Once you have configured Magento XML sitemap for products, categories, CMS pages, blog sitemap will be generated automatically and will be available by the same path as your default XML sitemap but with "blog_" prefix.
Default XML Sitemap URL: https://domain.com/sitemap.xml
Blog XML Sitemap URL: https://domain.com/blog_sitemap.xml
Default XML Sitemap URL: https://domain.com/pub/en_sitemap.xml
Blog XML Sitemap URL: https://domain.com/pub/blog_en_sitemap.xml
Note that you will not see and additional sitemap item in the sitemap grid in the admin panel, the blog sitemap XML will be generated automatically in the background together with the regular sitemap.
Once a blog sitemap is generated we strongly recommend adding its link to the robots.txt. You can see how we have done this at Magefan (https://magefan.com/robots.txt).
If you use Blog Plus or Blog Extra editions of the Blog extension you are able to change the priority and frequency of the blog items in the XML sitemap. In order to do this please go to Stores > Configuration > Blog and find the XML Sitemap Section. Here you can manage the frequency and priority of the Blog Index Page, Blog Categories and Blog Posts.
Blog XML Sitemap Troubleshooting
1. Why blog_sitemap.xml is missing in my Magento 2?
- Please make sure that you use the latest version of the blog extension. Check the changelog of the extension to see if there where any sitemap bug fixes or improvements.