diff --git a/CHANGELOG.md b/CHANGELOG.md
index e9326585e88..799fdda0441 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 documentation](doc/development/changelog.md) for instructions on adding your own
 entry.
 
+## 16.3.3 (2023-09-12)
+
+### Fixed (2 changes)
+
+- [Prevent pipeline creation while import is running](gitlab-org/gitlab@b4e374ed7f5b264f04a2589a99004e568ef92319) ([merge request](gitlab-org/gitlab!131156))
+- [Create iid sequence for ci_pipelines with new projects](gitlab-org/gitlab@a74b9ac352e0d9783ec39adaadbe2b65028f8e0c) ([merge request](gitlab-org/gitlab!130835))
+
 ## 16.3.2 (2023-09-05)
 
 ### Fixed (2 changes)
@@ -818,6 +825,14 @@ entry.
 - [Fix test pollution in count_deployments_metric_spec](gitlab-org/gitlab@610e6a033fe9b20aabc237b18837cddf150d4d1b) ([merge request](gitlab-org/gitlab!126808))
 - [Update BulkImports::PipelineBatchWorker resource boundary](gitlab-org/gitlab@7d2477d81bcc2d035be26587802706f7098b6e44) ([merge request](gitlab-org/gitlab!126696))
 
+## 16.2.6 (2023-09-12)
+
+### Fixed (3 changes)
+
+- [Prevent pipeline creation while import is running](gitlab-org/gitlab@457561758ed262b3958ff202f31a3f4d1098e983) ([merge request](gitlab-org/gitlab!131155))
+- [Create iid sequence for ci_pipelines with new projects](gitlab-org/gitlab@386708854a916b28154535bf76777526ffb78a31) ([merge request](gitlab-org/gitlab!130836))
+- [Drop bridge jobs on unknown failures](gitlab-org/gitlab@0cf3c9c5fc59bf6a8ea66d6017b33960c109852f) ([merge request](gitlab-org/gitlab!130834))
+
 ## 16.2.5 (2023-08-31)
 
 ### Fixed (1 change)
diff --git a/app/assets/javascripts/feature_flags/components/new_environments_dropdown.vue b/app/assets/javascripts/feature_flags/components/new_environments_dropdown.vue
index 420c34a88f1..ad80ee099ad 100644
--- a/app/assets/javascripts/feature_flags/components/new_environments_dropdown.vue
+++ b/app/assets/javascripts/feature_flags/components/new_environments_dropdown.vue
@@ -1,25 +1,15 @@
 <script>
-import {
-  GlDropdown,
-  GlDropdownDivider,
-  GlDropdownItem,
-  GlIcon,
-  GlLoadingIcon,
-  GlSearchBoxByType,
-} from '@gitlab/ui';
-import { debounce } from 'lodash';
+import { GlCollapsibleListbox, GlButton } from '@gitlab/ui';
+import { debounce, memoize } from 'lodash';
 import { createAlert } from '~/alert';
 import axios from '~/lib/utils/axios_utils';
-import { __, sprintf } from '~/locale';
+import { __, n__, sprintf } from '~/locale';
+import { DEFAULT_DEBOUNCE_AND_THROTTLE_MS } from '~/lib/utils/constants';
 
 export default {
   components: {
-    GlDropdown,
-    GlDropdownDivider,
-    GlDropdownItem,
-    GlSearchBoxByType,
-    GlIcon,
-    GlLoadingIcon,
+    GlButton,
+    GlCollapsibleListbox,
   },
   inject: ['environmentsEndpoint'],
   data() {
@@ -34,69 +24,96 @@ export default {
     noResultsLabel: __('No matching results'),
   },
   computed: {
+    srOnlyResultsCount() {
+      return n__('%d environment found', '%d environments found', this.results.length);
+    },
     createEnvironmentLabel() {
       return sprintf(__('Create %{environment}'), { environment: this.environmentSearch });
     },
-  },
-  methods: {
-    addEnvironment(newEnvironment) {
-      this.$emit('add', newEnvironment);
-      this.environmentSearch = '';
-      this.results = [];
+    isCreateEnvironmentShown() {
+      return !this.isLoading && this.results.length === 0 && Boolean(this.environmentSearch);
     },
-    fetchEnvironments: debounce(function debouncedFetchEnvironments() {
+  },
+  mounted() {
+    this.fetchEnvironments();
+  },
+  unmounted() {
+    // cancel debounce if the component is unmounted to avoid unnecessary fetches
+    this.fetchEnvironments.cancel();
+  },
+  created() {
+    this.fetch = memoize(async function fetchEnvironmentsFromApi(query) {
       this.isLoading = true;
-      axios
-        .get(this.environmentsEndpoint, { params: { query: this.environmentSearch } })
-        .then(({ data }) => {
-          this.results = data || [];
+      try {
+        const { data } = await axios.get(this.environmentsEndpoint, { params: { query } });
+
+        return data;
+      } catch {
+        createAlert({
+          message: __('Something went wrong on our end. Please try again.'),
+        });
+        return [];
+      } finally {
+        this.isLoading = false;
+      }
+    });
+
+    this.fetchEnvironments = debounce(function debouncedFetchEnvironments(query = '') {
+      this.fetch(query)
+        .then((data) => {
+          this.results = data.map((item) => ({ text: item, value: item }));
         })
         .catch(() => {
-          createAlert({
-            message: __('Something went wrong on our end. Please try again.'),
-          });
-        })
-        .finally(() => {
-          this.isLoading = false;
+          this.results = [];
         });
-    }, 250),
-    setFocus() {
-      this.$refs.searchBox.focusInput();
+    }, DEFAULT_DEBOUNCE_AND_THROTTLE_MS);
+  },
+  methods: {
+    onSelect(selected) {
+      this.$emit('add', selected[0]);
+    },
+    addEnvironment(newEnvironment) {
+      this.$emit('add', newEnvironment);
+      this.results = [];
+    },
+    onSearch(query) {
+      this.environmentSearch = query;
+      this.fetchEnvironments(query);
     },
   },
 };
 </script>
 <template>
-  <gl-dropdown class="js-new-environments-dropdown" @shown="setFocus">
-    <template #button-content>
-      <span class="d-md-none mr-1">
-        {{ $options.translations.addEnvironmentsLabel }}
-      </span>
-      <gl-icon class="d-none d-md-inline-flex gl-mr-1" name="plus" />
+  <gl-collapsible-listbox
+    icon="plus"
+    data-testid="new-environments-dropdown"
+    :toggle-text="$options.translations.addEnvironmentsLabel"
+    :items="results"
+    :searching="isLoading"
+    :header-text="$options.translations.addEnvironmentsLabel"
+    searchable
+    multiple
+    @search="onSearch"
+    @select="onSelect"
+  >
+    <template #footer>
+      <div
+        v-if="isCreateEnvironmentShown"
+        class="gl-border-t-solid gl-border-t-1 gl-border-t-gray-200 gl-p-2"
+      >
+        <gl-button
+          category="tertiary"
+          block
+          class="gl-justify-content-start!"
+          data-testid="add-environment-button"
+          @click="addEnvironment(environmentSearch)"
+        >
+          {{ createEnvironmentLabel }}
+        </gl-button>
+      </div>
     </template>
-    <gl-search-box-by-type
-      ref="searchBox"
-      v-model.trim="environmentSearch"
-      @focus="fetchEnvironments"
-      @keyup="fetchEnvironments"
-    />
-    <gl-loading-icon v-if="isLoading" size="sm" />
-    <gl-dropdown-item
-      v-for="environment in results"
-      v-else-if="results.length"
-      :key="environment"
-      @click="addEnvironment(environment)"
-    >
-      {{ environment }}
-    </gl-dropdown-item>
-    <template v-else-if="environmentSearch.length">
-      <span ref="noResults" class="text-secondary gl-p-3">
-        {{ $options.translations.noMatchingResults }}
-      </span>
-      <gl-dropdown-divider />
-      <gl-dropdown-item @click="addEnvironment(environmentSearch)">
-        {{ createEnvironmentLabel }}
-      </gl-dropdown-item>
+    <template #search-summary-sr-only>
+      {{ srOnlyResultsCount }}
     </template>
-  </gl-dropdown>
+  </gl-collapsible-listbox>
 </template>
diff --git a/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue b/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue
index c7b18886cb9..27bdcc69120 100644
--- a/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue
+++ b/app/assets/javascripts/vue_shared/components/blob_viewers/rich_viewer.vue
@@ -77,6 +77,7 @@ export default {
 
       if (!this.isMarkup || !this.remainingContent.length) {
         this.$emit(CONTENT_LOADED_EVENT);
+        this.isLoading = false;
         return;
       }
 
@@ -89,6 +90,7 @@ export default {
           fileContent.append(...content);
           if (nextChunkEnd < this.remainingContent.length) return;
           this.$emit(CONTENT_LOADED_EVENT);
+          this.isLoading = false;
         }, i);
       }
     },
@@ -99,5 +101,9 @@ export default {
 };
 </script>
 <template>
-  <markdown-field-view ref="content" v-safe-html:[$options.safeHtmlConfig]="rawContent" />
+  <markdown-field-view
+    ref="content"
+    v-safe-html:[$options.safeHtmlConfig]="rawContent"
+    :is-loading="isLoading"
+  />
 </template>
diff --git a/app/assets/javascripts/vue_shared/components/markdown/field_view.vue b/app/assets/javascripts/vue_shared/components/markdown/field_view.vue
index 84d40db07bb..c70197c6715 100644
--- a/app/assets/javascripts/vue_shared/components/markdown/field_view.vue
+++ b/app/assets/javascripts/vue_shared/components/markdown/field_view.vue
@@ -2,8 +2,26 @@
 import { renderGFM } from '~/behaviors/markdown/render_gfm';
 
 export default {
+  props: {
+    isLoading: {
+      type: Boolean,
+      required: false,
+      default: false,
+    },
+  },
+  watch: {
+    isLoading() {
+      this.handleGFM();
+    },
+  },
   mounted() {
-    renderGFM(this.$el);
+    this.handleGFM();
+  },
+  methods: {
+    handleGFM() {
+      if (this.isLoading) return;
+      renderGFM(this.$el);
+    },
   },
 };
 </script>
diff --git a/app/graphql/types/ci/job_type.rb b/app/graphql/types/ci/job_type.rb
index 490ab397d46..5956d372fe4 100644
--- a/app/graphql/types/ci/job_type.rb
+++ b/app/graphql/types/ci/job_type.rb
@@ -88,10 +88,14 @@ module Types
                                                 description: 'Play path of the job.'
       field :playable, GraphQL::Types::Boolean, null: false, method: :playable?,
                                                 description: 'Indicates the job can be played.'
+      field :previous_stage_jobs, Types::Ci::JobType.connection_type,
+            null: true,
+            description: 'Jobs from the previous stage.'
       field :previous_stage_jobs_or_needs, Types::Ci::JobNeedUnion.connection_type,
             null: true,
             description: 'Jobs that must complete before the job runs. Returns `BuildNeed`, ' \
-                         'which is the needed jobs if the job uses the `needs` keyword, or the previous stage jobs otherwise.'
+                         'which is the needed jobs if the job uses the `needs` keyword, or the previous stage jobs otherwise.',
+            deprecated: { reason: 'Replaced by previousStageJobs and needs fields', milestone: '16.4' }
       field :ref_name, GraphQL::Types::String, null: true,
                                                description: 'Ref name of the job.'
       field :ref_path, GraphQL::Types::String, null: true,
@@ -176,17 +180,17 @@ module Types
       end
 
       def previous_stage_jobs
-        BatchLoader::GraphQL.for([object.pipeline, object.stage_idx - 1]).batch(default_value: []) do |tuples, loader|
-          tuples.group_by(&:first).each do |pipeline, keys|
-            positions = keys.map(&:second)
+        BatchLoader::GraphQL.for([object.pipeline_id, object.stage_idx - 1]).batch(default_value: []) do |tuples, loader|
+          pipeline_ids = tuples.map(&:first).uniq
+          stage_idxs = tuples.map(&:second).uniq
 
-            stages = pipeline.stages.by_position(positions)
+          # This query can fetch unneeded jobs when querying for more than one pipeline.
+          # It was decided that fetching and discarding the jobs is preferable to making a more complex query.
+          jobs = CommitStatus.in_pipelines(pipeline_ids).for_stage(stage_idxs).latest
+          grouped_jobs = jobs.group_by { |job| [job.pipeline_id, job.stage_idx] }
 
-            stages.each do |stage|
-              # Without `.to_a`, the memoization will only preserve the activerecord relation object. And when there is
-              # a call, the SQL query will be executed again.
-              loader.call([pipeline, stage.position], stage.latest_statuses.to_a)
-            end
+          tuples.each do |tuple|
+            loader.call(tuple, grouped_jobs.fetch(tuple, []))
           end
         end
       end
diff --git a/app/models/concerns/issuable.rb b/app/models/concerns/issuable.rb
index 32e6b20f512..a9a00ab1c44 100644
--- a/app/models/concerns/issuable.rb
+++ b/app/models/concerns/issuable.rb
@@ -19,6 +19,7 @@ module Issuable
   include Awardable
   include Taskable
   include Importable
+  include Transitionable
   include Editable
   include AfterCommitQueue
   include Sortable
@@ -239,6 +240,10 @@ module Issuable
       super + [:notes]
     end
 
+    def importing_or_transitioning?
+      importing? || transitioning?
+    end
+
     private
 
     def validate_description_length?
diff --git a/app/models/concerns/transitionable.rb b/app/models/concerns/transitionable.rb
new file mode 100644
index 00000000000..70e1fc8b78a
--- /dev/null
+++ b/app/models/concerns/transitionable.rb
@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+module Transitionable
+  extend ActiveSupport::Concern
+
+  attr_accessor :transitioning
+
+  def transitioning?
+    return false unless transitioning && Feature.enabled?(:skip_validations_during_transitions, project)
+
+    true
+  end
+
+  def enable_transitioning
+    self.transitioning = true
+  end
+
+  def disable_transitioning
+    self.transitioning = false
+  end
+end
diff --git a/app/models/merge_request.rb b/app/models/merge_request.rb
index 13dd221ee2b..5edbddc8c49 100644
--- a/app/models/merge_request.rb
+++ b/app/models/merge_request.rb
@@ -279,6 +279,12 @@ class MergeRequest < ApplicationRecord
     def check_state?(merge_status)
       [:unchecked, :cannot_be_merged_recheck, :checking, :cannot_be_merged_rechecking].include?(merge_status.to_sym)
     end
+
+    # rubocop: disable Style/SymbolProc
+    before_transition { |merge_request| merge_request.enable_transitioning }
+
+    after_transition { |merge_request| merge_request.disable_transitioning }
+    # rubocop: enable Style/SymbolProc
   end
 
   # Returns current merge_status except it returns `cannot_be_merged_rechecking` as `checking`
@@ -292,10 +298,14 @@ class MergeRequest < ApplicationRecord
   validates :target_project, presence: true
   validates :target_branch, presence: true
   validates :merge_user, presence: true, if: :auto_merge_enabled?, unless: :importing?
-  validate :validate_branches, unless: [:allow_broken, :importing?, :closed_or_merged_without_fork?]
+  validate :validate_branches, unless: [
+    :allow_broken,
+    :importing_or_transitioning?,
+    :closed_or_merged_without_fork?
+  ]
   validate :validate_fork, unless: :closed_or_merged_without_fork?
-  validate :validate_target_project, on: :create, unless: :importing?
-  validate :validate_reviewer_size_length, unless: :importing?
+  validate :validate_target_project, on: :create, unless: :importing_or_transitioning?
+  validate :validate_reviewer_size_length, unless: :importing_or_transitioning?
 
   scope :by_source_or_target_branch, ->(branch_name) do
     where("source_branch = :branch OR target_branch = :branch", branch: branch_name)
diff --git a/app/models/performance_monitoring/prometheus_metric.rb b/app/models/performance_monitoring/prometheus_metric.rb
deleted file mode 100644
index d67b1809d93..00000000000
--- a/app/models/performance_monitoring/prometheus_metric.rb
+++ /dev/null
@@ -1,33 +0,0 @@
-# frozen_string_literal: true
-
-module PerformanceMonitoring
-  class PrometheusMetric
-    include ActiveModel::Model
-
-    attr_accessor :id, :unit, :label, :query, :query_range
-
-    validates :unit, presence: true
-    validates :query, presence: true, unless: :query_range
-    validates :query_range, presence: true, unless: :query
-
-    class << self
-      def from_json(json_content)
-        build_from_hash(json_content).tap(&:validate!)
-      end
-
-      private
-
-      def build_from_hash(attributes)
-        return new unless attributes.is_a?(Hash)
-
-        new(
-          id: attributes['id'],
-          unit: attributes['unit'],
-          label: attributes['label'],
-          query: attributes['query'],
-          query_range: attributes['query_range']
-        )
-      end
-    end
-  end
-end
diff --git a/app/models/performance_monitoring/prometheus_panel.rb b/app/models/performance_monitoring/prometheus_panel.rb
deleted file mode 100644
index b33c09001ae..00000000000
--- a/app/models/performance_monitoring/prometheus_panel.rb
+++ /dev/null
@@ -1,42 +0,0 @@
-# frozen_string_literal: true
-
-module PerformanceMonitoring
-  class PrometheusPanel
-    include ActiveModel::Model
-
-    attr_accessor :type, :title, :y_label, :weight, :metrics, :y_axis, :max_value
-
-    validates :title, presence: true
-    validates :metrics, array_members: { member_class: PerformanceMonitoring::PrometheusMetric }
-
-    class << self
-      def from_json(json_content)
-        build_from_hash(json_content).tap(&:validate!)
-      end
-
-      private
-
-      def build_from_hash(attributes)
-        return new unless attributes.is_a?(Hash)
-
-        new(
-          type: attributes['type'],
-          title: attributes['title'],
-          y_label: attributes['y_label'],
-          weight: attributes['weight'],
-          metrics: initialize_children_collection(attributes['metrics'])
-        )
-      end
-
-      def initialize_children_collection(children)
-        return unless children.is_a?(Array)
-
-        children.map { |metrics| PerformanceMonitoring::PrometheusMetric.from_json(metrics) }
-      end
-    end
-
-    def id(group_title)
-      Digest::SHA2.hexdigest([group_title, type, title].join)
-    end
-  end
-end
diff --git a/config/feature_flags/development/skip_validations_during_transitions.yml b/config/feature_flags/development/skip_validations_during_transitions.yml
new file mode 100644
index 00000000000..53cf5f5ee71
--- /dev/null
+++ b/config/feature_flags/development/skip_validations_during_transitions.yml
@@ -0,0 +1,8 @@
+---
+name: skip_validations_during_transitions
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/129848
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/423092
+milestone: '16.4'
+type: development
+group: group::code review
+default_enabled: false
diff --git a/doc/api/graphql/reference/index.md b/doc/api/graphql/reference/index.md
index 70a22061ed0..b3aebb0a30a 100644
--- a/doc/api/graphql/reference/index.md
+++ b/doc/api/graphql/reference/index.md
@@ -204,6 +204,24 @@ Returns [`CiStage`](#cistage).
 | ---- | ---- | ----------- |
 | <a id="querycipipelinestageid"></a>`id` | [`CiStageID!`](#cistageid) | Global ID of the CI stage. |
 
+### `Query.ciQueueingHistory`
+
+Time it took for ci job to be picked up by runner in percentiles.
+
+WARNING:
+**Introduced** in 16.4.
+This feature is an Experiment. It can be changed or removed at any time.
+
+Returns [`QueueingDelayHistory`](#queueingdelayhistory).
+
+#### Arguments
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| <a id="queryciqueueinghistoryfromtime"></a>`fromTime` | [`Time`](#time) | Start of the requested time frame. Defaults to 3 hours ago. |
+| <a id="queryciqueueinghistoryrunnertype"></a>`runnerType` | [`CiRunnerType`](#cirunnertype) | Filter jobs by the type of runner that executed them. |
+| <a id="queryciqueueinghistorytotime"></a>`toTime` | [`Time`](#time) | End of the requested time frame. Defaults to current time. |
+
 ### `Query.ciVariables`
 
 List of the instance's CI/CD variables.
@@ -13863,7 +13881,8 @@ CI/CD variables for a GitLab instance.
 | <a id="cijobpipeline"></a>`pipeline` | [`Pipeline`](#pipeline) | Pipeline the job belongs to. |
 | <a id="cijobplaypath"></a>`playPath` | [`String`](#string) | Play path of the job. |
 | <a id="cijobplayable"></a>`playable` | [`Boolean!`](#boolean) | Indicates the job can be played. |
-| <a id="cijobpreviousstagejobsorneeds"></a>`previousStageJobsOrNeeds` | [`JobNeedUnionConnection`](#jobneedunionconnection) | Jobs that must complete before the job runs. Returns `BuildNeed`, which is the needed jobs if the job uses the `needs` keyword, or the previous stage jobs otherwise. (see [Connections](#connections)) |
+| <a id="cijobpreviousstagejobs"></a>`previousStageJobs` | [`CiJobConnection`](#cijobconnection) | Jobs from the previous stage. (see [Connections](#connections)) |
+| <a id="cijobpreviousstagejobsorneeds"></a>`previousStageJobsOrNeeds` **{warning-solid}** | [`JobNeedUnionConnection`](#jobneedunionconnection) | **Deprecated** in 16.4. Replaced by previousStageJobs and needs fields. |
 | <a id="cijobproject"></a>`project` | [`Project`](#project) | Project that the job belongs to. |
 | <a id="cijobqueuedat"></a>`queuedAt` | [`Time`](#time) | When the job was enqueued and marked as pending. |
 | <a id="cijobqueuedduration"></a>`queuedDuration` | [`Duration`](#duration) | How long the job was enqueued before starting. |
@@ -23200,6 +23219,31 @@ Pypi metadata.
 | <a id="querycomplexitylimit"></a>`limit` | [`Int`](#int) | GraphQL query complexity limit. See [GitLab documentation on this limit](https://docs.gitlab.com/ee/api/graphql/index.html#max-query-complexity). |
 | <a id="querycomplexityscore"></a>`score` | [`Int`](#int) | GraphQL query complexity score. |
 
+### `QueueingDelayHistory`
+
+Aggregated statistics about queueing times for CI jobs.
+
+#### Fields
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| <a id="queueingdelayhistorytimeseries"></a>`timeSeries` | [`[QueueingHistoryTimeSeries!]`](#queueinghistorytimeseries) | Time series. |
+
+### `QueueingHistoryTimeSeries`
+
+The amount of time for a job to be picked up by a runner, in percentiles.
+
+#### Fields
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| <a id="queueinghistorytimeseriesp25"></a>`p25` **{warning-solid}** | [`Duration`](#duration) | **Introduced** in 16.4. This feature is an Experiment. It can be changed or removed at any time. 25th percentile. 25% of the durations are lower than this value. |
+| <a id="queueinghistorytimeseriesp50"></a>`p50` **{warning-solid}** | [`Duration`](#duration) | **Introduced** in 16.4. This feature is an Experiment. It can be changed or removed at any time. 50th percentile. 50% of the durations are lower than this value. |
+| <a id="queueinghistorytimeseriesp90"></a>`p90` **{warning-solid}** | [`Duration`](#duration) | **Introduced** in 16.4. This feature is an Experiment. It can be changed or removed at any time. 90th percentile. 90% of the durations are lower than this value. |
+| <a id="queueinghistorytimeseriesp95"></a>`p95` **{warning-solid}** | [`Duration`](#duration) | **Introduced** in 16.4. This feature is an Experiment. It can be changed or removed at any time. 95th percentile. 95% of the durations are lower than this value. |
+| <a id="queueinghistorytimeseriesp99"></a>`p99` **{warning-solid}** | [`Duration`](#duration) | **Introduced** in 16.4. This feature is an Experiment. It can be changed or removed at any time. 99th percentile. 99% of the durations are lower than this value. |
+| <a id="queueinghistorytimeseriestime"></a>`time` | [`Time!`](#time) | Start of the time interval. |
+
 ### `RecentFailures`
 
 Recent failure history of a test case.
diff --git a/doc/api/tags.md b/doc/api/tags.md
index d85b24639bb..4cc6c80bf20 100644
--- a/doc/api/tags.md
+++ b/doc/api/tags.md
@@ -11,7 +11,10 @@ info: To determine the technical writer assigned to the Stage/Group associated w
 > `version` value for the `order_by` attribute [introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/95150) in GitLab 15.4.
 
 Get a list of repository tags from a project, sorted by update date and time in
-descending order. If the repository is publicly accessible, authentication
+descending order.
+
+NOTE:
+If the repository is publicly accessible, authentication
 (`--header "PRIVATE-TOKEN: <your_access_token>"`) is not required.
 
 ```plaintext
@@ -27,6 +30,13 @@ Parameters:
 | `sort`     | string            | no       | Return tags sorted in `asc` or `desc` order. Default is `desc`. |
 | `search`   | string            | no       | Return a list of tags matching the search criteria. You can use `^term` and `term$` to find tags that begin and end with `term` respectively. No other regular expressions are supported. |
 
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" \
+    --url "https://gitlab.example.com/api/v4/projects/5/repository/tags"
+```
+
+Example Response:
+
 ```json
 [
   {
diff --git a/doc/integration/saml.md b/doc/integration/saml.md
index 5e70a27e52a..7af1dbeeff8 100644
--- a/doc/integration/saml.md
+++ b/doc/integration/saml.md
@@ -116,7 +116,7 @@ For more information on:
        omniauth:
          enabled: true
          allowSingleSignOn: ['saml']
-         blockAutoCreatedUsers: true
+         blockAutoCreatedUsers: false
    ```
 
 1. Optional. You can automatically link SAML users with existing GitLab users if their
diff --git a/lib/gitlab/prometheus/additional_metrics_parser.rb b/lib/gitlab/prometheus/additional_metrics_parser.rb
deleted file mode 100644
index f5eb27b6916..00000000000
--- a/lib/gitlab/prometheus/additional_metrics_parser.rb
+++ /dev/null
@@ -1,45 +0,0 @@
-# frozen_string_literal: true
-
-module Gitlab
-  module Prometheus
-    module AdditionalMetricsParser
-      CONFIG_ROOT = 'config/prometheus'
-      MUTEX = Mutex.new
-      extend self
-
-      def load_groups_from_yaml(file_name)
-        yaml_metrics_raw(file_name).map(&method(:group_from_entry))
-      end
-
-      private
-
-      def validate!(obj)
-        raise ParsingError, obj.errors.full_messages.join('\n') unless obj.valid?
-      end
-
-      def group_from_entry(entry)
-        entry[:name] = entry.delete(:group)
-        entry[:metrics]&.map! do |entry|
-          Metric.new(entry).tap(&method(:validate!))
-        end
-
-        MetricGroup.new(entry).tap(&method(:validate!))
-      end
-
-      def yaml_metrics_raw(file_name)
-        load_yaml_file(file_name)&.map(&:deep_symbolize_keys).freeze
-      end
-
-      # rubocop:disable Gitlab/ModuleWithInstanceVariables
-      def load_yaml_file(file_name)
-        return YAML.load_file(Rails.root.join(CONFIG_ROOT, file_name)) if Rails.env.development?
-
-        MUTEX.synchronize do
-          @loaded_yaml_cache ||= {}
-          @loaded_yaml_cache[file_name] ||= YAML.load_file(Rails.root.join(CONFIG_ROOT, file_name))
-        end
-      end
-      # rubocop:enable Gitlab/ModuleWithInstanceVariables
-    end
-  end
-end
diff --git a/locale/gitlab.pot b/locale/gitlab.pot
index 508e3acb4d6..dadc8742070 100644
--- a/locale/gitlab.pot
+++ b/locale/gitlab.pot
@@ -252,6 +252,11 @@ msgid_plural "%d days"
 msgstr[0] ""
 msgstr[1] ""
 
+msgid "%d environment found"
+msgid_plural "%d environments found"
+msgstr[0] ""
+msgstr[1] ""
+
 msgid "%d epic"
 msgid_plural "%d epics"
 msgstr[0] ""
diff --git a/qa/qa/service/cluster_provider/gcloud.rb b/qa/qa/service/cluster_provider/gcloud.rb
index 4976a8d8dad..7993cf4ab4d 100644
--- a/qa/qa/service/cluster_provider/gcloud.rb
+++ b/qa/qa/service/cluster_provider/gcloud.rb
@@ -45,7 +45,7 @@ module QA
         end
 
         def install_kubernetes_agent(agent_token:, kas_address:, agent_name: "gitlab-agent")
-          shell <<~CMD.tr("\n", ' ')
+          cmd_str = <<~CMD.tr("\n", ' ')
             helm repo add gitlab https://charts.gitlab.io &&
             helm repo update &&
             helm upgrade --install gitlab-agent gitlab/gitlab-agent
@@ -56,6 +56,7 @@ module QA
               --set config.kasAddress=#{kas_address}
               --set config.kasHeaders="{Cookie: gitlab_canary=#{target_canary?}}"
           CMD
+          shell(cmd_str, mask_secrets: [agent_token])
         end
 
         def uninstall_kubernetes_agent(agent_name: "gitlab-agent")
@@ -78,7 +79,7 @@ module QA
         end
 
         def install_gitlab_workspaces_proxy
-          shell <<~CMD.tr("\n", ' ')
+          cmd_str = <<~CMD.tr("\n", ' ')
             helm repo add gitlab-workspaces-proxy \
               https://gitlab.com/api/v4/projects/gitlab-org%2fremote-development%2fgitlab-workspaces-proxy/packages/helm/devel &&
             helm repo update &&
@@ -100,6 +101,8 @@ module QA
               --set="ingress.tls.wildcardDomainKey=$(cat #{Runtime::Env.workspaces_wildcard_key})" \
               --set="ingress.className=nginx"
           CMD
+
+          shell(cmd_str, mask_secrets: [Runtime::Env.workspaces_oauth_app_secret, Runtime::Env.workspaces_oauth_signing_key])
         end
 
         def update_dns(load_balancer_ip)
diff --git a/spec/features/projects/feature_flags/user_creates_feature_flag_spec.rb b/spec/features/projects/feature_flags/user_creates_feature_flag_spec.rb
index 4af5c91479a..127610cf4db 100644
--- a/spec/features/projects/feature_flags/user_creates_feature_flag_spec.rb
+++ b/spec/features/projects/feature_flags/user_creates_feature_flag_spec.rb
@@ -7,13 +7,14 @@ RSpec.describe 'User creates feature flag', :js do
 
   let(:user) { create(:user) }
   let(:project) { create(:project, namespace: user.namespace) }
+  let!(:environment) { create(:environment, :production, project: project) }
 
   before do
     project.add_developer(user)
     sign_in(user)
   end
 
-  it 'user creates a flag enabled for user ids' do
+  it 'user creates a flag enabled for user ids with existing environment' do
     visit(new_project_feature_flag_path(project))
     set_feature_flag_info('test_feature', 'Test feature')
     within_strategy_row(1) do
@@ -29,6 +30,22 @@ RSpec.describe 'User creates feature flag', :js do
     expect(page).to have_text('test_feature')
   end
 
+  it 'user creates a flag enabled for user ids with non-existing environment' do
+    visit(new_project_feature_flag_path(project))
+    set_feature_flag_info('test_feature', 'Test feature')
+    within_strategy_row(1) do
+      select 'User IDs', from: 'Type'
+      fill_in 'User IDs', with: 'user1, user2'
+      environment_plus_button.click
+      environment_search_input.set('foo-bar')
+      environment_search_create_button.first.click
+    end
+    click_button 'Create feature flag'
+
+    expect_user_to_see_feature_flags_index_page
+    expect(page).to have_text('test_feature')
+  end
+
   it 'user creates a flag with default environment scopes' do
     visit(new_project_feature_flag_path(project))
     set_feature_flag_info('test_flag', 'Test flag')
@@ -74,14 +91,18 @@ RSpec.describe 'User creates feature flag', :js do
   end
 
   def environment_plus_button
-    find('.js-new-environments-dropdown')
+    find('[data-testid=new-environments-dropdown]')
   end
 
   def environment_search_input
-    find('.js-new-environments-dropdown input')
+    find('[data-testid=new-environments-dropdown] input')
   end
 
   def environment_search_results
-    all('.js-new-environments-dropdown button.dropdown-item')
+    all('[data-testid=new-environments-dropdown] li')
+  end
+
+  def environment_search_create_button
+    all('[data-testid=new-environments-dropdown] button')
   end
 end
diff --git a/spec/frontend/feature_flags/components/new_environments_dropdown_spec.js b/spec/frontend/feature_flags/components/new_environments_dropdown_spec.js
index 6156addd63f..b503a6f829e 100644
--- a/spec/frontend/feature_flags/components/new_environments_dropdown_spec.js
+++ b/spec/frontend/feature_flags/components/new_environments_dropdown_spec.js
@@ -1,7 +1,6 @@
-import { GlLoadingIcon, GlSearchBoxByType, GlDropdownItem } from '@gitlab/ui';
-import { shallowMount } from '@vue/test-utils';
+import { GlCollapsibleListbox } from '@gitlab/ui';
 import MockAdapter from 'axios-mock-adapter';
-import { nextTick } from 'vue';
+import { shallowMountExtended } from 'helpers/vue_test_utils_helper';
 import NewEnvironmentsDropdown from '~/feature_flags/components/new_environments_dropdown.vue';
 import axios from '~/lib/utils/axios_utils';
 import { HTTP_STATUS_OK } from '~/lib/utils/http_status';
@@ -13,87 +12,78 @@ describe('New Environments Dropdown', () => {
   let wrapper;
   let axiosMock;
 
-  beforeEach(() => {
+  const createWrapper = (axiosResult = []) => {
     axiosMock = new MockAdapter(axios);
-    wrapper = shallowMount(NewEnvironmentsDropdown, {
+    axiosMock.onGet(TEST_HOST).reply(HTTP_STATUS_OK, axiosResult);
+
+    wrapper = shallowMountExtended(NewEnvironmentsDropdown, {
       provide: { environmentsEndpoint: TEST_HOST },
+      stubs: {
+        GlCollapsibleListbox,
+      },
     });
-  });
+  };
+
+  const findListbox = () => wrapper.findComponent(GlCollapsibleListbox);
+  const findCreateEnvironmentButton = () => wrapper.findByTestId('add-environment-button');
 
   afterEach(() => {
     axiosMock.restore();
   });
 
   describe('before results', () => {
+    beforeEach(() => {
+      createWrapper();
+    });
+
     it('should show a loading icon', () => {
-      axiosMock.onGet(TEST_HOST).reply(() => {
-        expect(wrapper.findComponent(GlLoadingIcon).exists()).toBe(true);
-      });
-      wrapper.findComponent(GlSearchBoxByType).vm.$emit('focus');
-      return axios.waitForAll();
+      expect(findListbox().props('searching')).toBe(true);
     });
 
     it('should not show any dropdown items', () => {
-      axiosMock.onGet(TEST_HOST).reply(() => {
-        expect(wrapper.findAllComponents(GlDropdownItem)).toHaveLength(0);
-      });
-      wrapper.findComponent(GlSearchBoxByType).vm.$emit('focus');
-      return axios.waitForAll();
+      expect(findListbox().props('items')).toEqual([]);
     });
   });
 
   describe('with empty results', () => {
-    let item;
     beforeEach(async () => {
-      axiosMock.onGet(TEST_HOST).reply(HTTP_STATUS_OK, []);
-      wrapper.findComponent(GlSearchBoxByType).vm.$emit('focus');
-      wrapper.findComponent(GlSearchBoxByType).vm.$emit('input', TEST_SEARCH);
+      createWrapper();
+      findListbox().vm.$emit('search', TEST_SEARCH);
       await axios.waitForAll();
-      await nextTick();
-      item = wrapper.findComponent(GlDropdownItem);
     });
 
     it('should display a Create item label', () => {
-      expect(item.text()).toBe('Create production');
-    });
-
-    it('should display that no matching items are found', () => {
-      expect(wrapper.findComponent({ ref: 'noResults' }).exists()).toBe(true);
+      expect(findCreateEnvironmentButton().text()).toBe(`Create ${TEST_SEARCH}`);
     });
 
     it('should emit a new scope when selected', () => {
-      item.vm.$emit('click');
+      findCreateEnvironmentButton().vm.$emit('click');
       expect(wrapper.emitted('add')).toEqual([[TEST_SEARCH]]);
     });
   });
 
   describe('with results', () => {
-    let items;
-    beforeEach(() => {
-      axiosMock.onGet(TEST_HOST).reply(HTTP_STATUS_OK, ['prod', 'production']);
-      wrapper.findComponent(GlSearchBoxByType).vm.$emit('focus');
-      wrapper.findComponent(GlSearchBoxByType).vm.$emit('input', 'prod');
-      return axios.waitForAll().then(() => {
-        items = wrapper.findAllComponents(GlDropdownItem);
-      });
+    beforeEach(async () => {
+      createWrapper(['prod', 'production']);
+      findListbox().vm.$emit('search', TEST_SEARCH);
+      await axios.waitForAll();
     });
 
-    it('should display one item per result', () => {
-      expect(items).toHaveLength(2);
+    it('should populate results properly', () => {
+      expect(findListbox().props().items).toHaveLength(2);
     });
 
-    it('should emit an add if an item is clicked', () => {
-      items.at(0).vm.$emit('click');
+    it('should emit an add on selection', () => {
+      findListbox().vm.$emit('select', ['prod']);
       expect(wrapper.emitted('add')).toEqual([['prod']]);
     });
 
-    it('should not display a create label', () => {
-      items = items.filter((i) => i.text().startsWith('Create'));
-      expect(items).toHaveLength(0);
-    });
-
     it('should not display a message about no results', () => {
       expect(wrapper.findComponent({ ref: 'noResults' }).exists()).toBe(false);
     });
+
+    it('should not display a footer with the create button', () => {
+      expect(findCreateEnvironmentButton().exists()).toBe(false);
+    });
   });
 });
diff --git a/spec/frontend/feature_flags/components/strategy_spec.js b/spec/frontend/feature_flags/components/strategy_spec.js
index ca6e338ac6c..90021829212 100644
--- a/spec/frontend/feature_flags/components/strategy_spec.js
+++ b/spec/frontend/feature_flags/components/strategy_spec.js
@@ -1,11 +1,14 @@
 import { GlAlert, GlFormSelect, GlLink, GlToken, GlButton } from '@gitlab/ui';
 import { mount } from '@vue/test-utils';
+import MockAdapter from 'axios-mock-adapter';
 import Vue, { nextTick } from 'vue';
 import { last } from 'lodash';
 // eslint-disable-next-line no-restricted-imports
 import Vuex from 'vuex';
 import Api from '~/api';
+import axios from '~/lib/utils/axios_utils';
 import NewEnvironmentsDropdown from '~/feature_flags/components/new_environments_dropdown.vue';
+import { HTTP_STATUS_OK } from '~/lib/utils/http_status';
 import Strategy from '~/feature_flags/components/strategy.vue';
 import StrategyParameters from '~/feature_flags/components/strategy_parameters.vue';
 import {
@@ -22,16 +25,18 @@ import { userList } from '../mock_data';
 
 jest.mock('~/api');
 
+const TEST_HOST = '/test';
 const provide = {
   strategyTypeDocsPagePath: 'link-to-strategy-docs',
   environmentsScopeDocsPath: 'link-scope-docs',
-  environmentsEndpoint: '',
+  environmentsEndpoint: TEST_HOST,
 };
 
 Vue.use(Vuex);
 
 describe('Feature flags strategy', () => {
   let wrapper;
+  let axiosMock;
 
   const findStrategyParameters = () => wrapper.findComponent(StrategyParameters);
   const findDocsLinks = () => wrapper.findAllComponents(GlLink);
@@ -45,6 +50,8 @@ describe('Feature flags strategy', () => {
       provide,
     },
   ) => {
+    axiosMock = new MockAdapter(axios);
+    axiosMock.onGet(TEST_HOST).reply(HTTP_STATUS_OK, []);
     wrapper = mount(Strategy, { store: createStore({ projectId: '1' }), ...opts });
   };
 
@@ -52,6 +59,10 @@ describe('Feature flags strategy', () => {
     Api.searchFeatureFlagUserLists.mockResolvedValue({ data: [userList] });
   });
 
+  afterEach(() => {
+    axiosMock.restore();
+  });
+
   describe('helper links', () => {
     const propsData = { strategy: {}, index: 0, userLists: [userList] };
     factory({ propsData, provide });
diff --git a/spec/frontend/vue_shared/components/blob_viewers/rich_viewer_spec.js b/spec/frontend/vue_shared/components/blob_viewers/rich_viewer_spec.js
index 6a3337aa046..eadcd452929 100644
--- a/spec/frontend/vue_shared/components/blob_viewers/rich_viewer_spec.js
+++ b/spec/frontend/vue_shared/components/blob_viewers/rich_viewer_spec.js
@@ -29,6 +29,8 @@ describe('Blob Rich Viewer component', () => {
 
   beforeEach(() => createComponent());
 
+  const findMarkdownFieldView = () => wrapper.findComponent(MarkdownFieldView);
+
   describe('Markdown content', () => {
     const generateDummyContent = (contentLength) => {
       let generatedContent = '';
@@ -48,14 +50,17 @@ describe('Blob Rich Viewer component', () => {
         expect(wrapper.text()).toContain('Line: 10');
         expect(wrapper.text()).not.toContain('Line: 50');
         expect(wrapper.emitted(CONTENT_LOADED_EVENT)).toBeUndefined();
+        expect(findMarkdownFieldView().props('isLoading')).toBe(true);
       });
 
-      it('renders the rest of the file later and emits a content loaded event', () => {
+      it('renders the rest of the file later and emits a content loaded event', async () => {
         jest.runAllTimers();
+        await nextTick();
 
         expect(wrapper.text()).toContain('Line: 10');
         expect(wrapper.text()).toContain('Line: 50');
         expect(wrapper.emitted(CONTENT_LOADED_EVENT)).toHaveLength(1);
+        expect(findMarkdownFieldView().props('isLoading')).toBe(false);
       });
 
       it('sanitizes the content', () => {
@@ -72,6 +77,7 @@ describe('Blob Rich Viewer component', () => {
       it('renders the entire file immediately and emits a content loaded event', () => {
         expect(wrapper.text()).toContain('Line: 5');
         expect(wrapper.emitted(CONTENT_LOADED_EVENT)).toHaveLength(1);
+        expect(findMarkdownFieldView().props('isLoading')).toBe(false);
       });
 
       it('sanitizes the content', () => {
@@ -97,7 +103,7 @@ describe('Blob Rich Viewer component', () => {
   });
 
   it('is using Markdown View Field', () => {
-    expect(wrapper.findComponent(MarkdownFieldView).exists()).toBe(true);
+    expect(findMarkdownFieldView().exists()).toBe(true);
   });
 
   it('scrolls to the hash location', () => {
diff --git a/spec/frontend/vue_shared/components/markdown/field_view_spec.js b/spec/frontend/vue_shared/components/markdown/field_view_spec.js
index 1bbbe0896f2..f61c67c4f9b 100644
--- a/spec/frontend/vue_shared/components/markdown/field_view_spec.js
+++ b/spec/frontend/vue_shared/components/markdown/field_view_spec.js
@@ -6,15 +6,27 @@ import { renderGFM } from '~/behaviors/markdown/render_gfm';
 jest.mock('~/behaviors/markdown/render_gfm');
 
 describe('Markdown Field View component', () => {
-  function createComponent() {
-    shallowMount(MarkdownFieldView);
+  function createComponent(isLoading = false) {
+    shallowMount(MarkdownFieldView, { propsData: { isLoading } });
   }
 
-  beforeEach(() => {
-    createComponent();
-  });
-
   it('processes rendering with GFM', () => {
+    createComponent();
+
     expect(renderGFM).toHaveBeenCalledTimes(1);
   });
+
+  describe('watchers', () => {
+    it('does not process rendering with GFM if isLoading is true', () => {
+      createComponent(true);
+
+      expect(renderGFM).not.toHaveBeenCalled();
+    });
+
+    it('processes rendering with GFM when isLoading is updated to `false`', () => {
+      createComponent(false);
+
+      expect(renderGFM).toHaveBeenCalledTimes(1);
+    });
+  });
 });
diff --git a/spec/graphql/types/ci/job_type_spec.rb b/spec/graphql/types/ci/job_type_spec.rb
index f31c0d5255c..a69c6f37ee1 100644
--- a/spec/graphql/types/ci/job_type_spec.rb
+++ b/spec/graphql/types/ci/job_type_spec.rb
@@ -32,6 +32,7 @@ RSpec.describe Types::Ci::JobType, feature_category: :continuous_integration do
       needs
       pipeline
       playable
+      previousStageJobs
       previousStageJobsOrNeeds
       project
       queued_at
diff --git a/spec/helpers/sidekiq_helper_spec.rb b/spec/helpers/sidekiq_helper_spec.rb
index 6a0a92bafd8..594996bac95 100644
--- a/spec/helpers/sidekiq_helper_spec.rb
+++ b/spec/helpers/sidekiq_helper_spec.rb
@@ -2,7 +2,7 @@
 
 require 'spec_helper'
 
-RSpec.describe SidekiqHelper do
+RSpec.describe SidekiqHelper, feature_category: :shared do
   describe 'parse_sidekiq_ps' do
     it 'parses line with time' do
       line = '55137	10,0	2,1	S+	2:30pm	sidekiq 4.1.4 gitlab [0 of 25 busy]   '
diff --git a/spec/lib/gitlab/prometheus/additional_metrics_parser_spec.rb b/spec/lib/gitlab/prometheus/additional_metrics_parser_spec.rb
deleted file mode 100644
index 559557f9313..00000000000
--- a/spec/lib/gitlab/prometheus/additional_metrics_parser_spec.rb
+++ /dev/null
@@ -1,248 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe Gitlab::Prometheus::AdditionalMetricsParser do
-  include Prometheus::MetricBuilders
-
-  let(:parser_error_class) { Gitlab::Prometheus::ParsingError }
-
-  describe '#load_groups_from_yaml' do
-    subject { described_class.load_groups_from_yaml('dummy.yaml') }
-
-    describe 'parsing sample yaml' do
-      let(:sample_yaml) do
-        <<-EOF.strip_heredoc
-          - group: group_a
-            priority: 1
-            metrics:
-              - title: "title"
-                required_metrics: [ metric_a, metric_b ]
-                weight: 1
-                queries: [{ query_range: 'query_range_a', label: label, unit: unit }]
-              - title: "title"
-                required_metrics: [metric_a]
-                weight: 1
-                queries: [{ query_range: 'query_range_empty' }]
-          - group: group_b
-            priority: 1
-            metrics:
-              - title: title
-                required_metrics: ['metric_a']
-                weight: 1
-                queries: [{query_range: query_range_a}]
-        EOF
-      end
-
-      before do
-        allow(described_class).to receive(:load_yaml_file) { YAML.safe_load(sample_yaml) }
-      end
-
-      it 'parses to two metric groups with 2 and 1 metric respectively' do
-        expect(subject.count).to eq(2)
-        expect(subject[0].metrics.count).to eq(2)
-        expect(subject[1].metrics.count).to eq(1)
-      end
-
-      it 'provide group data' do
-        expect(subject[0]).to have_attributes(name: 'group_a', priority: 1)
-        expect(subject[1]).to have_attributes(name: 'group_b', priority: 1)
-      end
-
-      it 'provides metrics data' do
-        metrics = subject.flat_map(&:metrics)
-
-        expect(metrics.count).to eq(3)
-        expect(metrics[0]).to have_attributes(title: 'title', required_metrics: %w(metric_a metric_b), weight: 1)
-        expect(metrics[1]).to have_attributes(title: 'title', required_metrics: %w(metric_a), weight: 1)
-        expect(metrics[2]).to have_attributes(title: 'title', required_metrics: %w{metric_a}, weight: 1)
-      end
-
-      it 'provides query data' do
-        queries = subject.flat_map(&:metrics).flat_map(&:queries)
-
-        expect(queries.count).to eq(3)
-        expect(queries[0]).to eq(query_range: 'query_range_a', label: 'label', unit: 'unit')
-        expect(queries[1]).to eq(query_range: 'query_range_empty')
-        expect(queries[2]).to eq(query_range: 'query_range_a')
-      end
-    end
-
-    shared_examples 'required field' do |field_name|
-      context "when #{field_name} is nil" do
-        before do
-          allow(described_class).to receive(:load_yaml_file) { YAML.safe_load(field_missing) }
-        end
-
-        it 'throws parsing error' do
-          expect { subject }.to raise_error(parser_error_class, /#{field_name} can't be blank/i)
-        end
-      end
-
-      context "when #{field_name} are not specified" do
-        before do
-          allow(described_class).to receive(:load_yaml_file) { YAML.safe_load(field_nil) }
-        end
-
-        it 'throws parsing error' do
-          expect { subject }.to raise_error(parser_error_class, /#{field_name} can't be blank/i)
-        end
-      end
-    end
-
-    describe 'group required fields' do
-      it_behaves_like 'required field', 'metrics' do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-          EOF
-        end
-      end
-
-      it_behaves_like 'required field', 'name' do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group:
-              priority: 1
-              metrics: []
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - priority: 1
-              metrics: []
-          EOF
-        end
-      end
-
-      it_behaves_like 'required field', 'priority' do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority:
-              metrics: []
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              metrics: []
-          EOF
-        end
-      end
-    end
-
-    describe 'metrics fields parsing' do
-      it_behaves_like 'required field', 'title' do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title:
-                required_metrics: []
-                weight: 1
-                queries: []
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - required_metrics: []
-                weight: 1
-                queries: []
-          EOF
-        end
-      end
-
-      it_behaves_like 'required field', 'required metrics' do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title: title
-                required_metrics:
-                weight: 1
-                queries: []
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title: title
-                weight: 1
-                queries: []
-          EOF
-        end
-      end
-
-      it_behaves_like 'required field', 'weight' do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title: title
-                required_metrics: []
-                weight:
-                queries: []
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title: title
-                required_metrics: []
-                queries: []
-          EOF
-        end
-      end
-
-      it_behaves_like 'required field', :queries do
-        let(:field_nil) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title: title
-                required_metrics: []
-                weight: 1
-                queries:
-          EOF
-        end
-
-        let(:field_missing) do
-          <<-EOF.strip_heredoc
-            - group: group_a
-              priority: 1
-              metrics:
-              - title: title
-                required_metrics: []
-                weight: 1
-          EOF
-        end
-      end
-    end
-  end
-end
diff --git a/spec/models/concerns/issuable_spec.rb b/spec/models/concerns/issuable_spec.rb
index c6f3cfc7b8a..705f8f46a90 100644
--- a/spec/models/concerns/issuable_spec.rb
+++ b/spec/models/concerns/issuable_spec.rb
@@ -626,6 +626,21 @@ RSpec.describe Issuable, feature_category: :team_planning do
     end
   end
 
+  describe "#importing_or_transitioning?" do
+    let(:merge_request) { build(:merge_request, transitioning: transitioning, importing: importing) }
+
+    where(:transitioning, :importing, :result) do
+      true  | false | true
+      false | true  | true
+      true  | true  | true
+      false | false | false
+    end
+
+    with_them do
+      it { expect(merge_request.importing_or_transitioning?).to eq(result) }
+    end
+  end
+
   describe '#labels_array' do
     let(:project) { create(:project) }
     let(:bug) { create(:label, project: project, title: 'bug') }
diff --git a/spec/models/concerns/transitionable_spec.rb b/spec/models/concerns/transitionable_spec.rb
new file mode 100644
index 00000000000..a1f011ff72e
--- /dev/null
+++ b/spec/models/concerns/transitionable_spec.rb
@@ -0,0 +1,42 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Transitionable, feature_category: :code_review_workflow do
+  let(:klass) do
+    Class.new do
+      include Transitionable
+
+      def initialize(transitioning)
+        @transitioning = transitioning
+      end
+
+      def project
+        Project.new
+      end
+    end
+  end
+
+  let(:object) { klass.new(transitioning) }
+
+  describe 'For a class' do
+    using RSpec::Parameterized::TableSyntax
+
+    describe '#transitioning?' do
+      where(:transitioning, :feature_flag, :result) do
+        true  | true  | true
+        false | false | false
+        true  | false | false
+        false | true  | false
+      end
+
+      with_them do
+        before do
+          stub_feature_flags(skip_validations_during_transitions: feature_flag)
+        end
+
+        it { expect(object.transitioning?).to eq(result) }
+      end
+    end
+  end
+end
diff --git a/spec/models/merge_request_spec.rb b/spec/models/merge_request_spec.rb
index 3a71ec01b5c..2728c9ae72b 100644
--- a/spec/models/merge_request_spec.rb
+++ b/spec/models/merge_request_spec.rb
@@ -360,6 +360,23 @@ RSpec.describe MergeRequest, factory_default: :keep, feature_category: :code_rev
       end
     end
 
+    describe "#validate_reviewer_size_length" do
+      let(:merge_request) { build(:merge_request, transitioning: transitioning) }
+
+      where(:transitioning, :to_or_not_to) do
+        false  | :to
+        true   | :not_to
+      end
+
+      with_them do
+        it do
+          expect(merge_request).send(to_or_not_to, receive(:validate_reviewer_size_length))
+
+          merge_request.valid?
+        end
+      end
+    end
+
     describe '#validate_target_project' do
       let(:merge_request) do
         build(:merge_request, source_project: project, target_project: project, importing: importing)
@@ -386,6 +403,23 @@ RSpec.describe MergeRequest, factory_default: :keep, feature_category: :code_rev
           it { expect(merge_request.valid?(false)).to eq true }
         end
       end
+
+      context "with the skip_validations_during_transition_feature_flag" do
+        let(:merge_request) { build(:merge_request, transitioning: transitioning) }
+
+        where(:transitioning, :to_or_not_to) do
+          false | :to
+          true  | :not_to
+        end
+
+        with_them do
+          it do
+            expect(merge_request).send(to_or_not_to, receive(:validate_target_project))
+
+            merge_request.valid?
+          end
+        end
+      end
     end
   end
 
@@ -4487,6 +4521,7 @@ RSpec.describe MergeRequest, factory_default: :keep, feature_category: :code_rev
     shared_examples 'for an invalid state transition' do
       specify 'is not a valid state transition' do
         expect { transition! }.to raise_error(StateMachines::InvalidTransition)
+        expect(subject.transitioning?).to be_falsey
       end
     end
 
@@ -4496,6 +4531,7 @@ RSpec.describe MergeRequest, factory_default: :keep, feature_category: :code_rev
           .to change { subject.merge_status }
           .from(merge_status.to_s)
           .to(expected_merge_status)
+        expect(subject.transitioning?).to be_falsey
       end
     end
 
diff --git a/spec/models/performance_monitoring/prometheus_metric_spec.rb b/spec/models/performance_monitoring/prometheus_metric_spec.rb
deleted file mode 100644
index 58bb59793cf..00000000000
--- a/spec/models/performance_monitoring/prometheus_metric_spec.rb
+++ /dev/null
@@ -1,67 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe PerformanceMonitoring::PrometheusMetric do
-  let(:json_content) do
-    {
-      "id" => "metric_of_ages",
-      "unit" => "count",
-      "label" => "Metric of Ages",
-      "query_range" => "http_requests_total"
-    }
-  end
-
-  describe '.from_json' do
-    subject { described_class.from_json(json_content) }
-
-    it 'creates a PrometheusMetric object' do
-      expect(subject).to be_a described_class
-      expect(subject.id).to eq(json_content['id'])
-      expect(subject.unit).to eq(json_content['unit'])
-      expect(subject.label).to eq(json_content['label'])
-      expect(subject.query_range).to eq(json_content['query_range'])
-    end
-
-    describe 'validations' do
-      context 'json_content is not a hash' do
-        let(:json_content) { nil }
-
-        subject { described_class.from_json(json_content) }
-
-        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
-      end
-
-      context 'when unit is missing' do
-        before do
-          json_content['unit'] = nil
-        end
-
-        subject { described_class.from_json(json_content) }
-
-        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
-      end
-
-      context 'when query and query_range is missing' do
-        before do
-          json_content['query_range'] = nil
-        end
-
-        subject { described_class.from_json(json_content) }
-
-        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
-      end
-
-      context 'when query_range is missing but query is available' do
-        before do
-          json_content['query_range'] = nil
-          json_content['query'] = 'http_requests_total'
-        end
-
-        subject { described_class.from_json(json_content) }
-
-        it { is_expected.to be_valid }
-      end
-    end
-  end
-end
diff --git a/spec/models/performance_monitoring/prometheus_panel_spec.rb b/spec/models/performance_monitoring/prometheus_panel_spec.rb
deleted file mode 100644
index 3dc05576826..00000000000
--- a/spec/models/performance_monitoring/prometheus_panel_spec.rb
+++ /dev/null
@@ -1,74 +0,0 @@
-# frozen_string_literal: true
-
-require 'spec_helper'
-
-RSpec.describe PerformanceMonitoring::PrometheusPanel do
-  let(:json_content) do
-    {
-      "max_value" => 1,
-      "type" => "area-chart",
-      "title" => "Chart Title",
-      "y_label" => "Y-Axis",
-      "weight" => 1,
-      "metrics" => [{
-        "id" => "metric_of_ages",
-        "unit" => "count",
-        "label" => "Metric of Ages",
-        "query_range" => "http_requests_total"
-      }]
-    }
-  end
-
-  describe '#new' do
-    it 'accepts old schema format' do
-      expect { described_class.new(json_content) }.not_to raise_error
-    end
-
-    it 'accepts new schema format' do
-      expect { described_class.new(json_content.merge("y_axis" => { "precision" => 0 })) }.not_to raise_error
-    end
-  end
-
-  describe '.from_json' do
-    describe 'validations' do
-      context 'json_content is not a hash' do
-        let(:json_content) { nil }
-
-        subject { described_class.from_json(json_content) }
-
-        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
-      end
-
-      context 'when title is missing' do
-        before do
-          json_content['title'] = nil
-        end
-
-        subject { described_class.from_json(json_content) }
-
-        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
-      end
-
-      context 'when metrics are missing' do
-        before do
-          json_content.delete('metrics')
-        end
-
-        subject { described_class.from_json(json_content) }
-
-        it { expect { subject }.to raise_error(ActiveModel::ValidationError) }
-      end
-    end
-  end
-
-  describe '.id' do
-    it 'returns hexdigest of group_title, type and title as the panel id' do
-      group_title = 'Business Group'
-      panel_type  = 'area-chart'
-      panel_title = 'New feature requests made'
-
-      expect(Digest::SHA2).to receive(:hexdigest).with("#{group_title}#{panel_type}#{panel_title}").and_return('hexdigest')
-      expect(described_class.new(title: panel_title, type: panel_type).id(group_title)).to eql 'hexdigest'
-    end
-  end
-end
diff --git a/spec/requests/api/graphql/ci/jobs_spec.rb b/spec/requests/api/graphql/ci/jobs_spec.rb
index 756fcd8b7cd..ab2ebf134d7 100644
--- a/spec/requests/api/graphql/ci/jobs_spec.rb
+++ b/spec/requests/api/graphql/ci/jobs_spec.rb
@@ -139,7 +139,10 @@ RSpec.describe 'Query.project.pipeline', feature_category: :continuous_integrati
     let(:pipeline) do
       pipeline = create(:ci_pipeline, project: project, user: user)
       stage = create(:ci_stage, project: project, pipeline: pipeline, name: 'first', position: 1)
-      create(:ci_build, stage_id: stage.id, pipeline: pipeline, name: 'my test job', scheduling_type: :stage)
+      create(
+        :ci_build, pipeline: pipeline, name: 'my test job',
+        scheduling_type: :stage, stage_id: stage.id, stage_idx: stage.position
+      )
 
       pipeline
     end
@@ -180,10 +183,10 @@ RSpec.describe 'Query.project.pipeline', feature_category: :continuous_integrati
                 previousStageJobsOrNeeds {
                   nodes {
                       ... on CiBuildNeed {
-                        #{all_graphql_fields_for('CiBuildNeed')}
+                        name
                       }
                       ... on CiJob {
-                        #{all_graphql_fields_for('CiJob', excluded: %w[aiFailureAnalysis])}
+                        name
                       }
                     }
                 }
@@ -211,10 +214,12 @@ RSpec.describe 'Query.project.pipeline', feature_category: :continuous_integrati
       before do
         build_stage = create(:ci_stage, position: 2, name: 'build', project: project, pipeline: pipeline)
         test_stage = create(:ci_stage, position: 3, name: 'test', project: project, pipeline: pipeline)
+        deploy_stage = create(:ci_stage, position: 4, name: 'deploy', project: project, pipeline: pipeline)
 
         create(:ci_build, pipeline: pipeline, name: 'docker 1 2', scheduling_type: :stage, ci_stage: build_stage, stage_idx: build_stage.position)
         create(:ci_build, pipeline: pipeline, name: 'docker 2 2', ci_stage: build_stage, stage_idx: build_stage.position, scheduling_type: :dag)
         create(:ci_build, pipeline: pipeline, name: 'rspec 1 2', scheduling_type: :stage, ci_stage: test_stage, stage_idx: test_stage.position)
+        create(:ci_build, pipeline: pipeline, name: 'deploy', scheduling_type: :stage, ci_stage: deploy_stage, stage_idx: deploy_stage.position)
         test_job = create(:ci_build, pipeline: pipeline, name: 'rspec 2 2', scheduling_type: :dag, ci_stage: test_stage, stage_idx: test_stage.position)
 
         create(:ci_build_need, build: test_job, name: 'my test job')
@@ -255,6 +260,14 @@ RSpec.describe 'Query.project.pipeline', feature_category: :continuous_integrati
             'previousStageJobsOrNeeds' => { 'nodes' => [
               a_hash_including('name' => 'my test job')
             ] }
+          ),
+          a_hash_including(
+            'name' => 'deploy',
+            'needs' => { 'nodes' => [] },
+            'previousStageJobsOrNeeds' => { 'nodes' => [
+              a_hash_including('name' => 'rspec 1 2'),
+              a_hash_including('name' => 'rspec 2 2')
+            ] }
           )
         )
       end
@@ -613,3 +626,87 @@ RSpec.describe 'Query.project.pipeline', feature_category: :continuous_integrati
     end
   end
 end
+
+RSpec.describe 'previousStageJobs', feature_category: :pipeline_composition do
+  include GraphqlHelpers
+
+  let_it_be(:project) { create(:project, :public) }
+  let_it_be(:pipeline) { create(:ci_pipeline, project: project) }
+
+  let(:query) do
+    <<~QUERY
+    {
+      project(fullPath: "#{project.full_path}") {
+        pipeline(iid: "#{pipeline.iid}") {
+          stages {
+            nodes {
+              groups {
+                nodes {
+                  jobs {
+                    nodes {
+                      name
+                      previousStageJobs {
+                        nodes {
+                          name
+                          downstreamPipeline {
+                            id
+                          }
+                        }
+                      }
+                    }
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+    QUERY
+  end
+
+  it 'does not produce N+1 queries', :request_store, :use_sql_query_cache do
+    user1 = create(:user)
+    user2 = create(:user)
+
+    create_stage_with_build_and_bridge('build', 0)
+    create_stage_with_build_and_bridge('test', 1)
+
+    control = ActiveRecord::QueryRecorder.new(skip_cached: false) do
+      post_graphql(query, current_user: user1)
+    end
+
+    expect(graphql_data_previous_stage_jobs).to eq(
+      'build_build' => [],
+      'test_build' => %w[build_build]
+    )
+
+    create_stage_with_build_and_bridge('deploy', 2)
+
+    expect do
+      post_graphql(query, current_user: user2)
+    end.to issue_same_number_of_queries_as(control)
+
+    expect(graphql_data_previous_stage_jobs).to eq(
+      'build_build' => [],
+      'test_build' => %w[build_build],
+      'deploy_build' => %w[test_build]
+    )
+  end
+
+  def create_stage_with_build_and_bridge(stage_name, stage_position)
+    stage = create(:ci_stage, position: stage_position, name: "#{stage_name}_stage", project: project, pipeline: pipeline)
+
+    create(:ci_build, pipeline: pipeline, name: "#{stage_name}_build", ci_stage: stage, stage_idx: stage.position)
+  end
+
+  def graphql_data_previous_stage_jobs
+    stages = graphql_data.dig('project', 'pipeline', 'stages', 'nodes')
+    groups = stages.flat_map { |stage| stage.dig('groups', 'nodes') }
+    jobs = groups.flat_map { |group| group.dig('jobs', 'nodes') }
+
+    jobs.each_with_object({}) do |job, previous_stage_jobs|
+      previous_stage_jobs[job['name']] = job.dig('previousStageJobs', 'nodes').pluck('name')
+    end
+  end
+end