Add talk about healthcheck and multi-site by Tony and Luca

Change-Id: I35e8b29e6f441fd07a11994eb3807bcb1abec109

schedule.md

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 | 14:45 | [Gerrit adoption and NoteDb migration user story](sessions/gerrit-user-story.md)
 | 15:30 | Break & Networking
 | 16:00 | [Using Gerrit with Zuul](sessions/gerrit-and-zuul.md)
-| 16:45 | __Talk available__
+| 16:45 | [How healthcheck and multi-site saves keep your sleep at night](sessions/healthcheck-multi-site-keep-sleep-at-night.md))
 | 17:30 | Party and free drinks
 
 ### Friday, 11th of November

sessions/healthcheck-multi-site-keep-sleep-at-night.md

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+# How the healthcheck plugin and multi-site keep your sleep at night
+
+GerritHub.io had an outage on the 3rd of November at 15:20 GMT, which
+was caused by a [critical Gerrit issue](https://bugs.chromium.org/p/gerrit/issues/detail?id=16384)
+discovered that day.
+
+The issue was deep into the core of Gerrit, involving loading the
+accounts external-ids, impacting pretty much anything that required
+authenticated traffic.  However, none of the GerritHub.io users
+noticed any issues, delays, slow down, or reduced functionality.
+
+In this talk, Tony and Luca will describe what happened and how
+the GerritForge Team detected, analyzed, and mitigated the problem,
+avoiding a global outage.
+
+The learnings from this story can help other Gerrit admins to
+set up operating practices about metrics, high availability,
+and service resilience with Gerrit that can be useful in
+preventing sleepless nights and managing outages.
+
+*[Luca Milanesio, GerritForge](../speakers.md#lmilanesio)*
+*[Antonio Barone, GerritForge](../speakers.md#abarone)*