Remove comments from migration script and add usage data

db/migrate/20180912111628_add_knative_application.rb

 # frozen_string_literal: true
 
-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
 class AddKnativeApplication < ActiveRecord::Migration
   include Gitlab::Database::MigrationHelpers
 
-  # Set this constant to true if this migration requires downtime.
   DOWNTIME = false
 
-  # When a migration requires downtime you **must** uncomment the following
-  # constant and define a short and easy to understand explanation as to why the
-  # migration requires downtime.
-  # DOWNTIME_REASON = ''
-
-  # When using the methods "add_concurrent_index", "remove_concurrent_index" or
-  # "add_column_with_default" you must disable the use of transactions
-  # as these methods can not run in an existing transaction.
-  # When using "add_concurrent_index" or "remove_concurrent_index" methods make sure
-  # that either of them is the _only_ method called in the migration,
-  # any other changes should go in a separate migration.
-  # This ensures that upon failure _only_ the index creation or removing fails
-  # and can be retried or reverted easily.
-  #
-  # To disable transactions uncomment the following line and remove these
-  # comments:
-  # disable_ddl_transaction!
-
   def change
     create_table "clusters_applications_knative" do |t|
       t.references :cluster, null: false, unique: true, foreign_key: { on_delete: :cascade }

lib/gitlab/usage_data.rb

@@ -62,6 +62,7 @@ module Gitlab
             clusters_applications_ingress: count(::Clusters::Applications::Ingress.installed),
             clusters_applications_prometheus: count(::Clusters::Applications::Prometheus.installed),
             clusters_applications_runner: count(::Clusters::Applications::Runner.installed),
+            clusters_applications_knative: count(::Clusters::Applications::Knative.installed),
             in_review_folder: count(::Environment.in_review_folder),
             groups: count(Group),
             issues: count(Issue),

spec/lib/gitlab/usage_data_spec.rb

@@ -20,6 +20,7 @@ describe Gitlab::UsageData do
       create(:clusters_applications_ingress, :installed, cluster: gcp_cluster)
       create(:clusters_applications_prometheus, :installed, cluster: gcp_cluster)
       create(:clusters_applications_runner, :installed, cluster: gcp_cluster)
+      create(:clusters_applications_knative, :installed, cluster: gcp_cluster)
     end
 
     subject { described_class.data }
@@ -81,6 +82,7 @@ describe Gitlab::UsageData do
         clusters_applications_ingress
         clusters_applications_prometheus
         clusters_applications_runner
+        clusters_applications_knative
         in_review_folder
         groups
         issues
@@ -126,6 +128,7 @@ describe Gitlab::UsageData do
       expect(count_data[:clusters_applications_ingress]).to eq(1)
       expect(count_data[:clusters_applications_prometheus]).to eq(1)
       expect(count_data[:clusters_applications_runner]).to eq(1)
+      expect(count_data[:clusters_applications_knative]).to eq(1)
     end
 
     it 'works when queries time out' do