remove grade_calculator_performance_improvements release flag

closes EVAL-1285
flag=grade_calculator_performance_improvements

Test Plan:
- specs pass

Change-Id: Ic60680a0bf9936b0b39b728b8caf93ffc90e6b84
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/251886
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>
Reviewed-by: Kai Bjorkman <kbjorkman@instructure.com>
Reviewed-by: Adrian Packel <apackel@instructure.com>
Product-Review: Syed Hussain <shussain@instructure.com>
QA-Review: Spencer Olson <solson@instructure.com>

config/feature_flags/apogee_release_flags.yml

@@ -24,11 +24,6 @@ datadog_rum_js:
   applies_to: SiteAdmin
   display_name: Datadog RUM JS Agent
   description: Include the Datadog RUM JS Agent in the document HEAD.
-grade_calculator_performance_improvements:
-  state: hidden
-  applies_to: SiteAdmin
-  display_name: Grade Calculator Performance Improvements
-  description: Performance improvements for the grade calculation process.
 gradebook_dataloader_improvements:
   state: hidden
   applies_to: SiteAdmin

lib/grade_calculator.rb

@@ -133,24 +133,13 @@ class GradeCalculator
     # done after calculate_hidden_scores -- so changes in that inner call are also captured. But
     # it must be done before calculate_course_score so if @update_course_score is true (we are
     # scoring a grading period, not a course) we don't trigger an additional alert/live event here.
-    if performance_improvements_enabled?
-      create_course_grade_alerts_and_live_events(scores_prior_to_compute)
-    else
-      old_create_course_grade_alerts_and_live_events(scores_prior_to_compute)
-    end
+    create_course_grade_alerts_and_live_events(scores_prior_to_compute)
 
     calculate_course_score if @update_course_score
   end
 
   private
 
-  # TODO: delete this method once grade_calculator_performance_improvements is enabled everywhere
-  def performance_improvements_enabled?
-    return @performance_improvements_enabled if defined?(@performance_improvements_enabled)
-
-    @performance_improvements_enabled = Account.site_admin.feature_enabled?(:grade_calculator_performance_improvements)
-  end
-
   def effective_due_dates
     @effective_due_dates ||= EffectiveDueDates.for_course(@course, @assignments).filter_students_to(@user_ids)
   end
@@ -162,21 +151,6 @@ class GradeCalculator
       uniq
   end
 
-  # TODO: delete this method once grade_calculator_performance_improvements is enabled everywhere
-  def old_create_course_grade_alerts_and_live_events(scores)
-    @course.shard.activate do
-      ActiveRecord::Associations::Preloader.new.preload(scores, :enrollment)
-      # Make only one alert per user even if they have multiple enrollments (sections in same course)
-      scores = scores.uniq{|s| s.enrollment.user_id}
-      reloaded_scores = Score.where(id: scores.map(&:id)).index_by(&:id)
-      scores.each do |score|
-        # Note: only the old score has enrollment pre-loaded
-        create_course_grade_live_event(score, reloaded_scores[score.id]) if @emit_live_event
-        old_create_course_grade_alert(score, reloaded_scores[score.id])
-      end
-    end
-  end
-
   def create_course_grade_alerts_and_live_events(scores)
     @course.shard.activate do
       ActiveRecord::Associations::Preloader.new.preload(scores, :enrollment)
@@ -214,25 +188,6 @@ class GradeCalculator
     Canvas::LiveEvents.course_grade_change(score, old_score_values, old_score.enrollment)
   end
 
-  # TODO: delete this method once grade_calculator_performance_improvements is enabled everywhere
-  def old_create_course_grade_alert(old_score, score)
-    # Use preloaded enrollment in old_score
-    thresholds = ObserverAlertThreshold.active.where(student: old_score.enrollment.user_id, alert_type: ['course_grade_high', 'course_grade_low'])
-
-    thresholds.each do |threshold|
-      next unless threshold.did_pass_threshold(old_score.current_score, score.current_score)
-      next unless threshold.observer.enrollments.where(course_id: @course.id).first.present?
-
-      ObserverAlert.create(observer: threshold.observer, student: threshold.student,
-        observer_alert_threshold: threshold,
-        context: @course, action_date: score.updated_at, alert_type: threshold.alert_type,
-        title: I18n.t("Course grade: %{grade}% in %{course_code}", {
-          grade: score.current_score,
-          course_code: @course.course_code
-        }))
-    end
-  end
-
   def create_course_grade_alert(old_score, score, thresholds)
     thresholds.each do |threshold|
       next unless threshold.did_pass_threshold(old_score.current_score, score.current_score)

spec/lib/grade_calculator_coffee_spec.rb

@@ -22,7 +22,6 @@ require_relative '../sharding_spec_helper'
 
 describe GradeCalculator do
   before :once do
-    Account.site_admin.enable_feature!(:grade_calculator_performance_improvements)
     course_with_student active_all: true
   end
 

spec/lib/grade_calculator_spec.rb

@@ -22,7 +22,6 @@ require_relative '../sharding_spec_helper'
 
 describe GradeCalculator do
   before :once do
-    Account.site_admin.enable_feature!(:grade_calculator_performance_improvements)
     course_with_student active_all: true
   end
 

spec/models/lti/lti_outbound_adapter_spec.rb

@@ -351,7 +351,6 @@ describe Lti::LtiOutboundAdapter do
     let(:enrollment) { StudentEnrollment.create!(user: user, course: course, workflow_state: 'active') }
 
     before do
-      allow(Account.site_admin).to receive(:feature_enabled?).with(:grade_calculator_performance_improvements).and_return(true)
       allow(BasicLTI::Sourcedid).to receive(:encryption_secret) {'encryption-secret-5T14NjaTbcYjc4'}
       allow(BasicLTI::Sourcedid).to receive(:signing_secret) {'signing-secret-vp04BNqApwdwUYPUI'}
       assignment.update!(

spec/models/observer_alert_spec.rb

@@ -23,10 +23,6 @@ describe ObserverAlert do
   include Api
   include Api::V1::ObserverAlertThreshold
 
-  before(:each) do
-    Account.site_admin.enable_feature!(:grade_calculator_performance_improvements)
-  end
-
   describe 'validations' do
     before :once do
       @student = user_model