I'm not able to set a monitoring just for both of you. But I can recommend uptimerobot if http/https calls is all you need.
It's free and has lots of integrations.
I don't even have access to helios (not that I'm complaining, it's ok that you guys manage your server :) )

On Sat, 24 Jul 2021 at 13:10, Thomas Krichel <krichel@openlib.org> wrote:
  Thomas Krichel writes
>   Düben, Christian writes
>
> > I think Helos is offline. Is that intended?
>
>   No!

  It can be pinged. I did not get any warnings.

  Cezar, please reboot Helos, 2a01:4f9:2b:276c::2. Kindly set a monitor for

http://collec.repec.org

  with me and Christian as the recipient mails.


--

  Cheers,

  Thomas Krichel                  http://openlib.org/home/krichel
                                              skype:thomaskrichel