dashboard import dashboard_data
 from psychometrics import psychoanalyze
 from student.models import CourseEnrollment, CourseEnrollmentAllowed, unique_id_for_user
 from student.views import course_from_id
@@ -817,6 +818,14 @@ def instructor_dashboard(request, course_id):
         for analytic_name in DASHBOARD_ANALYTICS:
             analytics_results[analytic_name] = get_analytics_result(analytic_name)
 
+    #----------------------------------------
+    # Metrics
+
+    metrics_results = {}
+    if settings.FEATURES.get('CLASS_DASHBOARD') and idash_mode == 'Metrics':
+        metrics_results['section_display_name'] = dashboard_data.get_section_display_name(course_id)
+        metrics_results['section_has_problem'] = dashboard_data.get_array_section_has_problem(course_id)
+
     #----------------------------------------
     # offline grades?
 
@@ -900,7 +909,8 @@ def instructor_dashboard(request, course_id):
         'cohorts_ajax_url': reverse('cohorts', kwargs={'course_id': course_id}),
 
         'analytics_results': analytics_results,
-        'disable_buttons': disable_buttons
+        'disable_buttons': disable_buttons,
+        'metrics_results': metrics_results,
     }
 
     if settings.FEATURES.get('ENABLE_INSTRUCTOR_BETA_DASHBOARD'):