Add API for Group Deployment Frequency

- **ee/changelogs/unreleased/
    group-level-deployment-frequency-api.yml:**

Changelog.

- **doc/api/dora4_group_analytics.md:**
- **doc/user/group/index.md:**
- **doc/user/analytics/ci_cd_analytics.md:**

Docs.

- **ee/app/models/license.rb:**
- **ee/lib/api/analytics/group_deployment_frequency.rb:**
- **ee/lib/ee/api/api.rb:**
- **ee/spec/finders/analytics/deployments_finder_spec.rb:**

Add support for groups.

- **ee/spec/policies/group_policy_spec.rb:**
- **ee/spec/requests/api/analytics/group_deployment_frequency_spec.rb:**
- **app/finders/deployments_finder.rb:**

**config/feature_flags/development/
  dora4_sorted_group_deployment_frequency.yml:**

New feature flag to gate sorting deployments by finished_at for API
response at the group scope.

New tests.

- **doc/api/dora4_project_analytics.md:**
- **doc/api/project_analytics.md:**
- **doc/user/project/index.md:**
- **ee/app/helpers/ee/graph_helper.rb:**
- **ee/app/policies/ee/group_policy.rb:**
- **ee/app/policies/ee/project_policy.rb:**
- **ee/lib/api/analytics/project_deployment_frequency.rb:**
- **ee/spec/frontend/fixtures/analytics/project_analytics.rb:**
- **ee/spec/helpers/ee/graph_helper_spec.rb:**
- **ee/spec/policies/project_policy_spec.rb:**
- **ee/spec/requests/api/analytics/
    project_deployment_frequency_spec.rb:**

Updated name to prevent conflicts.

- **config/feature_flags/development/
    dora4_sorted_group_deployment_frequency.yml:**

New feature flag for potentially slow query.

- **ee/lib/ee/api/entities/analytics/deployment_frequency.rb:**

Updated to add proper datetime formatting.

- **app/models/deployment.rb:**
- **spec/models/deployment_spec.rb:**

Added support for finished_between and finished_after.

- **ee/app/services/analytics/deployments/frequency/
    aggregate_service.rb:**
- **ee/spec/services/analytics/deployments/frequency/
    aggregate_service_spec.rb:**

Adds a service to aggregate frequency deployments.

- **locale/gitlab.pot:**

Updated.

app/finders/deployments_finder.rb

 # frozen_string_literal: true
 
+# WARNING: This finder does not check permissions!
+#
 # Arguments:
 #   params:
 #     project: Project model - Find deployments for this project
@@ -27,11 +29,13 @@ class DeploymentsFinder
   def execute
     items = init_collection
     items = by_updated_at(items)
+    items = by_finished_at(items)
     items = by_environment(items)
     items = by_status(items)
     items = preload_associations(items)
-    items = by_finished_between(items)
-    sort(items)
+    items = sort(items)
+
+    items
   end
 
   private
@@ -44,11 +48,9 @@ class DeploymentsFinder
     end
   end
 
-  # rubocop: disable CodeReuse/ActiveRecord
   def sort(items)
-    items.order(sort_params)
+    items.order(sort_params) # rubocop: disable CodeReuse/ActiveRecord
   end
-  # rubocop: enable CodeReuse/ActiveRecord
 
   def by_updated_at(items)
     items = items.updated_before(params[:updated_before]) if params[:updated_before].present?
@@ -57,6 +59,13 @@ class DeploymentsFinder
     items
   end
 
+  def by_finished_at(items)
+    items = items.finished_before(params[:finished_before]) if params[:finished_before].present?
+    items = items.finished_after(params[:finished_after]) if params[:finished_after].present?
+
+    items
+  end
+
   def by_environment(items)
     if params[:environment].present?
       items.for_environment_name(params[:environment])
@@ -65,12 +74,6 @@ class DeploymentsFinder
     end
   end
 
-  def by_finished_between(items)
-    items = items.finished_between(params[:finished_after], params[:finished_before].presence) if params[:finished_after].present?
-
-    items
-  end
-
   def by_status(items)
     return items unless params[:status].present?
 

app/models/deployment.rb

@@ -38,6 +38,7 @@ class Deployment < ApplicationRecord
 
   scope :for_status, -> (status) { where(status: status) }
   scope :for_project, -> (project_id) { where(project_id: project_id) }
+  scope :for_projects, -> (projects) { where(project: projects) }
 
   scope :visible, -> { where(status: %i[running success failed canceled]) }
   scope :stoppable, -> { where.not(on_stop: nil).where.not(deployable_id: nil).success }
@@ -45,11 +46,8 @@ class Deployment < ApplicationRecord
   scope :older_than, -> (deployment) { where('deployments.id < ?', deployment.id) }
   scope :with_deployable, -> { joins('INNER JOIN ci_builds ON ci_builds.id = deployments.deployable_id').preload(:deployable) }
 
-  scope :finished_between, -> (start_date, end_date = nil) do
-    selected = where('deployments.finished_at >= ?', start_date)
-    selected = selected.where('deployments.finished_at < ?', end_date) if end_date
-    selected
-  end
+  scope :finished_after, ->(date) { where('finished_at >= ?', date) }
+  scope :finished_before, ->(date) { where('finished_at < ?', date) }
 
   FINISHED_STATUSES = %i[success failed canceled].freeze
 

doc/api/dora4_group_analytics.md

+---
+stage: Release
+group: Release
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
+type: reference, api
+---
+
+# DORA4 Analytics Group API **(ULTIMATE ONLY)**
+
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/291747) in GitLab 13.9.
+> - It's [deployed behind a feature flag](../user/feature_flags.md), disabled by default.
+> - It's disabled on GitLab.com.
+> - It's not recommended for production use.
+> - To use it in GitLab self-managed instances, ask a GitLab administrator to [enable it](#enable-or-disable-dora4-analytics-group-api). **(ULTIMATE ONLY)**
+
+WARNING:
+This feature might not be available to you. Check the **version history** note above for details.
+
+All methods require reporter authorization.
+
+## List group deployment frequencies
+
+Get a list of all group deployment frequencies:
+
+```plaintext
+GET /groups/:id/analytics/deployment_frequency?environment=:environment&from=:from&to=:to&interval=:interval
+```
+
+Attributes:
+
+| Attribute    | Type   | Required | Description           |
+|--------------|--------|----------|-----------------------|
+| `id`         | string | yes      | The ID of the group. |
+
+Parameters:
+
+| Parameter    | Type   | Required | Description           |
+|--------------|--------|----------|-----------------------|
+| `environment`| string | yes      | The name of the environment to filter by. |
+| `from`       | string | yes      | Datetime range to start from. Inclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`). |
+| `to`         | string | no       | Datetime range to end at. Exclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`). |
+| `interval`   | string | no       | The bucketing interval (`all`, `monthly`, `daily`). |
+
+Example request:
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/groups/:id/analytics/deployment_frequency?environment=:environment&from=:from&to=:to&interval=:interval"
+```
+
+Example response:
+
+```json
+[
+  {
+    "from": "2017-01-01",
+    "to": "2017-01-02",
+    "value": 106
+  },
+  {
+    "from": "2017-01-02",
+    "to": "2017-01-03",
+    "value": 55
+  }
+]
+```
+
+## Enable or disable DORA4 Analytics Group API **(ULTIMATE ONLY)**
+
+DORA4 Analytics Group API is under development and not ready for production use. It is
+deployed behind a feature flag that is **disabled by default**.
+[GitLab administrators with access to the GitLab Rails console](../administration/feature_flags.md)
+can enable it.
+
+To enable it:
+
+```ruby
+Feature.enable(:dora4_group_deployment_frequency_api)
+```
+
+To disable it:
+
+```ruby
+Feature.disable(:dora4_group_deployment_frequency_api)
+```

doc/api/dora4_project_analytics.md

+---
+stage: Release
+group: Release
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
+type: reference, api
+---
+
+# DORA4 Analytics Project API **(ULTIMATE ONLY)**
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/279039) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 13.7.
+
+All methods require reporter authorization.
+
+## List project deployment frequencies
+
+Get a list of all project deployment frequencies, sorted by date:
+
+```plaintext
+GET /projects/:id/analytics/deployment_frequency?environment=:environment&from=:from&to=:to&interval=:interval
+```
+
+| Attribute    | Type   | Required | Description           |
+|--------------|--------|----------|-----------------------|
+| `id`         | string | yes      | The ID of the project |
+
+| Parameter    | Type   | Required | Description           |
+|--------------|--------|----------|-----------------------|
+| `environment`| string | yes      | The name of the environment to filter by |
+| `from`       | string | yes      | Datetime range to start from, inclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`) |
+| `to`         | string | no       | Datetime range to end at, exclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`) |
+| `interval`   | string | no       | The bucketing interval (`all`, `monthly`, `daily`) |
+
+Example request:
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/:id/analytics/deployment_frequency?environment=:environment&from=:from&to=:to&interval=:interval"
+```
+
+Example response:
+
+```json
+[
+  {
+    "from": "2017-01-01",
+    "to": "2017-01-02",
+    "value": 106
+  },
+  {
+    "from": "2017-01-02",
+    "to": "2017-01-03",
+    "value": 55
+  }
+]
+```

doc/api/project_analytics.md

 ---
-stage: Release
-group: Release
-info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
-type: reference, api
+redirect_to: 'dora4_project_analytics.md'
 ---
 
-# Project Analytics API **(ULTIMATE SELF)**
+This document was moved to [another location](dora4_project_analytics.md).
 
-> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/279039) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 13.7.
-
-All methods require reporter authorization.
-
-## List project deployment frequencies
-
-Get a list of all project aliases:
-
-```plaintext
-GET /projects/:id/analytics/deployment_frequency?environment=:environment&from=:from&to=:to&interval=:interval
-```
-
-| Attribute    | Type   | Required | Description           |
-|--------------|--------|----------|-----------------------|
-| `id`         | string | yes      | The ID of the project |
-
-| Parameter    | Type   | Required | Description           |
-|--------------|--------|----------|-----------------------|
-| `environment`| string | yes      | The name of the environment to filter by |
-| `from`       | string | yes      | Datetime range to start from, inclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`) |
-| `to`         | string | no       | Datetime range to end at, exclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`) |
-| `interval`   | string | no       | The bucketing interval (`all`, `monthly`, `daily`) |
-
-```shell
-curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/:id/analytics/deployment_frequency?from=:from&to=:to&interval=:interval"
-```
-
-Example response:
-
-```json
-[
-  {
-    "from": "2017-01-01",
-    "to": "2017-01-02",
-    "value": 106
-  },
-  {
-    "from": "2017-01-02",
-    "to": "2017-01-03",
-    "value": 55
-  }
-]
-```
+<!-- This redirect file can be deleted after <2021-04-25>. -->
+<!-- Before deletion, see: https://docs.gitlab.com/ee/development/documentation/#move-or-rename-a-page -->

doc/user/analytics/ci_cd_analytics.md

@@ -42,8 +42,8 @@ performance indicators for software development teams:
   production.
 
 GitLab plans to add support for all the DORA4 metrics at the project and group levels. GitLab added
-the first metric, deployment frequency, at the project level for [CI/CD charts](ci_cd_analytics.md#deployment-frequency-charts)
-and the [API]( ../../api/project_analytics.md).
+the first metric, deployment frequency, at the project and group scopes for [CI/CD charts](ci_cd_analytics.md#deployment-frequency-charts),
+the [Project API]( ../../api/dora4_project_analytics.md), and the [Group API]( ../../api/dora4_group_analytics.md).
 
 ## Deployment frequency charts **(ULTIMATE)**
 

doc/user/group/index.md

@@ -870,3 +870,13 @@ questions that you know someone might ask.
 Each scenario can be a third-level heading, e.g. `### Getting error message X`.
 If you have none to add when creating a doc, leave this section in place
 but commented out to help encourage others to add to it in the future. -->
+
+## DORA4 analytics overview **(ULTIMATE ONLY)**
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/291747) in GitLab [Ultimate](https://about.gitlab.com/pricing/) 13.9 as a [Beta feature](https://about.gitlab.com/handbook/product/gitlab-the-product/#beta).
+
+Group details include the following analytics:
+
+- Deployment Frequency
+
+For more information, see [DORA4 Project Analytics API](../../api/dora4_group_analytics.md).

doc/user/project/index.md

@@ -152,9 +152,9 @@ There are numerous [APIs](../../api/README.md) to use with your projects:
 - [Traffic](../../api/project_statistics.md)
 - [Variables](../../api/project_level_variables.md)
 - [Aliases](../../api/project_aliases.md)
-- [Analytics](../../api/project_analytics.md)
+- [DORA4 Analytics](../../api/dora4_project_analytics.md)
 
-## Project activity analytics overview **(ULTIMATE SELF)**
+## DORA4 analytics overview **(ULTIMATE ONLY)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/279039) in GitLab [Ultimate](https://about.gitlab.com/pricing/) 13.7 as a [Beta feature](https://about.gitlab.com/handbook/product/gitlab-the-product/#beta).
 
@@ -162,4 +162,4 @@ Project details include the following analytics:
 
 - Deployment Frequency
 
-For more information, see [Project Analytics API](../../api/project_analytics.md).
+For more information, see [DORA4 Project Analytics API](../../api/dora4_project_analytics.md).

ee/app/finders/ee/deployments_finder.rb

 # frozen_string_literal: true
 
+# WARNING: This finder does not check permissions!
+#
 # Arguments:
 #   params:
 #     group: Group model - Find deployments within a group (including subgroups)

ee/app/helpers/ee/graph_helper.rb

@@ -7,9 +7,9 @@ module EE
     override :should_render_deployment_frequency_charts
     def should_render_deployment_frequency_charts
       return false unless ::Feature.enabled?(:deployment_frequency_charts, @project, default_enabled: true)
-      return false unless @project.feature_available?(:project_activity_analytics)
+      return false unless @project.feature_available?(:dora4_analytics)
 
-      can?(current_user, :read_project_activity_analytics, @project)
+      can?(current_user, :read_dora4_analytics, @project)
     end
   end
 end

ee/app/models/license.rb

@@ -144,6 +144,7 @@ class License < ApplicationRecord
     dast
     dependency_scanning
     devops_adoption
+    dora4_analytics
     enforce_personal_access_token_expiration
     enforce_ssh_key_expiration
     enterprise_templates
@@ -157,7 +158,6 @@ class License < ApplicationRecord
     jira_issue_association_enforcement
     license_scanning
     personal_access_token_expiration_policy
-    project_activity_analytics
     prometheus_alerts
     pseudonymizer
     quality_management

ee/app/policies/ee/group_policy.rb

@@ -37,6 +37,10 @@ module EE
         @subject.feature_available?(:group_activity_analytics)
       end
 
+      condition(:dora4_analytics_available) do
+        @subject.feature_available?(:dora4_analytics)
+      end
+
       condition(:can_owners_manage_ldap, scope: :global) do
         ::Gitlab::CurrentSettings.allow_group_owners_to_manage_ldap?
       end
@@ -160,6 +164,9 @@ module EE
       rule { has_access & group_activity_analytics_available }
         .enable :read_group_activity_analytics
 
+      rule { reporter & dora4_analytics_available }
+        .enable :read_dora4_analytics
+
       rule { reporter & group_repository_analytics_available }
         .enable :read_group_repository_analytics
 

ee/app/policies/ee/project_policy.rb

@@ -52,8 +52,8 @@ module EE
       end
 
       with_scope :subject
-      condition(:project_activity_analytics_available) do
-        @subject.feature_available?(:project_activity_analytics)
+      condition(:dora4_analytics_available) do
+        @subject.feature_available?(:dora4_analytics)
       end
 
       condition(:project_merge_request_analytics_available) do
@@ -382,8 +382,8 @@ module EE
 
       rule { can?(:read_merge_request) & code_review_analytics_enabled }.enable :read_code_review_analytics
 
-      rule { reporter & project_activity_analytics_available }
-        .enable :read_project_activity_analytics
+      rule { reporter & dora4_analytics_available }
+        .enable :read_dora4_analytics
 
       rule { reporter & project_merge_request_analytics_available }
         .enable :read_project_merge_request_analytics

ee/app/services/analytics/deployments/frequency/aggregate_service.rb

+# frozen_string_literal: true
+
+module Analytics
+  module Deployments
+    module Frequency
+      # This class is to aggregate deployments data at project-level or group-level
+      # for calculating the frequency.
+      class AggregateService < BaseContainerService
+        include Gitlab::Utils::StrongMemoize
+
+        QUARTER_DAYS = 3.months / 1.day
+        INTERVAL_ALL = 'all'
+        INTERVAL_MONTHLY = 'monthly'
+        INTERVAL_DAILY = 'daily'
+        VALID_INTERVALS = [
+          INTERVAL_ALL,
+          INTERVAL_MONTHLY,
+          INTERVAL_DAILY
+        ].freeze
+
+        def execute
+          if error = validate
+            return error
+          end
+
+          frequencies = deployments_grouped.map do |grouped_start_date, grouped_deploys|
+            {
+              value: grouped_deploys.count,
+              from: grouped_start_date,
+              to: deployments_grouped_end_date(grouped_start_date)
+            }
+          end
+
+          success(frequencies: frequencies)
+        end
+
+        private
+
+        def validate
+          unless start_date
+            return error(_("Parameter `from` must be specified"), :bad_request)
+          end
+
+          if start_date > end_date
+            return error(_("Parameter `to` is before the `from` date"), :bad_request)
+          end
+
+          if days_between > QUARTER_DAYS
+            return error(_("Date range is greater than %{quarter_days} days") % { quarter_days: QUARTER_DAYS },
+                         :bad_request)
+          end
+
+          unless VALID_INTERVALS.include?(interval)
+            return error(_("Parameter `interval` must be one of (\"%{valid_intervals}\")") % { valid_intervals: VALID_INTERVALS.join('", "') }, :bad_request)
+          end
+
+          unless can?(current_user, :read_dora4_analytics, container)
+            error(_("You do not have permission to access deployment frequencies"), :forbidden)
+          end
+        end
+
+        def interval
+          params[:interval] || INTERVAL_ALL
+        end
+
+        def start_date
+          params[:from]
+        end
+
+        def end_date
+          strong_memoize(:end_date) do
+            params[:to] || DateTime.current
+          end
+        end
+
+        def days_between
+          (end_date - start_date).to_i
+        end
+
+        def deployments_grouped
+          case interval
+          when INTERVAL_ALL
+            { start_date => deployments }
+          when INTERVAL_MONTHLY
+            deployments.group_by { |d| d.finished_at.beginning_of_month }
+          when INTERVAL_DAILY
+            deployments.group_by { |d| d.finished_at.to_date }
+          end
+        end
+
+        def deployments_grouped_end_date(deployments_grouped_start_date)
+          case interval
+          when INTERVAL_ALL
+            end_date
+          when INTERVAL_MONTHLY
+            deployments_grouped_start_date + 1.month
+          when INTERVAL_DAILY
+            deployments_grouped_start_date + 1.day
+          end
+        end
+
+        def container_params
+          if container.is_a?(Project)
+            { project: container }
+          elsif container.is_a?(Group)
+            { group: container }
+          else
+            {}
+          end
+        end
+
+        def deployments
+          ::DeploymentsFinder.new(
+            **container_params,
+            environment: params[:environment],
+            status: :success,
+            finished_before: end_date,
+            finished_after: start_date,
+            order_by: :finished_at,
+            sort: :asc
+          ).execute
+        end
+      end
+    end
+  end
+end

ee/changelogs/unreleased/group-level-deployment-frequency-api.yml

+---
+title: Adds API support for Group Deployment Frequency
+merge_request: 51938
+author:
+type: added

ee/config/feature_flags/development/dora4_group_deployment_frequency_api.yml

+---
+name: dora4_group_deployment_frequency_api
+introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/51938
+rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/300239
+milestone: '13.9'
+type: development
+group: group::release
+default_enabled: false

ee/lib/api/analytics/group_deployment_frequency.rb

+# frozen_string_literal: true
+
+module API
+  module Analytics
+    class GroupDeploymentFrequency < ::API::Base
+      feature_category :continuous_delivery
+
+      before do
+        authenticate!
+        not_found! unless ::Feature.enabled?(:dora4_group_deployment_frequency_api, user_group)
+      end
+
+      params do
+        requires :id, type: String, desc: 'The ID of the group'
+      end
+
+      resource :groups, requirements: API::NAMESPACE_OR_PROJECT_REQUIREMENTS do
+        namespace ':id/analytics' do
+          desc 'List deployment frequencies for the group'
+
+          params do
+            requires :environment, type: String, desc: 'The name of the environment to filter by'
+            requires :from, type: DateTime, desc: 'Datetime range to start from. Inclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`)'
+            optional :to, type: DateTime, desc: 'Datetime range to end at. Exclusive, ISO 8601 format (`YYYY-MM-DDTHH:MM:SSZ`)'
+            optional :interval, type: String, desc: 'The bucketing interval (`all`, `monthly`, `daily`)'
+          end
+
+          get 'deployment_frequency' do
+            result = ::Analytics::Deployments::Frequency::AggregateService
+              .new(container: user_group,
+                   current_user: current_user,
+                   params: declared_params(include_missing: false))
+              .execute
+
+            unless result[:status] == :success
+              render_api_error!(result[:message], result[:http_status])
+            end
+
+            present result[:frequencies], with: EE::API::Entities::Analytics::DeploymentFrequency
+          end
+        end
+      end
+    end
+  end
+end

ee/lib/api/analytics/project_deployment_frequency.rb

@@ -4,12 +4,11 @@ module API
   module Analytics
     class ProjectDeploymentFrequency < ::API::Base
       include Gitlab::Utils::StrongMemoize
-      include PaginationParams
 
       QUARTER_DAYS = 3.months / 1.day
-      DEPLOYMENT_FREQUENCY_INTERVAL_ALL = 'all'.freeze
-      DEPLOYMENT_FREQUENCY_INTERVAL_MONTHLY = 'monthly'.freeze
-      DEPLOYMENT_FREQUENCY_INTERVAL_DAILY = 'daily'.freeze
+      DEPLOYMENT_FREQUENCY_INTERVAL_ALL = 'all'
+      DEPLOYMENT_FREQUENCY_INTERVAL_MONTHLY = 'monthly'
+      DEPLOYMENT_FREQUENCY_INTERVAL_DAILY = 'daily'
       DEPLOYMENT_FREQUENCY_DEFAULT_INTERVAL = DEPLOYMENT_FREQUENCY_INTERVAL_ALL
       VALID_INTERVALS = [
         DEPLOYMENT_FREQUENCY_INTERVAL_ALL,
@@ -110,7 +109,7 @@ module API
           get 'deployment_frequency' do
             bad_request!("Parameter `to` is before the `from` date") if start_date > end_date
             bad_request!("Date range is greater than #{QUARTER_DAYS} days") if days_between > QUARTER_DAYS
-            authorize! :read_project_activity_analytics, user_project
+            authorize! :read_dora4_analytics, user_project
             present deployment_frequencies, with: EE::API::Entities::Analytics::DeploymentFrequency
           end
         end

ee/lib/ee/api/api.rb

@@ -43,6 +43,7 @@ module EE
         mount ::API::VisualReviewDiscussions
         mount ::API::Analytics::CodeReviewAnalytics
         mount ::API::Analytics::GroupActivityAnalytics
+        mount ::API::Analytics::GroupDeploymentFrequency
         mount ::API::Analytics::ProjectDeploymentFrequency
         mount ::API::ProtectedEnvironments
         mount ::API::ResourceWeightEvents

ee/lib/ee/api/entities/analytics/deployment_frequency.rb

@@ -5,9 +5,11 @@ module EE
     module Entities
       module Analytics
         class DeploymentFrequency < Grape::Entity
+          format_with(:iso8601_date) { |datetime| datetime.to_date.iso8601 }
+
           expose :value
-          expose :from
-          expose :to
+          expose :from, format_with: :iso8601_date
+          expose :to, format_with: :iso8601_date
         end
       end
     end

ee/spec/finders/deployments_finder_spec.rb

@@ -3,18 +3,61 @@
 require 'spec_helper'
 
 RSpec.describe DeploymentsFinder do
-  context 'when filtering by group' do
+  subject { described_class.new(params).execute }
+
+  context 'at group scope' do
     let_it_be(:group) { create(:group) }
     let_it_be(:subgroup) { create(:group, parent: group) }
+    let(:group_project_1) { create(:project, :public, :test_repo, group: group) }
+    let(:group_project_2) { create(:project, :public, :test_repo, group: group) }
+    let(:subgroup_project_1) { create(:project, :public, :test_repo, group: subgroup) }
+    let(:base_params) { { group: group } }
+
+    describe 'ordering' do
+      using RSpec::Parameterized::TableSyntax
+
+      let(:params) { { **base_params, order_by: order_by, sort: sort } }
+
+      let!(:group_project_1_deployment) { create(:deployment, :success, project: group_project_1, iid: 11, ref: 'master', created_at: 2.days.ago, updated_at: Time.now, finished_at: Time.now) }
+      let!(:group_project_2_deployment) { create(:deployment, :success, project: group_project_2, iid: 12, ref: 'feature', created_at: 1.day.ago, updated_at: 2.hours.ago, finished_at: 2.hours.ago) }
+      let!(:subgroup_project_1_deployment) { create(:deployment, :success, project: subgroup_project_1, iid: 8, ref: 'video', created_at: Time.now, updated_at: 1.hour.ago, finished_at: 1.hour.ago) }
+
+      where(:order_by, :sort) do
+        'created_at'  | 'asc'
+        'created_at'  | 'desc'
+        'id'          | 'asc'
+        'id'          | 'desc'
+        'iid'         | 'asc'
+        'iid'         | 'desc'
+        'ref'         | 'asc'
+        'ref'         | 'desc'
+        'updated_at'  | 'asc'
+        'updated_at'  | 'desc'
+        'finished_at' | 'asc'
+        'finished_at' | 'desc'
+        'invalid'     | 'asc'
+        'iid'         | 'err'
+      end
 
-    let_it_be(:project_in_group) { create(:project, :repository, group: group) }
-    let_it_be(:project_in_subgroup) { create(:project, :repository, group: subgroup) }
+      with_them do
+        it 'returns the deployments unordered' do
+          expect(subject.to_a).to contain_exactly(group_project_1_deployment,
+                                                  group_project_2_deployment,
+                                                  subgroup_project_1_deployment)
+        end
+      end
+    end
 
-    let_it_be(:deployment_in_group) { create(:deployment, status: :success, project: project_in_group) }
-    let_it_be(:deployment_in_subgroup) { create(:deployment, status: :success, project: project_in_subgroup) }
+    it 'avoids N+1 queries' do
+      execute_queries = -> { described_class.new({ group: group }).execute.first }
+      control_count = ActiveRecord::QueryRecorder.new { execute_queries }.count
 
-    subject { described_class.new(group: group).execute }
+      new_project = create(:project, :repository, group: group)
+      new_env = create(:environment, project: new_project, name: "production")
+      create_list(:deployment, 2, status: :success, project: new_project, environment: new_env)
+      group.reload
 
-    it { is_expected.to match_array([deployment_in_group, deployment_in_subgroup]) }
+      expect { execute_queries }.not_to exceed_query_limit(control_count)
+    end
   end
 end

ee/spec/frontend/fixtures/analytics/project_analytics.rb

@@ -30,7 +30,7 @@ RSpec.describe 'Project Analytics (JavaScript fixtures)' do
   end
 
   before do
-    stub_licensed_features(project_activity_analytics: true)
+    stub_licensed_features(dora4_analytics: true)
     project.add_reporter(reporter)
     sign_in(reporter)
   end

ee/spec/helpers/ee/graph_helper_spec.rb

@@ -12,11 +12,11 @@ RSpec.describe EE::GraphHelper do
     let(:is_user_authorized) { true }
 
     before do
-      stub_licensed_features(project_activity_analytics: is_feature_licensed)
+      stub_licensed_features(dora4_analytics: is_feature_licensed)
       stub_feature_flags(deployment_frequency_charts: is_flag_enabled)
       self.instance_variable_set(:@current_user, current_user)
       self.instance_variable_set(:@project, project)
-      allow(self).to receive(:can?).with(current_user, :read_project_activity_analytics, project).and_return(is_user_authorized)
+      allow(self).to receive(:can?).with(current_user, :read_dora4_analytics, project).and_return(is_user_authorized)
     end
 
     shared_examples 'returns true' do

ee/spec/policies/group_policy_spec.rb

@@ -184,6 +184,26 @@ RSpec.describe GroupPolicy do
     it { is_expected.not_to be_allowed(:read_group_contribution_analytics) }
   end
 
+  context 'when dora4 analytics is available' do
+    let(:current_user) { developer }
+
+    before do
+      stub_licensed_features(dora4_analytics: true)
+    end
+
+    it { is_expected.to be_allowed(:read_dora4_analytics) }
+  end
+
+  context 'when dora4 analytics is not available' do
+    let(:current_user) { developer }
+
+    before do
+      stub_licensed_features(dora4_analytics: false)
+    end
+
+    it { is_expected.not_to be_allowed(:read_dora4_analytics) }
+  end
+
   context 'when group activity analytics is available' do
     let(:current_user) { developer }
 

ee/spec/policies/project_policy_spec.rb

@@ -1388,24 +1388,24 @@ RSpec.describe ProjectPolicy do
     it { is_expected.to be_disallowed(:read_group_timelogs) }
   end
 
-  context 'when project activity analytics is available' do
+  context 'when dora4 analytics is available' do
     let(:current_user) { developer }
 
     before do
-      stub_licensed_features(project_activity_analytics: true)
+      stub_licensed_features(dora4_analytics: true)
     end
 
-    it { is_expected.to be_allowed(:read_project_activity_analytics) }
+    it { is_expected.to be_allowed(:read_dora4_analytics) }
   end
 
-  context 'when project activity analytics is not available' do
+  context 'when dora4 analytics is not available' do
     let(:current_user) { developer }
 
     before do
-      stub_licensed_features(project_activity_analytics: false)
+      stub_licensed_features(dora4_analytics: false)
     end
 
-    it { is_expected.not_to be_allowed(:read_project_activity_analytics) }
+    it { is_expected.not_to be_allowed(:read_dora4_analytics) }
   end
 
   describe ':read_code_review_analytics' do

ee/spec/requests/api/analytics/group_deployment_frequency_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe API::Analytics::GroupDeploymentFrequency do
+  let_it_be(:group) { create(:group, :private) }
+  let_it_be(:project1) { create(:project, :repository, namespace: group) }
+  let_it_be(:project2) { create(:project, :repository, namespace: group) }
+  let_it_be(:prod_env_name) { "prod" }
+  let_it_be(:prod1) { create(:environment, project: project1, name: prod_env_name) }
+  let_it_be(:dev1) { create(:environment, project: project1, name: "dev") }
+  let_it_be(:prod2) { create(:environment, project: project2, name: prod_env_name) }
+  let_it_be(:dev2) { create(:environment, project: project2, name: "dev") }
+  let_it_be(:anonymous_user) { create(:user) }
+  let_it_be(:reporter) { create(:user).tap { |u| group.add_reporter(u) } }
+
+  def make_deployment(finished_at, env, proj)
+    create(:deployment,
+           status: :success,
+           project: proj,
+           environment: env,
+           finished_at: finished_at)
+  end
+
+  let_it_be(:deployment_2020_01_01) { make_deployment(DateTime.new(2020, 1, 1), prod1, project1) }
+  let_it_be(:deployment_2020_01_02) { make_deployment(DateTime.new(2020, 1, 2), prod2, project2) }
+  let_it_be(:deployment_2020_01_03) { make_deployment(DateTime.new(2020, 1, 3), dev1, project1) }
+  let_it_be(:deployment_2020_01_04) { make_deployment(DateTime.new(2020, 1, 4), prod2, project2) }
+  let_it_be(:deployment_2020_01_05) { make_deployment(DateTime.new(2020, 1, 5), prod1, project1) }
+
+  let_it_be(:deployment_2020_02_01) { make_deployment(DateTime.new(2020, 2, 1), prod2, project2) }
+  let_it_be(:deployment_2020_02_02) { make_deployment(DateTime.new(2020, 2, 2), prod1, project1) }
+  let_it_be(:deployment_2020_02_03) { make_deployment(DateTime.new(2020, 2, 3), dev2, project2) }
+  let_it_be(:deployment_2020_02_04) { make_deployment(DateTime.new(2020, 2, 4), prod1, project1) }
+  let_it_be(:deployment_2020_02_05) { make_deployment(DateTime.new(2020, 2, 5), prod2, project2) }
+
+  let_it_be(:deployment_2020_03_01) { make_deployment(DateTime.new(2020, 3, 1), prod1, project1) }
+  let_it_be(:deployment_2020_03_02) { make_deployment(DateTime.new(2020, 3, 2), prod2, project2) }
+  let_it_be(:deployment_2020_03_03) { make_deployment(DateTime.new(2020, 3, 3), dev1, project1) }
+  let_it_be(:deployment_2020_03_04) { make_deployment(DateTime.new(2020, 3, 4), prod2, project2) }
+  let_it_be(:deployment_2020_03_05) { make_deployment(DateTime.new(2020, 3, 5), prod1, project1) }
+
+  let_it_be(:deployment_2020_04_01) { make_deployment(DateTime.new(2020, 4, 1), prod2, project2) }
+  let_it_be(:deployment_2020_04_02) { make_deployment(DateTime.new(2020, 4, 2), prod1, project1) }
+  let_it_be(:deployment_2020_04_03) { make_deployment(DateTime.new(2020, 4, 3), dev2, project2) }
+  let_it_be(:deployment_2020_04_04) { make_deployment(DateTime.new(2020, 4, 4), prod1, project1) }
+  let_it_be(:deployment_2020_04_05) { make_deployment(DateTime.new(2020, 4, 5), prod2, project2) }
+
+  let(:dora4_analytics_enabled) { true }
+  let(:api_feature_flag_enabled) { true }
+  let(:current_user) { reporter }
+  let(:params) { { from: 1.day.ago, to: Time.now, interval: "all", environment: prod_env_name } }
+  let(:path) { api("/groups/#{group.id}/analytics/deployment_frequency", current_user) }
+  let(:request) { get path, params: params }
+  let(:request_time) { nil }
+
+  before do
+    stub_licensed_features(dora4_analytics: dora4_analytics_enabled)
+    stub_feature_flags(dora4_group_deployment_frequency_api: api_feature_flag_enabled)
+
+    if request_time
+      travel_to(request_time) { request }
+    else
+      request
+    end
+  end
+
+  context 'when user has access to the group' do
+    it 'returns `ok`' do
+      expect(response).to have_gitlab_http_status(:ok)
+    end
+  end
+
+  context 'with params: from 2017 to 2019' do
+    let(:params) { { environment: prod_env_name, from: DateTime.new(2017), to: DateTime.new(2019) } }
+
+    it 'returns `bad_request` with expected message' do
+      expect(response.parsed_body).to eq({
+        "message" => "Date range is greater than 91 days"
+      })
+    end
+  end
+
+  context 'with params: from 2019 to 2017' do
+    let(:params) do
+      { environment: prod_env_name, from: DateTime.new(2019), to: DateTime.new(2017) }
+    end
+
+    it 'returns `bad_request` with expected message' do
+      expect(response.parsed_body).to eq({
+        "message" => "Parameter `to` is before the `from` date"
+      })
+    end
+  end
+
+  context 'with params: from 2020/04/02 to request time' do
+    let(:request_time) { DateTime.new(2020, 4, 4) }
+    let(:params) { { environment: prod_env_name, from: DateTime.new(2020, 4, 2) } }
+
+    it 'returns the expected deployment frequencies' do
+      expect(response.parsed_body).to eq([{
+        "from" => "2020-04-02",
+        "to" => "2020-04-04",
+        "value" => 1
+      }])
+    end
+  end
+
+  context 'with params: from 2020/02/01 to 2020/04/01 by all' do
+    let(:params) do
+      {
+        environment: prod_env_name,
+        from: DateTime.new(2020, 2, 1),
+        to: DateTime.new(2020, 4, 1),
+        interval: "all"
+      }
+    end
+
+    it 'returns the expected deployment frequencies' do
+      expect(response.parsed_body).to eq([{
+          "from" => "2020-02-01",
+          "to" => "2020-04-01",
+          "value" => 8
+        }])
+    end
+  end
+
+  context 'with params: from 2020/02/01 to 2020/04/01 by month' do
+    let(:params) do
+      {
+        environment: prod_env_name,
+        from: DateTime.new(2020, 2, 1),
+        to: DateTime.new(2020, 4, 1),
+        interval: "monthly"
+      }
+    end
+
+    it 'returns the expected deployment frequencies' do
+      expect(response.parsed_body).to eq([
+        { "from" => "2020-02-01", "to" => "2020-03-01", "value" => 4 },
+        { "from" => "2020-03-01", "to" => "2020-04-01", "value" => 4 }
+      ])
+    end
+  end
+
+  context 'with params: from 2020/02/01 to 2020/04/01 by day' do
+    let(:params) do
+      {
+        environment: prod_env_name,
+        from: DateTime.new(2020, 2, 1),
+        to: DateTime.new(2020, 4, 1),
+        interval: "daily"
+      }
+    end
+
+    it 'returns the expected deployment frequencies' do
+      expect(response.parsed_body).to eq([
+        { "from" => "2020-02-01", "to" => "2020-02-02", "value" => 1 },
+        { "from" => "2020-02-02", "to" => "2020-02-03", "value" => 1 },
+        { "from" => "2020-02-04", "to" => "2020-02-05", "value" => 1 },
+        { "from" => "2020-02-05", "to" => "2020-02-06", "value" => 1 },
+        { "from" => "2020-03-01", "to" => "2020-03-02", "value" => 1 },
+        { "from" => "2020-03-02", "to" => "2020-03-03", "value" => 1 },
+        { "from" => "2020-03-04", "to" => "2020-03-05", "value" => 1 },
+        { "from" => "2020-03-05", "to" => "2020-03-06", "value" => 1 }
+      ])
+    end
+  end
+
+  context 'with params: invalid interval' do
+    let(:params) do
+      {
+        environment: prod_env_name,
+        from: DateTime.new(2020, 1),
+        to: DateTime.new(2020, 2),
+        interval: "invalid"
+      }
+    end
+
+    it 'returns `bad_request`' do
+      expect(response).to have_gitlab_http_status(:bad_request)
+    end
+  end
+
+  context 'with params: missing from' do
+    let(:params) { { environment: prod_env_name, to: DateTime.new(2019), interval: "all" } }
+
+    it 'returns `bad_request`' do
+      expect(response).to have_gitlab_http_status(:bad_request)
+    end
+  end
+
+  context 'when user does not have access to the group' do
+    let(:current_user) { anonymous_user }
+
+    it 'returns `not_found`' do
+      expect(response).to have_gitlab_http_status(:not_found)
+    end
+  end
+
+  context 'when feature is not available in plan' do
+    let(:dora4_analytics_enabled) { false }
+
+    context 'when user has access to the group' do
+      it 'returns `forbidden`' do
+        expect(response).to have_gitlab_http_status(:forbidden)
+      end
+    end
+
+    context 'when user does not have access to the group' do
+      let(:current_user) { anonymous_user }
+
+      it 'returns `not_found`' do
+        expect(response).to have_gitlab_http_status(:not_found)
+      end
+    end
+  end
+
+  context 'when feature flag dora4_group_deployment_frequency_api is disabled' do
+    let(:api_feature_flag_enabled) { false }
+
+    context 'when user has access to the group' do
+      it 'returns `not_found`' do
+        expect(response).to have_gitlab_http_status(:not_found)
+      end
+    end
+  end
+end

ee/spec/requests/api/analytics/project_deployment_frequency_spec.rb

@@ -42,7 +42,7 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
   let_it_be(:deployment_2020_04_04) { make_deployment(DateTime.new(2020, 4, 4), prod) }
   let_it_be(:deployment_2020_04_05) { make_deployment(DateTime.new(2020, 4, 5), prod) }
 
-  let(:project_activity_analytics_enabled) { true }
+  let(:dora4_analytics_enabled) { true }
   let(:current_user) { reporter }
   let(:params) { { from: Time.now, to: Time.now, interval: "all", environment: prod.name } }
   let(:path) { api("/projects/#{project.id}/analytics/deployment_frequency", current_user) }
@@ -50,7 +50,7 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
   let(:request_time) { nil }
 
   before do
-    stub_licensed_features(project_activity_analytics: project_activity_analytics_enabled)
+    stub_licensed_features(dora4_analytics: dora4_analytics_enabled)
 
     if request_time
       travel_to(request_time) { request }
@@ -87,14 +87,14 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
     end
   end
 
-  context 'with params: from 2020/04/01 to request time' do
+  context 'with params: from 2020/04/02 to request time' do
     let(:request_time) { DateTime.new(2020, 4, 4) }
     let(:params) { { environment: prod.name, from: DateTime.new(2020, 4, 2) } }
 
     it 'returns the expected deployment frequencies' do
       expect(response.parsed_body).to eq([{
-        "from" => "2020-04-02T00:00:00.000+00:00",
-        "to" => "2020-04-04T00:00:00.000+00:00",
+        "from" => "2020-04-02",
+        "to" => "2020-04-04",
         "value" => 1
       }])
     end
@@ -112,8 +112,8 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
 
     it 'returns the expected deployment frequencies' do
       expect(response.parsed_body).to eq([{
-          "from" => "2020-02-01T00:00:00.000+00:00",
-          "to" => "2020-04-01T00:00:00.000+00:00",
+          "from" => "2020-02-01",
+          "to" => "2020-04-01",
           "value" => 8
         }])
     end
@@ -131,13 +131,13 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
 
     it 'returns the expected deployment frequencies' do
       expect(response.parsed_body).to eq([
-        { "from" => "2020-02-01T00:00:00.000Z", "to" => "2020-03-01T00:00:00.000Z", "value" => 4 },
-        { "from" => "2020-03-01T00:00:00.000Z", "to" => "2020-04-01T00:00:00.000Z", "value" => 4 }
+        { "from" => "2020-02-01", "to" => "2020-03-01", "value" => 4 },
+        { "from" => "2020-03-01", "to" => "2020-04-01", "value" => 4 }
       ])
     end
   end
 
-  context 'with params: from 2017 to 2019 by day' do
+  context 'with params: from 2020/02/01 to 2020/04/01 by day' do
     let(:params) do
       {
         environment: prod.name,
@@ -193,7 +193,7 @@ RSpec.describe API::Analytics::ProjectDeploymentFrequency do
   end
 
   context 'when feature is not available in plan' do
-    let(:project_activity_analytics_enabled) { false }
+    let(:dora4_analytics_enabled) { false }
 
     context 'when user has access to the project' do
       it 'returns `forbidden`' do

ee/spec/services/analytics/deployments/frequency/aggregate_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Analytics::Deployments::Frequency::AggregateService do
+  let_it_be(:group) { create(:group) }
+  let_it_be(:subgroup) { create(:group, parent: group) }
+  let_it_be(:group_project, refind: true) { create(:project, :repository, group: group) }
+  let_it_be(:subgroup_project, refind: true) { create(:project, :repository, group: subgroup) }
+  let_it_be(:developer) { create(:user) }
+  let_it_be(:guest) { create(:user) }
+  let(:container) { group_project }
+  let(:actor) { developer }
+  let(:service) { described_class.new(container: container, current_user: actor, params: params) }
+  let(:params) { { from: 4.days.ago.to_datetime } }
+
+  before_all do
+    group.add_developer(developer)
+    group.add_guest(guest)
+  end
+
+  before do
+    stub_licensed_features(dora4_analytics: true)
+  end
+
+  around do |example|
+    freeze_time { example.run }
+  end
+
+  describe '#execute' do
+    subject { service.execute }
+
+    let_it_be(:group_production) { create(:environment, project: group_project, name: 'production') }
+    let_it_be(:group_staging) { create(:environment, project: group_project, name: 'staging') }
+    let_it_be(:subgroup_production) { create(:environment, project: subgroup_project, name: 'production') }
+    let_it_be(:subgroup_staging) { create(:environment, project: subgroup_project, name: 'staging') }
+
+    before_all do
+      create(:deployment, :success, project: group_project, environment: group_production, finished_at: 7.days.ago)
+      create(:deployment, :failed,  project: group_project, environment: group_production, finished_at: 3.days.ago)
+      create(:deployment, :success, project: group_project, environment: group_production, finished_at: 1.day.ago)
+      create(:deployment, :success, project: group_project, environment: group_staging,    finished_at: 1.day.ago)
+
+      create(:deployment, :success, project: subgroup_project, environment: subgroup_production, finished_at: 7.days.ago)
+      create(:deployment, :failed,  project: subgroup_project, environment: subgroup_production, finished_at: 3.days.ago)
+      create(:deployment, :success, project: subgroup_project, environment: subgroup_production, finished_at: 1.day.ago)
+      create(:deployment, :success, project: subgroup_project, environment: subgroup_staging,    finished_at: 1.day.ago)
+    end
+
+    shared_examples_for 'validation error' do
+      it 'returns an error with message' do
+        result = subject
+
+        expect(result[:status]).to eq(:error)
+        expect(result[:message]).to eq(message)
+      end
+    end
+
+    it 'returns deployment frequencies' do
+      result = subject
+
+      expect(result[:status]).to eq(:success)
+      expect(result[:frequencies]).to eq(
+        [
+          {
+            from: params[:from],
+            to: DateTime.current,
+            value: 2
+          }
+        ]
+      )
+    end
+
+    context 'when date range is specified' do
+      let(:params) { { from: 10.days.ago.to_datetime, to: 5.days.from_now.to_datetime } }
+
+      it 'returns deployment frequencies' do
+        result = subject
+
+        expect(result[:status]).to eq(:success)
+        expect(result[:frequencies]).to eq(
+          [
+            {
+              from: params[:from],
+              to: params[:to],
+              value: 3
+            }
+          ]
+        )
+      end
+    end
+
+    context 'when environment name is specified' do
+      let(:params) { { from: 3.days.ago.to_datetime, environment: 'production' } }
+
+      it 'returns frequencies that related to production environment' do
+        result = subject
+
+        expect(result[:status]).to eq(:success)
+        expect(result[:frequencies]).to eq(
+          [
+            {
+              from: params[:from],
+              to: DateTime.current,
+              value: 1
+            }
+          ]
+        )
+      end
+    end
+
+    context 'when the container is group' do
+      let(:container) { group }
+
+      it 'returns frequencies that related to production environment' do
+        result = subject
+
+        expect(result[:status]).to eq(:success)
+        expect(result[:frequencies]).to eq(
+          [
+            {
+              from: params[:from],
+              to: DateTime.current,
+              value: 4
+            }
+          ]
+        )
+      end
+    end
+
+    context 'when parameter is empty' do
+      let(:params) { {} }
+
+      it_behaves_like 'validation error' do
+        let(:message) { 'Parameter `from` must be specified' }
+      end
+    end
+
+    context 'when start_date is eariler than end_date' do
+      let(:params) { { from: 3.days.ago.to_datetime, to: 4.days.ago.to_datetime } }
+
+      it_behaves_like 'validation error' do
+        let(:message) { 'Parameter `to` is before the `from` date' }
+      end
+    end
+
+    context 'when the date range is too broad' do
+      let(:params) { { from: 1.year.ago.to_datetime } }
+
+      it_behaves_like 'validation error' do
+        let(:message) { 'Date range is greater than 91 days' }
+      end
+    end
+
+    context 'when the interval is not supported' do
+      let(:params) { { from: 3.days.ago.to_datetime, interval: 'unknown' } }
+
+      it_behaves_like 'validation error' do
+        let(:message) { 'Parameter `interval` must be one of ("all", "monthly", "daily")' }
+      end
+    end
+
+    context 'when the actor does not have permission to read DORA4 metrics' do
+      let(:actor) { guest }
+
+      it_behaves_like 'validation error' do
+        let(:message) { 'You do not have permission to access deployment frequencies' }
+      end
+    end
+
+    context 'when license is insufficient' do
+      before do
+        stub_licensed_features(dora4_analytics: false)
+      end
+
+      it_behaves_like 'validation error' do
+        let(:message) { 'You do not have permission to access deployment frequencies' }
+      end
+    end
+  end
+end

locale/gitlab.pot

@@ -9406,6 +9406,9 @@ msgstr ""
 msgid "Date range cannot exceed %{maxDateRange} days."
 msgstr ""
 
+msgid "Date range is greater than %{quarter_days} days"
+msgstr ""
+
 msgid "Day of month"
 msgstr ""
 
@@ -21345,6 +21348,15 @@ msgstr ""
 msgid "Parameter \"job_id\" cannot exceed length of %{job_id_max_size}"
 msgstr ""
 
+msgid "Parameter `from` must be specified"
+msgstr ""
+
+msgid "Parameter `interval` must be one of (\"%{valid_intervals}\")"
+msgstr ""
+
+msgid "Parameter `to` is before the `from` date"
+msgstr ""
+
 msgid "Parent"
 msgstr ""
 
@@ -33532,6 +33544,9 @@ msgstr ""
 msgid "You do not have any subscriptions yet"
 msgstr ""
 
+msgid "You do not have permission to access deployment frequencies"
+msgstr ""
+
 msgid "You do not have permission to leave this %{namespaceType}."
 msgstr ""
 

spec/models/deployment_spec.rb

@@ -396,6 +396,26 @@ RSpec.describe Deployment do
       end
     end
 
+    describe '.finished_before' do
+      let!(:deployment1) { create(:deployment, finished_at: 1.day.ago) }
+      let!(:deployment2) { create(:deployment, finished_at: Time.current) }
+
+      it 'filters deployments by finished_at' do
+        expect(described_class.finished_before(1.hour.ago))
+          .to eq([deployment1])
+      end
+    end
+
+    describe '.finished_after' do
+      let!(:deployment1) { create(:deployment, finished_at: 1.day.ago) }
+      let!(:deployment2) { create(:deployment, finished_at: Time.current) }
+
+      it 'filters deployments by finished_at' do
+        expect(described_class.finished_after(1.hour.ago))
+          .to eq([deployment2])
+      end
+    end
+
     describe 'with_deployable' do
       subject { described_class.with_deployable }
 
@@ -408,22 +428,6 @@ RSpec.describe Deployment do
       end
     end
 
-    describe 'finished_between' do
-      subject { described_class.finished_between(start_time, end_time) }
-
-      let_it_be(:start_time) { DateTime.new(2017) }
-      let_it_be(:end_time) { DateTime.new(2019) }
-      let_it_be(:deployment_2016) { create(:deployment, finished_at: DateTime.new(2016)) }
-      let_it_be(:deployment_2017) { create(:deployment, finished_at: DateTime.new(2017)) }
-      let_it_be(:deployment_2018) { create(:deployment, finished_at: DateTime.new(2018)) }
-      let_it_be(:deployment_2019) { create(:deployment, finished_at: DateTime.new(2019)) }
-      let_it_be(:deployment_2020) { create(:deployment, finished_at: DateTime.new(2020)) }
-
-      it 'retrieves deployments that finished between the specified times' do
-        is_expected.to contain_exactly(deployment_2017, deployment_2018)
-      end
-    end
-
     describe 'visible' do
       subject { described_class.visible }