We refactored our website last year. Some pages do not exist. We added aliases for old URLs in the metadata of new files.
For example:
------
title: Product Overview
summary: Learn about key components and features ...
category: reference
aliases: ['/docs/tools/overview/','/docs/tools/pr-overview/']
-------
After we refactored our website, we found our SEO ranking dropped.
Is Hugo alias a 301 redirect? Does it affect SEO?