Add documentation for Daily DORA metrics

This commit adds the documenattion for the
Daily DORA metrics that added in GitLab 13.10.

changelogs/unreleased/docs-daily-dora-metrics.yml

+---
+title: Support daily DORA metrics API
+merge_request: 56080
+author:
+type: added

config/feature_flags/development/dora_daily_metrics.yml

----
-name: dora_daily_metrics
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/55473
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/291746
-milestone: '13.10'
-type: development
-group: group::release
-default_enabled: false

doc/api/dora/metrics.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
+---
+
+# DevOps Research and Assessment (DORA) key metrics API **(ULTIMATE)**
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/279039) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 13.10.
+
+All methods require [reporter permissions and above](../../user/permissions.md).
+
+## Get project-level DORA metrics
+
+Get project-level DORA metrics.
+
+```plaintext
+GET /projects/:id/dora/metrics
+```
+
+| Attribute          | Type           | Required | Description                      |
+|--------------      |--------        |----------|-----------------------           |
+| `id`               | integer/string | yes      | The ID or [URL-encoded path of the project](../README.md#namespaced-path-encoding) can be accessed by the authenticated user. |
+| `metric`           | string         | yes      | The [metric name](../../user/analytics/ci_cd_analytics.md#supported-metrics-in-gitlab). One of `deployment_frequency` or `lead_time_for_changes`.  |
+| `start_date`       | string         | no       | Date range to start from. ISO 8601 Date format, for example `2021-03-01`. Default is 3 months ago. |
+| `end_date`         | string         | no       | Date range to end at. ISO 8601 Date format, for example `2021-03-01`. Default is the current date. |
+| `interval`         | string         | no       | The bucketing interval. One of `all`, `monthly` or `daily`. Default is `daily`.   |
+| `environment_tier` | string         | no       | The [tier of the environment](../../ci/environments/index.md#deployment-tier-of-environments). Default is `production`.                     |
+
+Example request:
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/projects/1/dora/metrics?metric=deployment_frequency"
+```
+
+Example response:
+
+```json
+[
+  { "2021-03-01": 3 },
+  { "2021-03-02": 6 },
+  { "2021-03-03": 0 },
+  { "2021-03-04": 0 },
+  { "2021-03-05": 0 },
+  { "2021-03-06": 0 },
+  { "2021-03-07": 0 },
+  { "2021-03-08": 4 }
+]
+```
+
+## Get group-level DORA metrics
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/279039) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 13.10.
+
+Get group-level DORA metrics.
+
+```plaintext
+GET /groups/:id/dora/metrics
+```
+
+| Attribute          | Type           | Required | Description                      |
+|--------------      |--------        |----------|-----------------------           |
+| `id`               | integer/string | yes      | The ID or [URL-encoded path of the project](../README.md#namespaced-path-encoding) can be accessed by the authenticated user. |
+| `metric`           | string         | yes      | The [metric name](../../user/analytics/ci_cd_analytics.md#supported-metrics-in-gitlab). One of `deployment_frequency` or `lead_time_for_changes`.  |
+| `start_date`       | string         | no       | Date range to start from. ISO 8601 Date format, for example `2021-03-01`. Default is 3 months ago. |
+| `end_date`         | string         | no       | Date range to end at. ISO 8601 Date format, for example `2021-03-01`. Default is the current date. |
+| `interval`         | string         | no       | The bucketing interval. One of `all`, `monthly` or `daily`. Default is `daily`.   |
+| `environment_tier` | string         | no       | The [tier of the environment](../../ci/environments/index.md#deployment-tier-of-environments). Default is `production`.                     |
+
+Example request:
+
+```shell
+curl --header "PRIVATE-TOKEN: <your_access_token>" "https://gitlab.example.com/api/v4/groups/1/dora/metrics?metric=deployment_frequency"
+```
+
+Example response:
+
+```json
+[
+  { "2021-03-01": 3 },
+  { "2021-03-02": 6 },
+  { "2021-03-03": 0 },
+  { "2021-03-04": 0 },
+  { "2021-03-05": 0 },
+  { "2021-03-06": 0 },
+  { "2021-03-07": 0 },
+  { "2021-03-08": 4 }
+]
+```

doc/user/analytics/ci_cd_analytics.md

@@ -22,7 +22,10 @@ View pipeline duration history:
 
 ![Pipeline duration](img/pipelines_duration_chart.png)
 
-## DORA4 Metrics
+## DevOps Research and Assessment (DORA) key metrics **(ULTIMATE)**
+
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/275991) in GitLab 13.7.
+> - Added support for [lead time for changes](https://gitlab.com/gitlab-org/gitlab/-/issues/291746) in GitLab 13.10.
 
 Customer experience is a key metric. Users want to measure platform stability and other
 post-deployment performance KPIs, and set targets for customer behavior, experience, and financial
@@ -41,9 +44,18 @@ performance indicators for software development teams:
 - Time to restore service: How long it takes an organization to recover from a failure in
   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 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).
+### Supported metrics in GitLab
+
+The following table shows the supported metrics, at which level they are supported, and which GitLab version (API and UI) they were introduced:
+
+| Metric           | Level               | API version                                | Chart (UI) version                                     | Comments                                                                               |
+| --------------- | -----------               | ---------------                      | ----------                                      | -------                                                                               |
+| `deployment_frequency`    | Project-level       | [13.7+](../../api/dora/metrics.md)  | [13.8+](#deployment-frequency-charts) | The [old API endopint](../../api/dora4_project_analytics.md) was [deprecated](https://gitlab.com/gitlab-org/gitlab/-/issues/323713) in 13.10. |
+| `deployment_frequency`    | Group-level     | [13.10+](../../api/dora/metrics.md) | To be supported  |                                                                                       |
+| `lead_time_for_changes`   | Project-level      | [13.10+](../../api/dora/metrics.md) | To be supported  | Unit in seconds. Aggregation method is median.                                                                    |
+| `lead_time_for_changes`   | Group-level     |  [13.10+](../../api/dora/metrics.md) | To be supported  | Unit in seconds. Aggregation method is median.                                                                    |
+| `change_failure_rate`     | Project/Group-level   |  To be supported                      | To be supported  |                                                                                       |
+| `time_to_restore_service` | Project/Group-level   |  To be supported                      | To be supported  |                                                                                       |
 
 ## Deployment frequency charts **(ULTIMATE)**
 

doc/user/permissions.md

@@ -87,6 +87,7 @@ The following table depicts the various user permission levels in a project.
 | See a commit status                               |         | ✓          | ✓           | ✓        | ✓      |
 | See a container registry                          |         | ✓          | ✓           | ✓        | ✓      |
 | See environments                                  |         | ✓          | ✓           | ✓        | ✓      |
+| See [DORA metrics](analytics/ci_cd_analytics.md)  |         | ✓          | ✓           | ✓        | ✓      |
 | See a list of merge requests                      |         | ✓          | ✓           | ✓        | ✓      |
 | View CI/CD analytics                              |         | ✓          | ✓           | ✓        | ✓      |
 | View Code Review analytics **(STARTER)**          |         | ✓          | ✓           | ✓        | ✓      |

ee/app/models/ee/deployment.rb

@@ -13,8 +13,6 @@ module EE
 
       state_machine :status do
         after_transition any => :success do |deployment|
-          next unless ::Feature.enabled?(:dora_daily_metrics, deployment.project, default_enabled: :yaml)
-
           deployment.run_after_commit do
             # Schedule to refresh the DORA daily metrics.
             # It has 5 minutes delay due to waiting for the other async processes

ee/lib/api/dora/metrics.rb

@@ -15,8 +15,6 @@ module API
         end
 
         def fetch!(container)
-          not_found! unless ::Feature.enabled?(:dora_daily_metrics, container, default_enabled: :yaml)
-
           result = ::Dora::AggregateMetricsService
             .new(container: container, current_user: current_user, params: declared_params(include_missing: false))
             .execute

ee/spec/models/deployment_spec.rb

@@ -18,18 +18,6 @@ RSpec.describe Deployment do
           deployment.succeed!
         end
       end
-
-      context 'when dora_daily_metrics feature flag is disabled' do
-        before do
-          stub_feature_flags(dora_daily_metrics: false)
-        end
-
-        it 'does not schedule Dora::DailyMetrics::RefreshWorker' do
-          expect(::Dora::DailyMetrics::RefreshWorker).not_to receive(:perform_in)
-
-          deployment.succeed!
-        end
-      end
     end
   end
 end

ee/spec/requests/api/dora/metrics_spec.rb

@@ -49,18 +49,6 @@ RSpec.describe API::Dora::Metrics do
         expect(json_response['message']).to eq('You do not have permission to access dora metrics.')
       end
     end
-
-    context 'when dora_daily_metrics feature flag is disabled' do
-      before do
-        stub_feature_flags(dora_daily_metrics: false)
-      end
-
-      it 'returns not found' do
-        subject
-
-        expect(response).to have_gitlab_http_status(:not_found)
-      end
-    end
   end
 
   describe 'GET /groups/:id/dora/metrics' do
@@ -110,17 +98,5 @@ RSpec.describe API::Dora::Metrics do
         expect(json_response['message']).to eq('You do not have permission to access dora metrics.')
       end
     end
-
-    context 'when dora_daily_metrics feature flag is disabled' do
-      before do
-        stub_feature_flags(dora_daily_metrics: false)
-      end
-
-      it 'returns not found' do
-        subject
-
-        expect(response).to have_gitlab_http_status(:not_found)
-      end
-    end
   end
 end