Docs: Delete migrating_to2.md (#26593)

* Delete migrating_to2.md

* Update upgrading.md

docs/sources/installation/migrating_to2.md

-+++
-title = "Migrating from older versions"
-description = "Upgrading and Migrating Grafana from older versions"
-keywords = ["grafana", "configuration", "documentation", "migration"]
-type = "docs"
-+++
-
-# Migrating from older versions
-
-Normally new versions of Grafana are backward compatible. Any changes to database or dashboard schema will
-be automatically migrated when Grafana-server start up without any user action required.
-
-# Migrating from v1.x to v2.x
-
-Grafana 2.0 represents a major update to Grafana. It brings new
-capabilities, many of which are enabled by its new back-end server and
-integrated database.
-
-The new back-end lays a solid foundation that we hope to build on over
-the coming months. For the 2.0 release, it enables authentication as
-well as server-side sharing and rendering.
-
-We've attempted to provide a smooth migration path for v1.9 users to
-migrate to Grafana 2.0.
-
-## Adding Data sources
-
-The `config.js` file has been deprecated. Data sources are now managed via
-the UI or HTTP API. Manage your organizations data sources by clicking on the `Data Sources` menu on the
-side menu (which can be toggled via the Grafana icon in the upper left
-of your browser).
-
-From here, you can add any Graphite, InfluxDB, elasticsearch, and
-OpenTSDB data sources that you were using with Grafana 1.x. Grafana 2.0
-can be configured to communicate with your data source using a back-end
-mode which can eliminate many CORS-related issues, as well as provide
-more secure authentication to your data sources.
-
-> *Note* When you add your data sources please name them exactly as you
-> named them in `config.js` in Grafana 1.x. That name is referenced by
-> panels, annotation and template queries. That way when you import
-> your old dashboard they will work without any changes.
-
-## Importing your existing dashboards
-
-Grafana 2.0 now has integrated dashboard storage engine that can be
-configured to use an internal sqlite3 database, MySQL, or Postgres. This
-eliminates the need to use Elasticsearch for dashboard storage for
-Graphite users. Grafana 2.0 does not support storing dashboards in
-InfluxDB.
-
-You can seamlessly import your existing dashboards.
-
-### Importing dashboards from Elasticsearch
-
-Start by going to the `Data Sources` view (via the side menu), and make
-sure your Elasticsearch data source is added. Specify the Elasticsearch
-index name where your existing Grafana v1.x dashboards are stored
-(the default is `grafana-dash`).
-
-![](/img/docs/v2/datasource_edit_elastic.jpg)
-
-### Importing dashboards from InfluxDB
-
-Start by going to the `Data Sources` view (via the side menu), and make
-sure your InfluxDB data source is added. Specify the database name where
-your Grafana v1.x dashboards are stored, the default is `grafana`.
-
-### Go to Import dashboards view
-
-Go to the `Dashboards` view and click on the dashboards search drop
-down. Click the `Import` button at the bottom of the search drop down.
-
-![](/img/docs/v2/dashboard_import.jpg)
-
-### Import view
-
-In the Import view you find the section `Migrate dashboards`. Pick the
-data source you added (from Elasticsearch or InfluxDB), and click the
-`Import` button.
-
-![](/img/docs/v2/migrate_dashboards.jpg)
-
-Your dashboards should be automatically imported into the Grafana 2.0
-back-end.
-
-Dashboards will no longer be stored in your previous Elasticsearch or
-InfluxDB databases.
-
-### Invite your team
-
-Explain users and orgs.
-
-### Enjoy the new features

docs/sources/installation/upgrading.md

@@ -121,14 +121,6 @@ You can update all plugins using
 grafana-cli plugins update-all
 ```
 
-## Upgrading from 1.x
-
-[Migrating from 1.x to 2.x]({{< relref "migrating_to2.md" >}})
-
-## Upgrading from 2.x
-
-We are not aware of any issues upgrading directly from 2.x to 4.x but to be on the safe side go via 3.x => 4.x.
-
 ## Upgrading to v5.0
 
 The dashboard grid layout engine has changed. All dashboards will be automatically upgraded to new positioning system when you load them in v5. Dashboards saved in v5 will not work in older versions of Grafana. Some external panel plugins might need to be updated to work properly.