reindexaTwo pages missing from the index can be in very different situations. Google may know one address without having crawled it according to the available report. Another page may already have been crawled without being indexed. Your first job is to establish which situation you are investigating.
Why the distinction changes your next step
An individual page inspection helps you investigate what Google knows about a URL. For a discovered page, start with how Google reaches it and whether access works. For a crawled page, expand the investigation to content, canonical signals and the page's role within the site.
This does not mean every discovered URL has a server problem or every crawled URL has a quality problem. It is a way to order your checks, not a rule that replaces evidence.
When the page is discovered
Check that the published address returns the expected response, has internal links and does not depend entirely on visitors using the site's search box. Also check whether a recent release created thousands of filter combinations or new routes.
For a large site, reviewing crawl capacity and demand may be useful. Google's crawl budget guidance is particularly relevant to extensive sites or update problems. It does not make every delayed page on a small blog a crawl-budget issue.
When the page has been crawled
First check whether a later inspection still reports the same state. Then compare the content with related pages, review canonical signals and assess the value of this particular URL. If several affected pages share a template, investigate that template before editing dozens of URLs separately.
A product page with original information and a location page created by replacing a city name may require different work. Record the differences you can demonstrate rather than assuming a shared reason for Google's decisions.
Preserve intermediate changes
Imagine a URL moving from discovered to crawled but not indexed, and later to indexed. The first transition changes what you know, even though the desired outcome has not yet occurred. A report that only labels pages “good” or “bad” would hide that intermediate observation.
Keep the sequence, query dates and starting state. If you group detailed reasons into broader categories, retain the original reason for later investigation.
Reindexa follows saved URLs originating from the crawled-but-unindexed report. Later inspections can return different reasons, grouped under other states. It does not discover every pending URL across the web. Its monitoring covers the saved set. For the discovery side of your investigation, also review internal links and sitemaps.