Timelion deprecation doc

docs/user/visualize.asciidoc

@@ -132,6 +132,7 @@ include::{kib-repo-dir}/visualize/lens.asciidoc[]
 include::{kib-repo-dir}/visualize/most-frequent.asciidoc[]
 
 include::{kib-repo-dir}/visualize/tsvb.asciidoc[]
+
 include::{kib-repo-dir}/visualize/timelion.asciidoc[]
 
 include::{kib-repo-dir}/visualize/tilemap.asciidoc[]

docs/visualize/timelion.asciidoc

@@ -504,3 +504,52 @@ image::images/timelion-conditional04.png[]
 {nbsp}
 
 For additional information on Timelion conditional capabilities, go to https://www.elastic.co/blog/timeseries-if-then-else-with-timelion[I have but one .condition()].
+
+[float]
+[[timelion-deprecation]]
+=== Timelion App deprecation
+
+In *8.0* and later, the Timelion app - deprecated since 7.0 - is going to be removed. There are actions you need to complete to copy your existing Timelion worksheets to a dashboard.  
+
+NOTE: Only the Timelion app is deprecated, not Timelion as a visualization (on dashboards and in the visualize application) or Timelion in Canvas. 
+
+[role="screenshot"]
+image::images/timelion-app.png[]
+{nbsp}
+
+[float]
+[[timelion-app-to-vis]]
+==== Create a dashboard from a Timelion worksheet
+
+Timelion worksheets are deprecated, but they can easily be replaced by a dashboard. The process is the same as adding a new visualization to a dashboard but the Timelion charts should also be migrated to **Visualize**. 
+
+Open the menu, click **Dashboard**, then click **Create dashboard**.
+
+On the dashboard, click **Create New**, then select the Timelion visualization.
+
+[role="screenshot"]
+image::images/timelion-create-new-dashboard.png[]
+{nbsp}
+
+
+The oly thing you need is the Timelion expression for each graph.
+
+Open Timelion app on a new tab, select the chart you want to copy, and copy its expression.
+
+[role="screenshot"]
+image::images/timelion-copy-expression.png[]
+{nbsp}
+
+Return to the other tab and paste the copied expression to the *Timelion Expression* field and click **Update**.
+
+[role="screenshot"]
+image::images/timelion-vis-paste-expression.png[]
+{nbsp}
+
+Click to save the new visualization, give a name, and hit **Save and Return**.
+
+Your Timelion visualization will appear on the dashboard. Repeat for all your charts on each worksheet.
+
+[role="screenshot"]
+image::images/timelion-dashboard.png[]
+{nbsp}