Docs: Add What's New 7.3 (#28268)

* add base

* Update docs/sources/whatsnew/whats-new-in-v7-3.md

* Update What's new in 7.3 with CM OOTB dashboards

* Docs: enterprise whats new placeholders

* Add short url info

* Update shorten url after pull

* Update docs/sources/whatsnew/whats-new-in-v7-3.md

Co-authored-by: Marcus Efraimsson <marcus.efraimsson@gmail.com>
Co-authored-by: Sofia Papagiannaki <sofia@grafana.com>
Co-authored-by: Leonard Gram <leo@xlson.com>
Co-authored-by: Ivana <ivana.huckova@gmail.com>

docs/sources/datasources/cloudmonitoring.md

@@ -342,11 +342,11 @@ The link navigates the user first to the Google Account Chooser and after succes
 
 The updated Cloud Monitoring data source ships with pre-configured dashboards for five of the most popular GCP services:
 
-1. BigQuery Query Monitoring
-1. Cloud SQL Monitoring
-1. GCE VM Instance Monitoring
-1. GKE Cluster Monitoring
-1. HTTP_S Load Balancer Monitoring
+1. BigQuery
+1. Cloud Load Balancing
+1. Cloud SQL
+1. Google Compute Engine `GCE`
+1. Google Kubernetes Engine `GKE`
 
 To import the pre-configured dashboards, go to the configuration page of a Cloud monitoring data source and click on the `Dashboards` tab. Click `Import` for the dashboard you would like to use.
 The datasource of the newly created dashboard panels will be the one selected above.

docs/sources/menu.yaml

@@ -339,6 +339,8 @@
 - name: What's new in Grafana
   link: /whatsnew/
   children:
+    - name: Version 7.3
+      link: /whatsnew/whats-new-in-v7-3/
     - name: Version 7.2
       link: /whatsnew/whats-new-in-v7-2/
     - name: Version 7.1

docs/sources/whatsnew/whats-new-in-v7-3.md

++++
+title = "What's New in Grafana v7.3"
+description = "Feature and improvement highlights for Grafana v7.3"
+keywords = ["grafana", "new", "documentation", "7.3", "release notes"]
+type = "docs"
+aliases = ["/docs/grafana/latest/guides/whats-new-in-v7-3/"]
+[menu.docs]
+name = "Version 7.3"
+identifier = "v7.3"
+parent = "whatsnew"
+weight = -17
++++
+
+# What's new in Grafana v7.3
+
+This topic includes the release notes for the Grafana v7.3. For all details, read the full [CHANGELOG.md](https://github.com/grafana/grafana/blob/master/CHANGELOG.md).
+
+## Highlights
+
+Grafana 7.3 comes with a number of features and enhancements:
+
+- [**Google Cloud Monitoring:** Out of the box dashboards]({{< relref "#cloud-monitoring-out-of-the-box-dashboards" >}})
+- [**Shorten URL for dashboards and Explore**]({{< relref "#shorten-url-for-dashboards-and-explore" >}})
+
+#### Cloud monitoring out-of-the-box dashboards
+
+The updated Cloud monitoring data source is shipped with pre-configured dashboards for five of the most popular GCP services:
+
+- BigQuery
+- Cloud Load Balancing
+- Cloud SQL
+- Google Compute Engine `GCE`
+- Google Kubernetes Engine `GKE`
+
+To import the pre-configured dashboards, go to the configuration page of your Google Cloud Monitoring data source and click on the `Dashboards` tab. Click `Import` for the dashboard you would like to use. To customize the dashboard, we recommend to save the dashboard under a different name, because otherwise the dashboard will be overwritten when a new version of the dashboard is released.
+
+For more details, see the [Google Cloud Monitoring docs]({{<relref "../datasources/cloudmonitoring/#out-of-the-box-dashboards">}})
+
+## Shorten URL for dashboards and Explore
+
+This is an amazing new feature that was created in cooperation with one of our community members. The new **share shortened link** capability allows you to create smaller and simpler URLs of the format `/goto/:uid` instead of using longer URLs that can contain complex query parameters. In Explore, you can create a shortened link by clicking on the share button in Explore toolbar. In the dashboards, a shortened url option is available through the share panel or dashboard button.
+
+## Grafana Enterprise features
+
+These features are included in the Grafana Enterprise edition software.
+
+### Auditing
+
+### Datasource Usage Insights
+
+### SAML Improvements
+
+## Upgrading
+
+See [upgrade notes]({{< relref "../installation/upgrading.md" >}}).
+
+## Changelog
+
+Check out [CHANGELOG.md](https://github.com/grafana/grafana/blob/master/CHANGELOG.md) for a complete list of new features, changes, and bug fixes.