Merge branch 'more-realistic-instance-statistics-seed-file' into 'master'

More realistic instance statistics seed file

See merge request gitlab-org/gitlab!44724

db/fixtures/development/29_instance_statistics.rb

@@ -3,17 +3,31 @@
 require './spec/support/sidekiq_middleware'
 
 Gitlab::Seeder.quiet do
+  chance_for_decrement = 0.1 # 10% chance that we'll generate smaller count than the previous count
+  max_increase = 10000
+  max_decrease = 1000
+
   model_class = Analytics::InstanceStatistics::Measurement
-  recorded_at = Date.today
 
-  # Insert random counts for the last 60 days
-  measurements = 60.times.flat_map do
-    recorded_at = (recorded_at - 1.day).end_of_day - 5.minutes
+  measurements = model_class.identifiers.flat_map do |_, id|
+    recorded_at = 60.days.ago
+    current_count = rand(1_000_000)
+
+    # Insert random counts for the last 60 days
+    Array.new(60) do
+      recorded_at = (recorded_at + 1.day).end_of_day - 5.minutes
+
+      # Normally our counts should slowly increase as the gitlab instance grows.
+      # Small chance (10%) to have a slight decrease (simulating cleanups, bulk delete)
+      if rand < chance_for_decrement
+        current_count -= rand(max_decrease)
+      else
+        current_count += rand(max_increase)
+      end
 
-    model_class.identifiers.map do |_, id|
       {
         recorded_at: recorded_at,
-        count: rand(1_000_000),
+        count: current_count,
         identifier: id
       }
     end