Partially addresses #47424.

This makes it more explicit that an environment is not a stop action,
but instead is merely contains a stop action.

commit 22e1cb8f4b98f71d21026f69aa3e68d79946d6ae
Merge: 766a42a9639 e966c6ae
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Fri Feb 23 21:30:46 2018 +0100

    Merge remote-tracking branch 'upstream/master' into 38783-add-cluster-metrics.yml

    # Conflicts:
    #	app/controllers/projects/prometheus/metrics_controller.rb
    #	app/controllers/projects/prometheus_controller.rb
    #	app/models/project_services/prometheus_service.rb
    #	lib/gitlab/prometheus/queries/query_additional_metrics.rb
    #	spec/controllers/projects/prometheus/metrics_controller_spec.rb
    #	spec/models/project_services/prometheus_service_spec.rb

commit 766a42a96393f502d439c1f0beb0b6cfb2c228d4
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Fri Feb 23 17:58:45 2018 +0100

    Move prometheus adapter to app/models/concerns

commit ca84eed49811cf3064a2e5ea611af1c947c590d7
Merge: 66702099586 cb504cedc2a
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Fri Feb 23 15:36:03 2018 +0100

    Merge remote-tracking branch 'upstream/backport_custom_metrics_ce_components' into 38783-add-cluster-metrics.yml

    + fix failing tests

    # Conflicts:
    #	app/controllers/projects/prometheus_controller.rb
    #	app/models/project_services/prometheus_service.rb
    #	lib/gitlab/prometheus/queries/query_additional_metrics.rb
    #	spec/models/project_services/prometheus_service_spec.rb

commit cb504cedc2a6e353ffb56833334681e3da09fc14
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Fri Feb 23 14:46:15 2018 +0100

    Fix prometheus_service found by find_or_initialize_service

commit 928b84c72c2c4c46e1785b9a943c1822a137de16
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 23:15:11 2018 +0100

    additional metrics and backported tests

commit 41291383b4b6976af94eaf9e1a7b2e2a172310e7
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 21:57:45 2018 +0100

    Introduce Metrics controller and retire prometheus controller

commit 6e7492e4c7ffa9d8621f09198071bc14be875976
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 21:46:37 2018 +0100

    Backport PrometheusClient::Error and all->common_metrics rename

commit 66702099586c864a7f78970a0ee0dd9f3c2beeef
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 20:23:03 2018 +0100

    fix failing tests

commit ce921ea723cde61b2441ba98c9aca97606c719c8
Author: Mike Greiling <mike@pixelcog.com>
Date:   Wed Feb 21 23:47:30 2018 -0600

    add labels to cluster metrics

commit 993830c6892e4fbf53d3f72da00002d642c7e9b2
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 01:20:49 2018 +0100

    Fix formatting probelms and few small tests

commit 66ee65d8e3f747c90d986bc3056178422156bc8e
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 01:08:03 2018 +0100

    stop using in deployment tests environment.id

commit 62c91978d15f0369988521363dae24bd7510d68d
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 01:06:33 2018 +0100

    fix prometheus_controller and adapter tests

commit 977b1d34c1d03c7233582e8328f85caf634895ed
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 22 00:19:39 2018 +0100

    finish up active? -> can_query? rename

commit e614f7daee58a9758d83ba3efe1649c8b80bc1e2
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Wed Feb 21 23:51:33 2018 +0100

    deployment prometheus adapter tests fix

commit ebd726c114a6026fef0adf3eba6ee1972530148a
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Wed Feb 21 21:40:40 2018 +0100

    Move environment dependant tests to environment

commit 6d31311cd3729c29233283dded70e03a4a9a3c97
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Wed Feb 21 20:40:24 2018 +0100

    update monitoring service and move adding dpeloyment_time to deployment model

commit 60b6bf391ab36846dce122bc6b0c5196a186267c
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Wed Feb 21 20:15:46 2018 +0100

    adjust deployment spec and prometheus specs

commit 6681662cf1c028aff2ff94aa0501732cb7119ba1
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 22:30:20 2018 +0100

    Revert changes to reactive caching

commit e282f86c45a056889f57d3f7fd23a81c88efff6a
Merge: 5751c73df59 6844a2df
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 22:08:17 2018 +0100

    Merge remote-tracking branch 'upstream/master' into 38783-add-cluster-metrics.yml

commit 5751c73df59d0a03840a1b4b71b0637670f971a6
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 22:07:43 2018 +0100

    rename active? to can_query? and cleanup environment prometheus router

commit 3f3c6e1d33dcd9315979daf26a95f2aab83a7de9
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 21:51:43 2018 +0100

    Fix tests, and only use prometheus service if its active

commit 6345838bac584c213b665d334252ccab202cb271
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 16:24:27 2018 +0100

    Fix typo

commit 7a585d32afe8da050b5615b1d036a550e06479f5
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 15:29:40 2018 +0100

    Cluster id is not required

commit e6af62afb11fa380f6aff1c31a81bcc9bab3b1eb
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 15:15:46 2018 +0100

    Result transformation support

commit f3b1bd7c67894f44efe33591ddb70093bd620c03
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 15:07:07 2018 +0100

    Fix rubocop warning and exten cluster query timeframe

commit be77947cea64261a4d3dead33c3c57f413a9880c
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 14:42:47 2018 +0100

    Fix additional metrics test

commit eb3922e16221abe16f59fae1c38122f227643343
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 14:34:44 2018 +0100

    rename prometheus adapter methods

commit 045476cd08b21593818b274ae8a44d19b705523f
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 13:19:36 2018 +0100

    Make prometheus adapter a module

commit f2daf050d8c689f72c4c61207930bc53c331f12e
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 20 12:00:44 2018 +0100

    refactoring wip

commit 52e4ef5587794e811dc10a0f2dca522342a865da
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Sun Feb 18 20:25:55 2018 +0100

    cleanup prometheus adapter concept

commit 3887365faab9dfcd9c00bcfc501d09ac62431a03
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Sun Feb 18 19:22:11 2018 +0100

    Refactor out deployment id, Rename PrometheusQuerier to PrometheusAdapter

commit aa2fc2df57bd72c9a5e94f66d1f1e23990be6c3f
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Fri Feb 16 23:59:54 2018 +0100

    Refactor prometheus client

commit e43c1ca9d9874d6cf1569f40fa1aca158d9d5d91
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 15 20:24:45 2018 +0100

    Use initial version of cluster_metrics.yml

commit 867821ce0b2609ebf8994220aa8e3a94d66a01e0
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 15 05:24:14 2018 +0100

    Fix querying cluster metrics

commit 1601e002a064cbb10ffe110a19433c5662858f1d
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 15 04:49:03 2018 +0100

    Queues for unicersal querier

commit 5db198fdc925c0223be24939b76da1d544dd569c
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 15 03:35:17 2018 +0100

    refactor reactive caching and prometheus querying

commit b0fc00e8c9d21e961ef44b0129103e2a62928b52
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Thu Feb 15 00:12:03 2018 +0100

    Add generic query additional metrics

commit ffe76e6a9ba196bccff22c4880e0384959ad5e48
Author: Pawel Chojnacki <pawel@chojnacki.ws>
Date:   Tue Feb 13 15:40:15 2018 +0100

    Cluster Metric yml initial

+ Remove cluster query

+ remove cluster_metrics.yml

+ Prometheus adapter tests

This does not seem to serve any clear purpose and causes other issues (see https://gitlab.com/gitlab-org/gitlab-ce/issues/43196#note_59275652)

Closes #39752

Environment names that contained a space would cause an error
in GitLab 10.1 because a new guard clause was introduced in
Repository#write_ref to prevent such references from
existing. Use the slug instead to ensure that the name
is valid.

Closes #39182

This removes the need for a default scope that adds a "WHERE project_id
= X" clause. This commit also includes an additional index for
Environment#last_deployment, ensuring this query uses just an index scan
instead of also applying a Filter.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36877

When querying the deployments of an environment the query Rails produces
will be along the lines of the following:

    SELECT *
    FROM deployments
    WHERE environment_id = X

For queries such as this (or queries that use this as their base and add
more conditions) there is no meaningful index that can be used as long
as deployments.project_id is not part of a WHERE clause.

To work around this we change that "has_many :deployments" relation to
always add a "WHERE project_id = X" condition. This means that queries
filtering deployments can make better use of the existing indexes. For
example, when filtering by deployments.iid this will result in the
following query:

    SELECT *
    FROM deployments
    WHERE environment_id = X
    AND project_id = Y
    AND iid = Z

This means PostgreSQL can use the existing index on
(project_id, environment_id, iid) instead of having to use a different
index (or none at all) and having to scan over a large amount of data.

Query plan wise this means that instead of this query and plan:

    EXPLAIN (BUFFERS, ANALYZE)
    SELECT deployments.*
    FROM deployments
    WHERE deployments.environment_id = 5
    AND deployments.iid = 225;

    Index Scan using index_deployments_on_project_id_and_iid on deployments  (cost=0.42..14465.75 rows=1 width=117) (actual time=6.394..38.048 rows=1 loops=1)
      Index Cond: (iid = 225)
      Filter: (environment_id = 5)
      Rows Removed by Filter: 839
      Buffers: shared hit=4534
    Planning time: 0.076 ms
    Execution time: 38.073 ms

We produce the following query and plan:

    EXPLAIN (BUFFERS, ANALYZE)
    SELECT deployments.*
    FROM deployments
    WHERE deployments.environment_id = 5
    AND deployments.iid = 225
    AND deployments.project_id = 1292351;

    Index Scan using index_deployments_on_project_id_and_iid on deployments  (cost=0.42..4.45 rows=1 width=117) (actual time=0.018..0.018 rows=1 loops=1)
      Index Cond: ((project_id = 1292351) AND (iid = 225))
      Filter: (environment_id = 5)
      Buffers: shared hit=4
    Planning time: 0.088 ms
    Execution time: 0.039 ms

On GitLab.com these changes result in a (roughly) 11x improvement in SQL
timings for the CI environment status endpoint.

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/36877

Do not use `location.pathname` when accessing environments folders

See merge request !2147

So that whenever we want to reserve more, we're aware,
and don't mess it up.

This is allowed for existing instances so we don't end up 76 offenses
right away, but for new code one should _only_ use this if they _have_
to remove non database data. Even then it's usually better to do this in
a service class as this gives you more control over how to remove the
data (e.g. in bulk).

As its hard to reliably check how many review apps there are on the
clients machine, we start by checking where the type is `review`. This
means the folder is called that way. This will lead to a seq
scan on the table. However, this is done once a week, so the benefit of
adding an index seems not to apply here.

Fixes gitlab-org/gitlab-ce#33106

Additional metrics initial work, with working metrics listing, but without actoual metrics mesurements

For the index view, the environments can now be requested every 15
seconds. Any transition state of a projects environments will trigger a
cache invalidation action.

Fixes gitlab-org/gitlab-ce#31701

For the index view, the environments can now be requested every 15
seconds. Any transition state of a projects environments will trigger a
cache invalidation action.

Fixes gitlab-org/gitlab-ce#31701

- Tests for prometheus queries

- fix rubocop warnings

- Remove unused method. Add more queries to deployment queries.

- Wrap BaseQuery in module hierarchy

Renname Prometheus class to PrometheusClient

Use the EnforcedStyleForMultiline: no_comma option.

Signed-off-by: Rémy Coutable <remy@rymai.me>