Self Canonicalized Pages
What does this report contain?
Pages where the canonical URL (specified in the canonical tag in either the HTML or HTTP header) matches the URL.
How can this report be used?
Pages which canonicalize to themselves are correct in many instances and can help prevent duplication from URL parameters. In some cases, however, self canonicalisation can be the incorrect action and can cause duplication issues: for instance, some URLs which should be canonicalized (i.e. a URL with a tracking parameter), so a self canonical in this case would cause duplication issues.