diff --git a/.changeset/brown-boxes-arrive.md b/.changeset/brown-boxes-arrive.md
new file mode 100644
index 0000000000..edefc0dcaf
--- /dev/null
+++ b/.changeset/brown-boxes-arrive.md
@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-plugin-api': minor
+---
+
+**BREAKING**: Removed support for "v1" extensions. This means that it is no longer possible to declare inputs and outputs as objects when using `createExtension`. In addition, all extension creators except for `createComponentExtension` have been removed, use the equivalent blueprint instead. See the [1.30 migration documentation](https://backstage.io/docs/frontend-system/architecture/migrations/#130) for more information on this change.
diff --git a/.changeset/empty-coats-sparkle.md b/.changeset/empty-coats-sparkle.md
new file mode 100644
index 0000000000..7e3b791c6b
--- /dev/null
+++ b/.changeset/empty-coats-sparkle.md
@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-test-utils': minor
+---
+
+Removed support for testing "v1" extensions, where outputs are defined as an object rather than an array.
diff --git a/.changeset/serious-cheetahs-help.md b/.changeset/serious-cheetahs-help.md
new file mode 100644
index 0000000000..fa9debcf8c
--- /dev/null
+++ b/.changeset/serious-cheetahs-help.md
@@ -0,0 +1,7 @@
+---
+'@backstage/plugin-catalog-react': patch
+'@backstage/plugin-search-react': patch
+'@backstage/plugin-catalog': patch
+---
+
+The `/alpha` export no longer export extension creators for the new frontend system, existing usage should be switched to use the equivalent extension blueprint instead.
diff --git a/.changeset/sharp-mayflies-beg.md b/.changeset/sharp-mayflies-beg.md
new file mode 100644
index 0000000000..c78335c187
--- /dev/null
+++ b/.changeset/sharp-mayflies-beg.md
@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-app-api': patch
+---
+
+Internal refactor following removal of v1 extension support. The app implementation itself still supports v1 extensions at runtime.