Hi there!

Next Monday 2019-10-28 @ 14:30 UTC we will do a maintenance operation on
Toolforge which consists in rebuilding the main front proxy [0] used to serve
webservices. We expect this to be done within a 30 minutes window.

The operation consists on replacing the old virtual machines supporting the
proxy (currently running Debian Jessie) with more modern instances running
Debian Buster. Both Grid/Kubernetes backends are affected by this change. We
don't expect a lot of service downtime, but there is a key point in the
operation which is migrating data stored in Redis which can be tricky. The o

Examples of things affected by this change:

* Browsing Toolforge webservices
* Browsing to https://tools.wmflabs.org/<toolname>
* Browsing to https://tools.wmflabs.org/admin/ (Toolforge landing page)
* Browsing PAWS (to some extent, since it shares part of the toolforge proxy)

Example of things not affected by this change:

* webservices backend operations
* SSH bastions
* grid queues, grid jobs
* wiki-replicas, toolsdb
* other CloudVPS projects

regards.

[0] https://phabricator.wikimedia.org/T235627

--
Arturo Borrero Gonzalez
SRE / Wikimedia Cloud Services
Wikimedia Foundation

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