Use migration helper to prevent downtime migration
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class AddRunUntaggedToCiRunner < ActiveRecord::Migration
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##
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# Downtime expected!
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#
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# This migration will cause downtime due to exclusive lock
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# caused by the default value.
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#
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def change
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add_column :ci_runners, :run_untagged, :boolean, default: true, null: false
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include Gitlab::Database::MigrationHelpers
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disable_ddl_transaction!
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def up
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add_column_with_default(:ci_runners, :run_untagged, :boolean,
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default: true, allow_null: false)
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end
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def down
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remove_column(:ci_runners, :run_untagged)
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end
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end
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