Add graphs and retention metrics to admin dashboard (#16829)

app/controllers/api/v1/admin/dimensions_controller.rb

@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::DimensionsController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action :require_staff!
+  before_action :set_dimensions
+
+  def create
+    render json: @dimensions, each_serializer: REST::Admin::DimensionSerializer
+  end
+
+  private
+
+  def set_dimensions
+    @dimensions = Admin::Metrics::Dimension.retrieve(
+      params[:keys],
+      params[:start_at],
+      params[:end_at],
+      params[:limit]
+    )
+  end
+end

app/controllers/api/v1/admin/measures_controller.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::MeasuresController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action :require_staff!
+  before_action :set_measures
+
+  def create
+    render json: @measures, each_serializer: REST::Admin::MeasureSerializer
+  end
+
+  private
+
+  def set_measures
+    @measures = Admin::Metrics::Measure.retrieve(
+      params[:keys],
+      params[:start_at],
+      params[:end_at]
+    )
+  end
+end

app/controllers/api/v1/admin/retention_controller.rb

@@ -0,0 +1,22 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::RetentionController < Api::BaseController
+  protect_from_forgery with: :exception
+
+  before_action :require_staff!
+  before_action :set_cohorts
+
+  def create
+    render json: @cohorts, each_serializer: REST::Admin::CohortSerializer
+  end
+
+  private
+
+  def set_cohorts
+    @cohorts = Admin::Metrics::Retention.new(
+      params[:start_at],
+      params[:end_at],
+      params[:frequency]
+    ).cohorts
+  end
+end

app/controllers/api/v1/admin/trends_controller.rb

@@ -0,0 +1,16 @@
+# frozen_string_literal: true
+
+class Api::V1::Admin::TrendsController < Api::BaseController
+  before_action :require_staff!
+  before_action :set_trends
+
+  def index
+    render json: @trends, each_serializer: REST::Admin::TagSerializer
+  end
+
+  private
+
+  def set_trends
+    @trends = TrendingTags.get(10, filtered: false)
+  end
+end

app/controllers/api/v1/instances/activity_controller.rb

@@ -14,22 +14,21 @@ class Api::V1::Instances::ActivityController < Api::BaseController
   private
 
   def activity
-    weeks = []
+    statuses_tracker      = ActivityTracker.new('activity:statuses:local', :basic)
+    logins_tracker        = ActivityTracker.new('activity:logins', :unique)
+    registrations_tracker = ActivityTracker.new('activity:accounts:local', :basic)
 
-    12.times do |i|
-      day     = i.weeks.ago.to_date
-      week_id = day.cweek
-      week    = Date.commercial(day.cwyear, week_id)
+    (0...12).map do |i|
+      start_of_week = i.weeks.ago
+      end_of_week   = start_of_week + 6.days
 
-      weeks << {
-        week: week.to_time.to_i.to_s,
-        statuses: Redis.current.get("activity:statuses:local:#{week_id}") || '0',
-        logins: Redis.current.pfcount("activity:logins:#{week_id}").to_s,
-        registrations: Redis.current.get("activity:accounts:local:#{week_id}") || '0',
+      {
+        week: start_of_week.to_i.to_s,
+        statuses: statuses_tracker.sum(start_of_week, end_of_week).to_s,
+        logins: logins_tracker.sum(start_of_week, end_of_week).to_s,
+        registrations: registrations_tracker.sum(start_of_week, end_of_week).to_s,
       }
     end
-
-    weeks
   end
 
   def require_enabled_api!