- [#3956](https://github.com/withastro/astro/pull/3956) [`57e529e4c`](https://github.com/withastro/astro/commit/57e529e4c13f3e7829311ac6f92682eb6333fd96) Thanks [@esafev](https://github.com/esafev)! - Throw the error when 'site' option is missing
- [#3301](https://github.com/withastro/astro/pull/3301) [`0efaf110`](https://github.com/withastro/astro/commit/0efaf110fceba149cd41cbaa0f37311e6887cdec) Thanks [@bholmesdev](https://github.com/bholmesdev)! - Change the optional "canonicalUrl" argument to a required "site" argument. This fixes problems with import.meta.env.SITE. If you want to use your project's "site" field for your RSS feeds, set site: import.meta.env.SITE in the rss function options
- [`1032e450`](https://github.com/withastro/astro/commit/1032e450cc224e603e8e69ef1422de6dbf184dd2) Thanks [@FredKSchott](https://github.com/FredKSchott)! - Introduce new @astrojs/rss package for RSS feed generation! This also adds a new global env variable for your project's configured "site": import.meta.env.SITE. This is consumed by the RSS feed helper to generate the correct canonical URL.