diff --git a/app/serializers/deployment_entity.rb b/app/serializers/deployment_entity.rb
index 7a2fba73f3ac9f26b9ef694b82427916699422cc..020c66af777a580cfbe7bb78e08f539b4870faa1 100644
--- a/app/serializers/deployment_entity.rb
+++ b/app/serializers/deployment_entity.rb
@@ -73,3 +73,5 @@ def project
     request.try(:project) || options[:project]
   end
 end
+
+DeploymentEntity.prepend_mod
diff --git a/app/serializers/environment_entity.rb b/app/serializers/environment_entity.rb
index 6105b52fbda373135211a005380dc93a473bb366..d484f60ed8fda6ad17845f17cb230a4a37052de8 100644
--- a/app/serializers/environment_entity.rb
+++ b/app/serializers/environment_entity.rb
@@ -20,6 +20,7 @@ class EnvironmentEntity < Grape::Entity
   expose :last_deployment, using: DeploymentEntity
   expose :stop_action_available?, as: :has_stop_action
   expose :rollout_status, if: -> (*) { can_read_deploy_board? }, using: RolloutStatusEntity
+  expose :tier
 
   expose :upcoming_deployment, if: -> (environment) { environment.upcoming_deployment } do |environment, ops|
     DeploymentEntity.represent(environment.upcoming_deployment,
diff --git a/ee/app/serializers/ee/deployment_entity.rb b/ee/app/serializers/ee/deployment_entity.rb
new file mode 100644
index 0000000000000000000000000000000000000000..54453d34d4eb0f2e0ecee388db09771c762ef977
--- /dev/null
+++ b/ee/app/serializers/ee/deployment_entity.rb
@@ -0,0 +1,11 @@
+# frozen_string_literal: true
+
+module EE
+  module DeploymentEntity
+    extend ActiveSupport::Concern
+
+    prepended do
+      expose :pending_approval_count
+    end
+  end
+end
diff --git a/ee/app/serializers/ee/environment_entity.rb b/ee/app/serializers/ee/environment_entity.rb
index c3f3085c17c8b56d2172e06c79bfc085ede64a95..f33fd5d7dc2aab4cb41edfc16941f671150a45c4 100644
--- a/ee/app/serializers/ee/environment_entity.rb
+++ b/ee/app/serializers/ee/environment_entity.rb
@@ -7,6 +7,7 @@ module EnvironmentEntity
 
     prepended do
       expose :has_opened_alert?, if: -> (*) { can_read_alert_management_alert? }, expose_nil: false, as: :has_opened_alert
+      expose :required_approval_count
     end
 
     private
diff --git a/ee/spec/fixtures/api/schemas/deployment.json b/ee/spec/fixtures/api/schemas/deployment.json
new file mode 100644
index 0000000000000000000000000000000000000000..3568c2b4c260a8dbf2a63e057728a152a173ad84
--- /dev/null
+++ b/ee/spec/fixtures/api/schemas/deployment.json
@@ -0,0 +1,15 @@
+{
+  "type": "object",
+  "allOf": [
+    {
+      "$ref": "../../../../../spec/fixtures/api/schemas/deployment.json"
+    },
+    {
+      "properties": {
+        "pending_approval_count": {
+          "type": "integer"
+        }
+      }
+    }
+  ]
+}
diff --git a/ee/spec/fixtures/api/schemas/environment.json b/ee/spec/fixtures/api/schemas/environment.json
index 7b9e106f46b1ecc5c3a7bd4b4cd967255ca14ea3..3c26e6c5c83c8cc2b2a34f934bec66894c194021 100644
--- a/ee/spec/fixtures/api/schemas/environment.json
+++ b/ee/spec/fixtures/api/schemas/environment.json
@@ -80,6 +80,8 @@
     },
     "delete_path": {
       "type": "string"
-    }
+    },
+    "tier": { "type": "string" },
+    "required_approval_count": { "type": "integer" }
   }
 }
diff --git a/ee/spec/serializers/ee/deployment_entity_spec.rb b/ee/spec/serializers/ee/deployment_entity_spec.rb
new file mode 100644
index 0000000000000000000000000000000000000000..a4026210390710d22cd03cb1847998577c72ccc0
--- /dev/null
+++ b/ee/spec/serializers/ee/deployment_entity_spec.rb
@@ -0,0 +1,24 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe DeploymentEntity do
+  let_it_be(:project) { create(:project, :repository) }
+  let_it_be(:environment) { create(:environment, project: project) }
+  let_it_be(:deployment) { create(:deployment, :blocked, project: project, environment: environment) }
+  let_it_be(:request) { EntityRequest.new(project: project, current_user: create(:user)) }
+
+  subject { described_class.new(deployment, request: request).as_json }
+
+  before do
+    stub_licensed_features(protected_environments: true)
+    create(:protected_environment, name: environment.name, project: project, required_approval_count: 3)
+    create(:deployment_approval, deployment: deployment)
+  end
+
+  describe '#pending_approval_count' do
+    it 'exposes pending_approval_count' do
+      expect(subject[:pending_approval_count]).to eq(2)
+    end
+  end
+end
diff --git a/ee/spec/serializers/environment_entity_spec.rb b/ee/spec/serializers/environment_entity_spec.rb
index fef7a3579cbd48a26ba8ca08a35b2075c0b6ee85..b85ad47eae0bbcdfcc02ba2d9f3e309ed102ca74 100644
--- a/ee/spec/serializers/environment_entity_spec.rb
+++ b/ee/spec/serializers/environment_entity_spec.rb
@@ -4,7 +4,7 @@
 
 RSpec.describe EnvironmentEntity do
   let(:user) { create(:user) }
-  let(:environment) { create(:environment) }
+  let(:environment) { create(:environment, project: project) }
   let(:project) { create(:project) }
 
   let(:entity) do
@@ -76,5 +76,16 @@
         it_behaves_like 'protected environments access', developer_access: false
       end
     end
+
+    context 'required_approval_count' do
+      before do
+        stub_licensed_features(protected_environments: true)
+        create(:protected_environment, name: environment.name, project: project, required_approval_count: 2)
+      end
+
+      it 'exposes required_approval_count' do
+        expect(subject[:required_approval_count]).to eq(2)
+      end
+    end
   end
 end
diff --git a/spec/fixtures/api/schemas/deployment.json b/spec/fixtures/api/schemas/deployment.json
index fa34a61c7d3d146d8effd06b848a05455ea483a3..7d96147314cacab1de97a0f97609aba6102e0815 100644
--- a/spec/fixtures/api/schemas/deployment.json
+++ b/spec/fixtures/api/schemas/deployment.json
@@ -64,6 +64,5 @@
       "items": { "$ref": "job/job.json" }
     },
     "status": { "type": "string" }
-  },
-  "additionalProperties": false
+  }
 }
diff --git a/spec/fixtures/api/schemas/environment.json b/spec/fixtures/api/schemas/environment.json
index 4f54a77e6b2a0ee84f65b700de7411bfa55027e6..87b6e5da370116afcc590fe249e8e519c62d9e3c 100644
--- a/spec/fixtures/api/schemas/environment.json
+++ b/spec/fixtures/api/schemas/environment.json
@@ -35,6 +35,8 @@
     "auto_stop_at": { "type": "string", "format": "date-time" },
     "can_stop": { "type": "boolean" },
     "has_opened_alert": { "type": "boolean" },
+    "tier": { "type": "string" },
+    "required_approval_count": { "type": "integer" },
     "cluster_type": { "type": "types/nullable_string.json" },
     "terminal_path": { "type": "types/nullable_string.json" },
     "rollout_status": {
diff --git a/spec/serializers/environment_entity_spec.rb b/spec/serializers/environment_entity_spec.rb
index a6101f825e9ae76592cc3af3a6cb77da378b1fd3..a59107ad3095ff5122d10ae50179a74c2aef3dc7 100644
--- a/spec/serializers/environment_entity_spec.rb
+++ b/spec/serializers/environment_entity_spec.rb
@@ -31,7 +31,7 @@
   end
 
   it 'exposes core elements of environment' do
-    expect(subject).to include(:id, :global_id, :name, :state, :environment_path)
+    expect(subject).to include(:id, :global_id, :name, :state, :environment_path, :tier)
   end
 
   it 'exposes folder path' do