Add default monitoring configuration

[reardencode]

I don't think that nix-bitcoin should go so far as to install a complete monitoring and visualization stack, but some basic service status alerting could be really useful.

One example of how this can be achieved is:

https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/blob/master/default.nix#L576

[mmilata]

Would be nice to provide prometheus exporters, personally I'd run prometheus+grafana on separate machine:

• https://github.com/jvstein/bitcoin-prometheus-exporter
• https://github.com/lightningd/plugins/tree/master/prometheus (c-lightning plugins #71 related)
• lnd has built-in exporter which has to be enabled at compile time

[jonasnick]

As far as I know monit can only send alerts via email. That's easy to do from a mail server, but not for us really.

I have a prometheus + grafana setup with lnd. You can change the package used by the lnd module with the package option in order to use an lnd with the compilation flag enabled. However, the default metrics it exports are not useful. You really want https://github.com/lightninglabs/lndmon too. I'm relatively happy with that setup (though lndmon should export more things), prometheus queries and alerting through grafana is quite powerful.

Perhaps we should 1) make it easy to enable prometheus exporters and 2) add an option that enables a prometheus/grafana setup that "just works".

[mmilata]

Opened nixpkgs PR for the bitcoind exporter: NixOS/nixpkgs#89267 It's probably more convenient to have it in nixpkgs because there's already a bunch of infrastructure for exporters that I'm not sure can be used from the outside. It's not hard to make it into standalone module though, let me know if there's interest.

[nixbitcoin]

ACK standalone module and "just works" setup

[mmilata]

lndmon package + module: NixOS/nixpkgs#89449. Let me know if you'd like to become comaintainer.

[nixbitcoin]

IMO we should limit the scope and just make it a matrix or mail notification whenever a systemd service goes down.

[joaothallis]

IMO we should limit the scope and just make it a matrix or mail notification whenever a systemd service goes down.

Using Prometheus Sever + Systemd exporter + Alertmanager (prometheus) we can achieve mail notification using a standard monitoring stack. What do you think?

This stack is already present in NixOS:

• Prometheus Server can be enabled with services.prometheus.enable = true;
• Systemd Exporter use the services.prometheus.exporters.systemd module.
• Alertmanager module

With this stack the project or the user can increment enabling other exporters as the ones mentioned by @mmilata and @jonasnick

I have a prometheus + grafana setup with lnd.

@jonasnick do you have Alertmanager configured to send mail using Nix?

[jonasnick]

@joaothallis That sounds like a reasonable stack. I don't have my setup anymore but I used the alerting system built into grafana.

Would you suggest documenting this stack or add a dedicated module? The advantage of #472 is that it already adds some basic alerting rules.