Explicitly persist the legacy_abac value of the cluster_provider_gcp so that we can disable abac if the `:rbac_clusters` feature flag is enabled

project_custom_attributes and group_custom_attributes used datetime
instead of datetime_with_timezone column type in database schema. But
actually migration defines `t.timestamps_with_timezone`.

This makes sure that newly created columns would be available when
migrating in one go.

If user has configure the setting then it will be passed to gitlab-shell
and gitlab-workhorse

On GitLab.com, there are over 2 million orphaned label links out of
a total of 13 million. These orphaned label links can cause
quiet failures, such as unexpected nil values in ExportCsvWorker.

Closes gitlab-org/gitlab-ee#7482

This MR backports PrometheusMetric model to CE
and adds: common, identifier to figure out what kind of metric is used.

commit 8ea114e5c349ad23f7293cf8141798aa6c9384e3
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Aug 17 13:32:14 2018 +0900

    Remove redandant parentheses

commit 3eb34f9305980701f0c1528f95fd615c1ca4d50d
Merge: 24308e4d1da 46494f46
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Aug 17 13:22:05 2018 +0900

    Merge branch 'master-ce' into add-background-migration-for-legacy-traces

commit 24308e4d1dab6fbf8437afc56fff7b83cc7ce534
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 16:39:20 2018 +0900

    Fix spec

commit 5a63312d1b36296440da6a874bb667b7dc06869c
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 14:46:59 2018 +0900

    Format SQL in MIgrateLegacyArtifacts class

commit 8894196d2aa2f9bf153cb03fef9603858478db70
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 14:31:18 2018 +0900

    Remove unnecessary index

commit d9753ac058fc48c8f594ee90064f675f7a869b17
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 14:24:20 2018 +0900

    Decouple pertial index to a different migration file

commit 1ce4a9bec6a4f0f981f4139c1a146ca7d887e6ba
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 14:14:03 2018 +0900

    Simplified adding file_location column

commit 47b101fae914470dc4d048f6d33c509ec8270656
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 14:11:42 2018 +0900

    Remove add_column_with_default

commit 80ec4f774f50bbf66e65f283f8fba541c6334e1c
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 14:02:46 2018 +0900

    Simplified job_artifact_uploader

commit d835dab36e85f4fc7a7d0735ede0f0ea081178bf
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 13:59:03 2018 +0900

    Elaborate comments on `file_location`

commit 6e78f23683bbae1372783f19179206369d7fbae7
Merge: fcef07ef361 79fdfec5
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Aug 16 13:39:28 2018 +0900

    Merge branch 'master-ce' into add-background-migration-for-legacy-traces

commit fcef07ef361080823432071722897321b2dd8354
Merge: 1eac3083194 bf9fd9c3
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Jul 6 21:46:22 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit 1eac30831947cceec7610be6acc7d3bffadaf617
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Jul 6 21:45:49 2018 +0900

    Use SQL instead of strip_heredoc

commit 08b17e517722e1e4ef8b60e753d53d697953a293
Merge: c0f48ff243d dc478a82
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Jul 5 23:20:37 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit c0f48ff243ddbe8af6c63aa0170538717191f44a
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Jul 5 17:37:40 2018 +0900

    Fix flaky spec

commit d082dab7cb456f9b31e76f49d1db46b606ba13ce
Merge: 8d6059d08ff 116955c4
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Jul 5 17:35:06 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit 8d6059d08fffaa99689afe32b66d93b538fb62f2
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jul 4 21:39:09 2018 +0900

    Fix static analysys failure

commit c4bdb18d582c520723a73c4c90c522332fa94d36
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jul 4 20:16:16 2018 +0900

    Cleanup spec

commit 469e826429feb6a8ce66eb5d5e087f7182eb8813
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jul 4 19:09:12 2018 +0900

    Clean up migrate_legacy_artifacts spec

commit dee84be650ad5afc9f18ac05eccb0736e4b1c121
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jul 4 18:13:19 2018 +0900

    Set default value at the database level

commit b32cb2f8a7e03238cf97d90f9e05ca11b5c8b687
Merge: 83f7c970ad8 4c1a2a9b
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jul 4 17:06:02 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit 83f7c970ad821f1b52999398070facf59f320479
Merge: 823629c1d9a 275fbf24
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jul 3 18:39:36 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit 823629c1d9aac5e7dcfb6bc393557a72ca3370b4
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jul 2 14:59:54 2018 +0900

    Decouple background migrations of filling nullified file_locations

commit 42ec60e8a74478c62962f5c66abfbe3e908d9e49
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jul 2 14:46:38 2018 +0900

    Unify partial index migrations

commit c145e9306419f704b14e2a92f51a9cf2d105f7e7
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jul 2 14:24:14 2018 +0900

    Make file_location non-null values

commit a442456f6a83327b2736f49b9522084b5675d129
Merge: c2cafa1051c 3cf68362
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jul 2 13:16:29 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit c2cafa1051cb7a4582c93b653e0ef3506ee11af4
Merge: 8e5f4f88410 e38db196
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Jun 28 17:13:48 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit 8e5f4f884107c0f574545f043fbacea2698ef3a4
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 27 18:54:03 2018 +0900

    Remove unneccesary specs

commit 86c1c68b1000770fcf8086fa71801b332fb6df5a
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 27 18:05:36 2018 +0900

    Add a partial index on ci_builds.id for legacy artifacts search

commit 70aa08c89bb6cd9b12d38b64cbf1838fb919c30f
Merge: 37801122 292cf668
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 27 17:15:33 2018 +0900

    Merge branch 'master' into add-background-migration-for-legacy-traces

commit 37801122
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu Jun 7 14:18:00 2018 +0900

    Clean up migration code. Defining migration custom class in  only post migration file which requires it for each_batch

commit 5cfe7331
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 23:57:03 2018 +0900

    Remove indexing for mysql. with_legacy_artifacts targets all archive rows. Enhance tests.

commit 696c030d
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 19:59:35 2018 +0900

    Fix static analysys. Split methods. Use `file_types`

commit 86217c65
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 18:55:15 2018 +0900

    Use raw sql for better readability

commit df449404
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 17:47:39 2018 +0900

    Revert unneccesary change

commit 764977a1
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 16:09:14 2018 +0900

    Remove AddIndexToCiBuildsArtifactsFile. Add temporary index in background migration class.

commit 7728ab3f
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 15:28:50 2018 +0900

    Try to explicitly separate with postgresql and mysql for addin index

commit b95b47b9
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 14:29:18 2018 +0900

    Dry up code by referring `BackgroundMigration` namespace. Use `BETWEEN` raw SQL to make the edge case explicit.

commit 5b404e46
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 14:15:37 2018 +0900

    Use `store_path` to make spec more explicit

commit 9f80de8e
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 14:03:26 2018 +0900

    Use length not limit

commit f78503f3
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Wed Jun 6 13:48:51 2018 +0900

    Add length back for indexing

commit b96a57d5
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 12:42:14 2018 +0000

    Update schema.rb

commit 9c25acc9
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 12:40:48 2018 +0000

    Add the guard clause in #down method too

commit 2bd5dadb
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 19:41:08 2018 +0900

    Add a gurad caluse to block adding concurrent index for mysql

commit 9a5e1276
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 19:20:33 2018 +0900

    Specify length of index in schema.rb manually for resolving mysql errors

commit c0ec68af
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 17:51:40 2018 +0900

    Separate add_concurrent_index by database type

commit b5f4ed37
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 17:30:19 2018 +0900

    Fix length size to use TEXT

commit b38b5605
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 17:20:35 2018 +0900

    Fix schema version for background migration spec

commit 32c48ef7
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 16:22:00 2018 +0900

    Specify length of indexed column. (This is neccessary for TEXT type)

commit a2e975f2
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue Jun 5 15:13:42 2018 +0900

    Fix spec; migrate_legacy_artifacts_to_job_artifacts_spec.rb

commit c78c1e3f
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jun 4 20:15:23 2018 +0900

    Separate add_concurrent_index migration from background migration

commit ad55e33b
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jun 4 19:59:14 2018 +0900

    Revert "Remove index_exists? guard"

    This reverts commit d76807838cf06e023b608c16426174a752a8ccf5.

commit b2693be7
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jun 4 17:11:47 2018 +0900

    Remove index_exists? guard

commit a2eb053d
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jun 4 15:41:54 2018 +0900

    Wrap insertion and deletion in a single transaction

commit d4bb2c70
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon Jun 4 15:08:17 2018 +0900

    Add temporary index to ci_builds.artifacts_file to speed up SELECT query

commit 33d62be9
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon May 28 17:31:38 2018 +0900

    Add test for legacy path proxy

commit 57ab71a0
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon May 28 15:59:36 2018 +0900

    Optimize queries. Add some tests for filtering logic.

commit 8f24dfaa
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Mon May 28 15:30:38 2018 +0900

    Fix static analysis

commit ccc60ddd
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu May 24 16:51:59 2018 +0900

    Add changelog

commit fdbdb07a
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu May 24 16:50:55 2018 +0900

    Add spec for migrations

commit 04886af8
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu May 24 14:48:31 2018 +0900

    Revise comments

commit 55bcbee0
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Thu May 24 14:40:29 2018 +0900

    Revise comments

commit db662867
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 17:27:12 2018 +0900

    Add spec base (Not finished)

commit e92dcc39
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 17:26:49 2018 +0900

    Added artifacts_metadata_store to remove in background migration

commit 91388399
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 17:26:20 2018 +0900

    Add a condition to exclude jobs which have job_artifacts already

commit e084ce11
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 16:51:15 2018 +0900

    Clean up migrate_legacy_artifacts.rb (Fix static analysys)

commit ca4e5d33
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 16:32:59 2018 +0900

    Remove the culcuration method of metadata size

commit eac4c75b
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 16:11:16 2018 +0900

    Remove Gitlab::BackgroundMigration:: scope

commit 4a5ca96b
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 16:09:09 2018 +0900

    Add limit to file_location column

commit 49ff3d9c
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 16:05:22 2018 +0900

    Use size.to_i instead of if-condition

commit 526656e6
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 15 16:02:57 2018 +0900

    Rename current_path to hashed_path

commit 8e6faca7
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 8 16:53:43 2018 +0900

    Rename location_1/2 to current/legacy_path

commit 50345432
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Tue May 1 21:44:10 2018 +0900

    Rename path_type to file_location. Fix JobArtifactUploader to look up correct file location.

commit 4f7e3503
Author: Shinya Maeda <shinya@gitlab.com>
Date:   Fri Apr 27 17:33:15 2018 +0900

    Add background migration for legacy artifacts

Add default_value_for to file_location column

Set file_location explicityly with default_values_for

Add file_location to factory

Remove tests of default_values_for

Set file_location nil as default

See https://gitlab.com/gitlab-org/gitlab-ce/issues/49446.

This whitelists all existing places where we use "destroy_all".

Allow specificying a branch filter for a project hook and only trigger
a project hook if either the branch filter is blank or the branch matches.
Only supported for push_events for now.

it will decide the method for disable statement_timeout upon
per transaction or per session, based on how it's called.

When calling with a block, block will be executed and it will use
session based statement_timeout, otherwise will default to existing
behavior.