Present how to consolidate and migrate projects across Gerrit servers

Propose a talk on how to leverage Gerrit v3.7 for consolidating
and migrating projects across Gerrit servers with different ServerIds.

Change-Id: I4659b64092a652b0f75e9822abb7724e45b26093
diff --git a/schedule.md b/schedule.md
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--- a/schedule.md
+++ b/schedule.md
@@ -66,7 +66,7 @@
 | Time  | Session
 |-------|-------------------------------------------
 |  9:00 | Breakfast & Networking
-|  9:30 | __Talk available__
+|  9:30 | [Import Gerrit projects across servers](sessions/import-gerrit-projects-across-servers.md)
 | 10:15 | __Talk available__
 | 11:00 | __Talk available__
 | 12:00 | Lunch& Networking
diff --git a/sessions/import-gerrit-projects-across-servers.md b/sessions/import-gerrit-projects-across-servers.md
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+# Import Gerrit projects across servers
+
+NoteDb was introduced 5 years ago with the promise of
+simpifying the portability of reviews and repositories across
+Gerrit servers and, in the future, different code-review systems.
+The promise was that a JSON-based representation of the review
+meta-data would have allowed to rebuild a full state and history
+anywhere, without having to rely on a centralised DBMS.
+
+With that promise in mind, the development of the [Gerrit importer plugin](https://gerrit.googlesource.com/plugins/importer/)
+developed by [SAP](https://sap.com) stopped at version v2.15 and
+no more upgrades where planned.
+
+From Gerrit v2.16 up to now, the Gerrit admins were unable to
+follow any phased-migration as they could have done with the
+use of the importer plugin, forcing companies to go through a
+painful release-by-release upgrade process or multi-year bing-bang
+migration projects.
+
+Luca gives an overview of how the migration and consolidation
+is now possible with Gerrit v3.7, describing the challenges and
+limitations of what can be done.
+
+*[Luca Milanesio, GerritForge](../speakers.md#lmilanesio)*