Canonicalised to another URL
What it means
These pages name a different URL as canonical, so they are asking not to be indexed themselves. That is often correct, but it is worth checking that each one is deliberate, because a canonical pointing at the wrong page removes it from search results entirely.
How to fix it
Confirm the target is the page you want indexed, that it returns 200, and that its content really is equivalent. A canonical across genuinely different pages is ignored at best and loses you the page at worst. Pagination and filtered listings should usually point the canonical at themselves instead.
Finding it in CrawlStat
After a crawl, open Issues and pick Canonicalised to another URL. Click Show all in Pages to filter the Pages table to the affected pages, or Export affected to hand the list to whoever owns the fix. Audit ID: canonicalised.