The HTML Improvements report can diagnose some common issues regarding metadata and indexable content, including:
- Duplicate meta descriptions
- Long meta descriptions
- Short meta descriptions
- Missing title tags
- Duplicate title tags
- Long title tags
- Short title tags
- Non-informative title tags
- Non-indexable content
Access the report by navigating to Search Appearance and clicking on HTML Improvements in Search Console.
Note: You can click on the screenshot below to view at a larger size.