Merge pull request #3723 from DataDog/tonycthsu/post-install-message

Add post_install_message in gemspec

CHANGELOG.md

@@ -2826,7 +2826,7 @@ Release notes: https://github.com/DataDog/dd-trace-rb/releases/tag/v0.3.1
 Git diff: https://github.com/DataDog/dd-trace-rb/compare/v0.3.0...v0.3.1
 
 
-[Unreleased]: https://github.com/DataDog/dd-trace-rb/compare/v1.23.2...master
+[Unreleased]: https://github.com/DataDog/dd-trace-rb/compare/v1.23.2...1.x-stable
 [1.23.2]: https://github.com/DataDog/dd-trace-rb/compare/v1.23.1...v1.23.2
 [1.23.1]: https://github.com/DataDog/dd-trace-rb/compare/v1.23.0...v1.23.1
 [1.23.0]: https://github.com/DataDog/dd-trace-rb/compare/v1.22.0...v1.23.0

ddtrace.gemspec

@@ -75,4 +75,14 @@ Gem::Specification.new do |spec|
   spec.add_dependency 'datadog-ci', '~> 0.8.1'
 
   spec.extensions = ['ext/datadog_profiling_native_extension/extconf.rb', 'ext/datadog_profiling_loader/extconf.rb']
+
+  spec.post_install_message = <<-MSG
+    Thank you for installing ddtrace. We have released our next major version!
+
+    As of version 2, `ddtrace` gem has been renamed to `datadog`.
+    The 1.x series will now only receive maintenance updates for security and critical bug fixes.
+
+    To upgrade, please replace gem `ddtrace` with gem `datadog`.
+    For detailed instructions on migration, see: https://dtdg.co/ruby-v2-upgrade
+  MSG
 end

spec/ddtrace/release_gem_spec.rb

@@ -131,5 +131,11 @@
         end
       end
     end
+
+    describe '#post_install_message' do
+      it do
+        expect(gemspec.post_install_message).to_not be_nil
+      end
+    end
   end
 end