**app/models/deployment.rb:**
Select deployments that were created within a datetime range.

**ee/app/finders/analytics/deployments_finder.rb:**
Find successful deployments for a project within a datetime range.

**ee/changelogs/unreleased/api-support-for-deployment-frequency.yml:**
Changelog.

**ee/lib/api/analytics/project_deployment_frequency.rb:**
API for getting deployment frequencies for projects.

**ee/lib/ee/api/api.rb:**
Mount the new deployment frequency API.

**ee/lib/ee/api/entities/analytics/deployment_frequency.rb:**
Shape of deployment frequency API responses.

**ee/spec/requests/api/analytics/project_deployment_frequency_spec.rb:**
Test API.

**ee/spec/finders/analytics/deployments_finder_spec.rb:**
Test deployments finder.

**spec/models/deployment_spec.rb:**
Test created_between method.

**doc/user/project/index.md:**
Adds some docs for the new licensed feature flag.

**doc/api/project_analytics.md:**
Adds some docs for the API.

**ee/app/models/license.rb:**
Adds new licensed feature flag for project analytics.

**ee/app/policies/ee/project_policy.rb:**
Adds new policies for the new project analytics feature flag.

**ee/spec/policies/project_policy_spec.rb:**
Test for new project analytics policy and feature flag.

**db/structure.sql:**
**db/migrate/
20201211042306_add_deployments_finder_by_finished_at_index.rb:**
**db/schema_migrations/20201211042306:**

Adding new index to make the deployments finder query fast.