Add a post about Wasmtime's new LTS releases (#127)

Summarize the outcome of
bytecodealliance/rfcs#42 and link to the
documentation we now have on LTS releases.

Author: alexcrichton

_posts/2025-04-22-wasmtime-lts.md

@@ -0,0 +1,56 @@
+---
+title: "Wasmtime LTS Releases"
+author: "Alex Crichton"
+date: "2025-04-22"
+github_name: "alexcrichton"
+excerpt_separator: <!--end_excerpt-->
+---
+
+[Wasmtime](https://wasmtime.dev/) is a lightweight WebAssembly runtime built for
+speed, security, and standards-compliance. Wasmtime now supports
+long-term-support (LTS) releases that are maintained with security fixes for 2
+years after their initial release.
+
+<!--end_excerpt-->
+
+The Wasmtime project releases a new version once a month with new features, bug
+fixes, and performance improvements. Previously though these releases were only
+supported for 2 months meaning that embedders needed to follow the Wasmtime
+project pretty closely to receive security updates. This rate of change can be
+too fast for users so Wasmtime now supports [LTS
+releases](https://github.com/bytecodealliance/rfcs/blob/main/accepted/wasmtime-lts.md).
+
+Every 12th version of Wasmtime will now be considered an LTS release and will
+receive security fixes for 2 years, or 24 months. This means that users can now
+update Wasmtime once-a-year instead of once-a-month and be guaranteed that they
+will always receive security updates. Wasmtime's 24.0.0 release has been
+retroactively classified as a LTS release and will be supported until August 20,
+2026. Wasmtime's upcoming 36.0.0 release on August 20, 2025 will be supported
+until August 20, 2027, meaning that users will have one year starting in August
+to upgrade from 24.0.0 to 36.0.0.
+
+You can view a table of Wasmtime's releases [in the documentation
+book](https://docs.wasmtime.dev/stability-release.html) which has information on
+all currently supported releases, upcoming releases, and information about
+previously supported releases. The high-level summary of Wasmtime's LTS release
+channel is:
+
+* LTS releases receive patch updates for 2 years after their initial release.
+* Patch releases are guaranteed to preserve API compatibility.
+* Patch releases strive to maintain tooling compatibility (e.g. the Rust version
+  required to compile Wasmtime) from the time of release. Depending on EOL dates
+  from components such as GitHub Actions images, however, this may need minor
+  updates.
+* Patch releases are guaranteed to be issued for any security bug found in
+  historical releases of Wasmtime.
+* Patch releases may be issued to fix non-security released bugs as they are
+  discovered. The Wasmtime project will rely on contributions to provide
+  backports for these fixes.
+* Patch releases will not be issued for new features to Wasmtime, even if a
+  contribution is made to backport a new feature.
+
+If you're a current user of Wasmtime and would like to use an LTS release then
+it's recommended to either downgrade to the 24.0.0 version or wait for this
+August to upgrade to the 36.0.0 version. Wasmtime 34.0.0, to be released June
+20, 2025, will be supported up until the release of Wasmtime 36.0.0 on August
+20, 2025.