Adjust Danger logic for stable branches

Danger only considers the current stable version
when checking if it is within the maintenance policy.

spec/tooling/danger/stable_branch_spec.rb

@@ -59,6 +59,8 @@
     end
     context 'when not applicable' do
+      let(:current_stable_branch) { '15-1-stable-ee' }
+
       where(:stable_branch?, :security_mr?) do
         true  | true
         false | true
@@ -67,7 +69,7 @@
       with_them do
         before do
-          allow(fake_helper).to receive(:mr_target_branch).and_return(stable_branch? ? '15-1-stable-ee' : 'main')
+          allow(fake_helper).to receive(:mr_target_branch).and_return(stable_branch? ? current_stable_branch : 'main')
           allow(fake_helper).to receive(:security_mr?).and_return(security_mr?)
         end
@@ -239,7 +241,7 @@
       end
       context 'when not an applicable version' do
-        let(:target_branch) { '14-9-stable-ee' }
+        let(:target_branch) { '15-0-stable-ee' }
         it 'warns about the package-and-test pipeline and the version' do
           expect(stable_branch).to receive(:warn).with(described_class::WARN_PACKAGE_AND_TEST_MESSAGE)
@@ -297,18 +299,6 @@
         it_behaves_like 'without a failure'
       end
-
-      context 'when too many version API requests are made' do
-        let(:parsed_response) { [{ 'version' => '15.0.0' }] }
-
-        it 'adds a warning' do
-          expect(HTTParty).to receive(:get).and_return(version_response).at_least(10).times
-          expect(stable_branch).to receive(:warn).with(described_class::WARN_PACKAGE_AND_TEST_MESSAGE)
-          expect(stable_branch).to receive(:warn).with(described_class::FAILED_VERSION_REQUEST_MESSAGE)
-
-          subject
-        end
-      end
     end
   end

tooling/danger/stable_branch.rb

@@ -146,26 +146,20 @@ def has_only_documentation_changes?
       end
       def targeting_patchable_version?
-        raise VersionApiError if last_three_minor_versions.empty?
-        last_three_minor_versions.include?(targeted_version)
+        raise VersionApiError if current_stable_version.empty?
+        current_stable_version == targeted_version
       rescue VersionApiError
         warn FAILED_VERSION_REQUEST_MESSAGE
         true
       end
-      def last_three_minor_versions
-        return [] unless versions
+      def current_stable_version
+        return unless versions
         current_version = versions.first.match(VERSION_REGEX)
-        version_1 = previous_minor_version(current_version)
-        version_2 = previous_minor_version(version_1)
-        [
-          version_to_minor_string(current_version),
-          version_to_minor_string(version_1),
-          version_to_minor_string(version_2)
-        ]
+        version_to_minor_string(current_version)
       end
       def targeted_version
@@ -173,7 +167,7 @@ def targeted_version
       end
       def versions(page = 1)
-        version_api_endpoint = "https://version.gitlab.com/api/v1/versions?per_page=50&page=#{page}"
+        version_api_endpoint = "https://version.gitlab.com/api/v1/versions?per_page=20&page=#{page}"
         response = HTTParty.get(version_api_endpoint) # rubocop:disable Gitlab/HTTParty
         raise VersionApiError unless response.success?
@@ -183,33 +177,6 @@ def versions(page = 1)
         version_list.sort_by { |v| Gem::Version.new(v) }.reverse
       end
-      def previous_minor_version(version)
-        previous_minor = version[:minor].to_i - 1
-
-        return "#{version[:major]}.#{previous_minor}".match(VERSION_REGEX) if previous_minor >= 0
-
-        fetch_last_minor_version_for_major(version[:major].to_i - 1)
-      end
-
-      def fetch_last_minor_version_for_major(major)
-        page = 1
-        last_minor_version = nil
-
-        while last_minor_version.nil?
-          last_minor_version = versions(page).find do |version|
-            version.split('.').first.to_i == major
-          end
-
-          break if page > 10
-
-          page += 1
-        end
-
-        raise VersionApiError if last_minor_version.nil?
-
-        last_minor_version.match(VERSION_REGEX)
-      end
-
       def version_to_minor_string(version)
         "#{version[:major]}.#{version[:minor]}"
       end