Add details of the Gerrit multi-site talk

Change-Id: Ib0b123d654b554199a8abb141a89789e434719aa
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 |  9:30 | What's new in Gerrit v3.0                                                                    |
 | 10:30 | Break & Networking                                                                           |
 | 10:45 | [First-class Gerrit CI integration with Checks](sessions/first-class-ci-integration.md)      |
-| 11:45 | Gerrit goes multi-site                                                                       |
+| 11:45 | [Gerrit goes multi-site](sessions/gerrit-multi-site.md)                                      |
 | 12:45 | Lunch & Networking                                                                           |
 | 14:00 | [Labels & Prolog-less submit rules](sessions/labels-and-prolog-less-submit-rules.md)         |
 | 15:00 | Gerrit at Volvo Cars                                                                         |
diff --git a/sessions/gerrit-multi-site.md b/sessions/gerrit-multi-site.md
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+# Gerrit goes Multi-site, a 100% OpenSource solution
+
+Last year we presented the vision and road-map of Gerrit multi-master
+setup at GerritHub.io.
+This year GerritForge and the Gerrit community have released the first
+version of the multi-site plugin, based on the legacy of the successful
+high-availability plugin started years ago by Ericsson.
+
+The multi-site plugin is a 100% OpenSource solution and does not require
+any proprietary software installed or hardware/software level filesystem
+replication: it is fully based on the replication, healthcheck and
+multi-site plugins.
+
+Multi-site is a journey and the Community is making big steps towards it.
+
+Let's discuss where we are in the journey to multi-site
+and what are the next steps.
+
+*[Luca Milanesio, Gerrit Maintainer / GerritForge Ltd](../speakers.md#lmilanesio)*