[Jenkins-infra] Maintenance Window - ci.jenkins.io - 2019/03/06 - 9AM UTC+2

[Olblak]

Hi Everybody, 

The platform sig <https://jenkins.io/sigs/platform/> has been working hard on running jenkins with java11 and it's now time to use it in a real life scenario. 

Adrien Lecharpentier and I will upgrade ci.jenkins.io next Monday 3th of June at 9AM UTC+2.

As usually with such maintenance, we'll communicate in different ways:
* We'll be on a call using Google Meet <https://meet.google.com/hec-yjep-how> and on irc #jenkins-infra
* We'll notify on this mail thread and update INFRA-2115 <https://issues.jenkins-ci.org/browse/INFRA-2115> when the migration is done.

In short we'll execute following steps:
* Set jenkins master in maintenance mode "Prepare for shutdown"
* Backup jenkins home
* Update JAVA_OPTS with options specific to java11
* Move from the docker image jenkins/jenkins:lts-alpine to jenkins/jenkins:jdk11
* Ensure linux/windows agents use the same major java version than master ( java 11 )

Remark: We won't (voluntarily ) modify the other jenkins instances, at least for this maintenance window.

Cheers

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