Every so often, Google Webmaster Tools adds a new wrinkle that makes life measurably easier for SEO leadership at large organizations. Index Status is one of those wrinkles.
This nifty little feature - which was released this past summer but has gotten relatively little fanfare considering the profound insights and leverage it can provide – does two things that I find crucial:
It helps quickly diagnose very serious issues with duplicate and/or non-canonical URLs that could be wasting your daily allotment of crawl budget while simultaneously confusing the hell out of search engine crawlers.
It provides a very intuitive data visualization that can be used to tell a very compelling story to cross-functional stakeholders, which in turn, can lead to the site and server-level implementation to overcome duplicate and canonical issues.