Remove unused merge request metrics.

- These are not being used anymore.
- Consolidate all issue metrics into a single migration.
- Consolidate all merge request metrics into a single migration.

app/models/merge_request/metrics.rb

@@ -2,22 +2,10 @@ class MergeRequest::Metrics < ActiveRecord::Base
   belongs_to :merge_request
 
   def record!
-    if !merge_request.work_in_progress? && self.wip_flag_first_removed_at.blank?
-      self.wip_flag_first_removed_at = Time.now
-    end
-
-    if merge_request.author_id != merge_request.assignee_id && self.first_assigned_to_user_other_than_author.blank?
-      self.first_assigned_to_user_other_than_author = Time.now
-    end
-
     if merge_request.merged? && self.merged_at.blank?
       self.merged_at = Time.now
     end
 
-    if merge_request.closed? && self.first_closed_at.blank?
-      self.first_closed_at = Time.now
-    end
-
     self.save if self.changed?
   end
 

db/migrate/20160824124900_add_table_issue_metrics.rb

@@ -27,6 +27,7 @@ class AddTableIssueMetrics < ActiveRecord::Migration
     create_table :issue_metrics do |t|
       t.references :issue, index: { name: "index_issue_metrics" }, foreign_key: true, null: false
 
+      t.datetime 'first_mentioned_in_commit_at'
       t.datetime 'first_associated_with_milestone_at'
       t.datetime 'first_added_to_board_at'
 

db/migrate/20160825052008_add_table_merge_request_metrics.rb

@@ -27,10 +27,10 @@ class AddTableMergeRequestMetrics < ActiveRecord::Migration
     create_table :merge_request_metrics do |t|
       t.references :merge_request, index: { name: "index_merge_request_metrics" }, foreign_key: true, null: false
 
-      t.datetime 'wip_flag_first_removed_at'
-      t.datetime 'first_assigned_to_user_other_than_author'
+      t.datetime 'latest_build_started_at'
+      t.datetime 'latest_build_finished_at'
+      t.datetime 'first_deployed_to_production_at'
       t.datetime 'merged_at'
-      t.datetime 'first_closed_at'
 
       t.timestamps null: false
     end

db/migrate/20160915061248_add_production_deploy_time_to_merge_request_metrics.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
-class AddProductionDeployTimeToMergeRequestMetrics < 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" 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" make sure that this
-  # method 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 fails and can be retried or reverted easily.
-  #
-  # To disable transactions uncomment the following line and remove these
-  # comments:
-  # disable_ddl_transaction!
-
-  def change
-    add_column :merge_request_metrics, :first_deployed_to_production_at, :datetime
-  end
-end

db/migrate/20160915072217_add_first_mentioned_in_commit_time_to_issue_metrics.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
-class AddFirstMentionedInCommitTimeToIssueMetrics < 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" 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" make sure that this
-  # method 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 fails and can be retried or reverted easily.
-  #
-  # To disable transactions uncomment the following line and remove these
-  # comments:
-  # disable_ddl_transaction!
-
-  def change
-    add_column :issue_metrics, :first_mentioned_in_commit_at, :datetime
-  end
-end

db/migrate/20160915081353_add_latest_build_time_to_merge_request_metrics.rb

-# See http://doc.gitlab.com/ce/development/migration_style_guide.html
-# for more information on how to write migrations for GitLab.
-
-class AddLatestBuildTimeToMergeRequestMetrics < 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" 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" make sure that this
-  # method 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 fails and can be retried or reverted easily.
-  #
-  # To disable transactions uncomment the following line and remove these
-  # comments:
-  # disable_ddl_transaction!
-
-  def change
-    add_column :merge_request_metrics, :latest_build_started_at, :datetime
-    add_column :merge_request_metrics, :latest_build_finished_at, :datetime
-  end
-end