Tom Prince authored 3 years ago and Florian Sesser committed 3 years ago

This includes the host-based metrics collector, and the VPN client setup (including key deployment).

... and fix that option the other commit introduced

OMG look at teh genius of it

Do some name resolution for those poor computers

Improve factoring by removing those `/etc/hosts` entries

And avoid the infinite loop @tomprince was encountering in !258

Should be pure refactoring

This is my latest version of this, updated to work with the
packages in NixOS 21.05.

Take what I learned from @tomprince in
https://whetstone.privatestorage.io/privatestorage/PrivateStorageio/-/merge_requests/220#note_17605 :
Assigning a service a `startAt' will make timer.target start it,
no need to also have it `wantedBy' multiuser.target.

Also add megacli2prom to the path even if it should be already because
of megacli2prom.  Better be safe than sorry.

Thanks go out to @tomprince!

Tryfix the starting of the timer before tahoe is updated.

Thanks to @tomprince for the suggestion.

The Blackbox exporter can be used to check whether some services do answer;
We'll use it for our HTTPS endpoints.
Especially handy is it's checking for TLS cert expiry.

- Add node exporter to nodes
- Make the old nixpkgs 19.09 node exporter work (amend config)
- Fix a typo (??) and exclude monitoringvpn in network traffic graphs to prevent double counting