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+<!--
+Thank you for creating a pull request!
+-->
+
+## Contributor License Agreement
+
+This repository (``optuna-dashboard``) and [Goptuna](https://github.com/c-bata/goptuna) share common code.
+This pull request may therefore be ported to Goptuna.
+Make sure that you understand the consequences concerning licenses and check the box below if you accept the term before creating this pull request.
+
+* [ ] I agree this patch may be ported to [Goptuna](https://github.com/c-bata/goptuna) by other Goptuna contributors.
+
+## Reference Issues/PRs
+<!--
+Example: Fixes #1234. Close #1234. See also #1234. Follow-up #1234.
+Please use keywords (e.g., Fixes) to automatically close referenced issues.
+-->
+
+## What does this implement/fix? Explain your changes.
+
+<!-- Describe the changes in this PR. A picture or video tells a thousand words. -->