Hi @WMDE-leszek and @Addshore,
we thought about and added to the Topics and created (superficial) task for the things we deem needed before go live (mind you, this ticket is restricted to the traffic btw. mw and the node service, explicitly _not_ the other direction).
Could you please have a look at the questions indicated in red and see if you already have answers, or can point us to someone at the wmf to dive into these issues with?

Thanks

I had a quick chat with @Addshore, and I'll try to point to WMF teams we believe are the best suited to provide information on those topics, the particular team member who is to our knowledge the best suited/approachable (e.g. based in Europe) in the particular topic area, and also IRC channels where teams in questions are generally present. This if of course does not mean IRC is the only way to get answers, and the mentioned individuals are the ones you must be in contact with.
Email addresses of WMF staff can be found through the staff page https://wikimediafoundation.org/role/staff-contractors/

• TLS => question to ops: how is this configured?
• log download time => question to ops: can we get these metrics somewhere on the network level?

Those two should be under the responsibility of "Site Reliability Engineering" team. The possible contact person could be Giuseppe L. He goes as _joe_ on IRC, or as Joe here in phabricator. Team's IRC channel is #wikimedia-serviceops.

• configure helm T215921 question to ops: helm help, anyone? Configure /healthcheck to yield a useful result (e.g. during start, on graceful shutdown)

That seems like the responsibility of the "Release Engineering" team. The person with helm expertise is definitely Tyler C. He goes as thcipriani on IRC and phabricator. He is unfortunately not based inside Europe timezones as far as I know. IRC channel of the channel is #wikimedia-releng.