Why are there duplicate Help Center article URLs showing up in our Google Analytics reports? Is Google marking these pages as duplicates?
Help Center URLs contain both an ID and a slug to ensure that this structure is not affected if the title of an article is changed at some point. For example, if you add a blank space at the end of an article's title, then remove it by editing the article, this would generate two URLs which would be picked up by the web crawlers and/or Google bots.
You can find out more about the Help Center's unique URL structure in this article: About search engine optimization (SEO) in Help Center.
Each article has a unique canonical URL that ensures that the correct link and page is displayed in the SERPs (Search Engine Page Results). The canonical link will be the only one that Google and/ or any other search engine will take into consideration.
Even if multiple URLs for the same page can be retrieved via a web crawler or in Google Analytics, only the canonical URLs will be the ones which would actually count and be indexed by Google.
For example an article can be accessed both via "https://mysubdomain.zendesk.com/hc/en-us/articles/123456" and/or "https://mysubdomain.zendesk.com/hc/en-us/articles/123456/article-name", as long as the canonical is set to "https://mysubdomain.zendesk.com/hc/en-us/articles/123456/article-name" then this is the only URL that is going to be picked up by Google as relevant for that specific page.
Duplicate content, as well as Google penalties are avoided as every Help Center page has a unique canonical URL that is set up automatically on our back end.