diff --git a/content/customising/server/document-lifecycle/document-creation.md b/content/customising/server/document-lifecycle/document-creation.md
index c92b77115d..ca0d42da38 100644
--- a/content/customising/server/document-lifecycle/document-creation.md
+++ b/content/customising/server/document-lifecycle/document-creation.md
@@ -23,6 +23,6 @@ You don't need to fully understand everything going on right now, but as you lea
 
 1. For every `ContentType` you can define [`defaultContent`]({{< ref "/reference/project-config/content-types#default-content" >}}) and [`defaultMetadata`]({{< ref "/reference/project-config/content-types#default-metadata" >}}) which will be merged with passed content/metadata (passed data are preferred).
 2. content (import) and metadata (import + editor) will be validated in a next step
-3. metadata plugin hook [`onUpdate`]({{< ref "/customising/server/metadata-plugins#write-a-custom-plugin" >}}) will be called
+3. metadata plugin hook `onUpdate` will be called ({{< deprecated-in "release-2026-03" >}})
 4. Save the document on the database
 5. Call the server event [`document.create`]({{< ref "/customising/advanced/server-events#available-events" >}})
diff --git a/content/customising/server/document-lifecycle/document-publication.md b/content/customising/server/document-lifecycle/document-publication.md
index 5d12b95655..f4317af32f 100644
--- a/content/customising/server/document-lifecycle/document-publication.md
+++ b/content/customising/server/document-lifecycle/document-publication.md
@@ -14,7 +14,7 @@ Below is a diagram for the document publication lifecycle. You don't need to ful
 {{< img src="assets/document-publication-lifecycle.png" alt="Document Publication Lifecycle" >}}
 
 1. Start "Prepare Publish" phase where you still can modify the document, validate data and throw errors back to the callee
-2. Call metadata plugin hook [`onPreparePublish`]({{< ref "/customising/server/metadata-plugins#write-a-custom-plugin" >}}) (modify metadata property, validation)
+2. Call metadata plugin hook `onPreparePublish` (modify metadata property, validation) ({{< deprecated-in "release-2026-03" >}})
 3. Call server hook [`preparePublishHook`]({{< ref "/customising/server/server-hooks#publication-hooks" >}}) (modify document, validation).
 4. Start "Publication" phase
 5. Save the publication on the database
diff --git a/content/guides/editor/push-notifications/index.md b/content/guides/editor/push-notifications/index.md
index 3506209761..20ac7b6022 100644
--- a/content/guides/editor/push-notifications/index.md
+++ b/content/guides/editor/push-notifications/index.md
@@ -4,10 +4,9 @@ description: Setup push notifications with a custom dashboard item
 weight: 15
 ---
 
-{{< warning >}}
-Please don't use this functionality anymore. it will be removed eventually after a formal deprecation period that has not started yet.
-Use the [`li-push-messages` metadata plugin]({{< ref "/reference/document/metadata/plugins/li-push-messages" >}}) instead.
-{{< /warning >}}
+{{< deprecated-in "release-2026-03" block >}}
+
+`li-push-notifications` is deprecated and will be removed in `release-2026-09`. Please use the [`li-push-messages` metadata plugin]({{< ref "/reference/document/metadata/plugins/li-push-messages" >}}) instead.
 
 This guide explains 2 things:
 
diff --git a/content/guides/setup/editor-customization.md b/content/guides/setup/editor-customization.md
index e3fd57b59d..52e2bc013e 100644
--- a/content/guides/setup/editor-customization.md
+++ b/content/guides/setup/editor-customization.md
@@ -10,14 +10,9 @@ weight: 2
 
 Possible Livingdocs Editor UI customizations:
 
-- custom Angular factories or services (for use in other customizations)
-- custom Angular components for metadata fields
-- .. or [custom model classes]({{< ref "/guides/documents/metadata" >}}) for existing metadata fields
-- custom Angular components for doc-include sidebar user interfaces
+- [custom model classes]({{< ref "/guides/documents/metadata" >}}) for existing metadata fields
 - custom [Display Filter]({{< ref "/customising/advanced/editor-configuration/display-filter.md" >}})
 - custom Dashboard item (a single item in the articles dashboard)
-- custom Embed components (the core contains Iframes and Tweets)
-- custom Iframely metadata extractors
 - locale customizations
 
 ## Editor Configuration
@@ -29,43 +24,12 @@ In addition to this some behaviour can be customised using the JSON configuratio
 The editor (like the server) usually has an `app/editor.js` file where code customizations are registered and that looks something like this:
 
 ```js
-// entry point when using the webpack build of the editor
 const liEditor = require('@livingdocs/editor')()
-const editingApiModule = window.angular.module('li-editing-api')
-// the Angular editorModule -> can be used to register services and factories
-const editorModule = window.angular.module('livingdocs-editor')
-
-// example of loading a custom angular module: ui-validate
-// require('angular-ui-validate')
-// editorModule.requires.push('ui.validate')
-
-// Just require a custom Angular factory using the editorApiModule
-require('./custom/scripts/factories/categories')(editingApiModule)
 
 // Register a custom filter for the dashboard
 const layoutsFilter = require('./custom/filters/layouts_filter')
 liEditor.searchFilters.registerListV2('layouts', layoutsFilter)
 
-// Register a custom doc-include sidebar interface (Angular component)
-liEditor.includes.register('brightcove', {
-  template: require('../plugins/includes/ld-brightcove-include/brightcove_include_template.html'),
-  controller: require('../plugins/includes/ld-brightcove-include/brightcove_include_controller'),
-  bindings: {
-    directive: '=',
-    componentView: '=',
-    component: '='
-  }
-})
-
-// Example of custom embeds
-// embeds = require('@livingdocs/editor/app/scripts/modules/embeds/embeds')
-// Pinterest = require('./custom/scripts/modules/embeds/pinterest/pinterest')
-// Facebook = require('./custom/scripts/modules/embeds/facebook/facebook')
-// embeds.registerCustomEmbeds [
-//   Facebook,
-//   Pinterest
-// ]
-
 // Example of changing the date locale
 // moment = require('moment')
 // momentDe = require('moment/locale/de')
diff --git a/content/reference/document/metadata/plugins/li-push-notifications.md b/content/reference/document/metadata/plugins/li-push-notifications.md
index e8240415a6..93e7ef65b8 100644
--- a/content/reference/document/metadata/plugins/li-push-notifications.md
+++ b/content/reference/document/metadata/plugins/li-push-notifications.md
@@ -17,9 +17,8 @@ support:
   systemMetadata: true
   planningSystem: false
 description: |
-  {{< warning >}}
-  Support for `li-push-notifications` will soon be removed. Please use [`li-push-messages`]({{< ref "/reference/document/metadata/plugins/li-push-messages" >}}) instead.
-  {{< /warning >}}
+  {{< deprecated-in "release-2026-03" block >}}
+  `li-push-notifications` is deprecated and will be removed in `release-2026-09`. Please use [`li-push-messages`]({{< ref "/reference/document/metadata/plugins/li-push-messages" >}}) instead.
 defaultUI: Editor toolbar button which opens a dialog.
 storageFormat: |
   {