Merge branch 'async_rm_index_mrm_merged_by_id' into 'master'

Remove index asynchronously from merge_request_metrics

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142370



Merged-by: Gregory Havenga <11164960-ghavenga@users.noreply.gitlab.com>
Approved-by: Gregory Havenga <11164960-ghavenga@users.noreply.gitlab.com>
Co-authored-by: Martin Schurz <Martin.Schurz@telekom.de>

db/post_migrate/20240121163000_async_drop_index_merge_request_metrics_on_merged_by_id.rb

+# frozen_string_literal: true
+
+class AsyncDropIndexMergeRequestMetricsOnMergedById < Gitlab::Database::Migration[2.2]
+  milestone '16.9'
+
+  TABLE_NAME = 'merge_request_metrics'
+  INDEX_NAME = 'index_merge_request_metrics_on_merged_by_id'
+  COLUMN = 'merged_by_id'
+
+  # TODO: Index to be destroyed synchronously in https://gitlab.com/gitlab-org/gitlab/-/merge_requests/142357
+  def up
+    prepare_async_index_removal TABLE_NAME, COLUMN, name: INDEX_NAME
+  end
+
+  def down
+    unprepare_async_index TABLE_NAME, COLUMN, name: INDEX_NAME
+  end
+end

db/schema_migrations/20240121163000

+e114eaec6871b8e61e52c68f8f7ab7cea05e969b74379fba24da0cbb1243190a
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