1{ lib }:
 2{
 3  # Filter machines with node exporters
 4  # Excludes non-NixOS machines, mobile devices, and machines without network config
 5  machinesWithNodeExporter =
 6    machines:
 7    lib.filterAttrs (
 8      name: machine:
 9      # Has network configuration with names (indicates it's a real host)
10      (machine ? net && machine.net ? names)
11      # Exclude mobile devices and tablets
12      && !(builtins.elem name [
13        "hokkaido"
14        "suzu"
15        "osaka"
16      ])
17      # Exclude non-NixOS machines that don't run node exporter
18      && !(builtins.elem name [
19        "synodine"
20        "hass"
21        "wakasu"
22      ])
23    ) machines;
24
25  # Generate Prometheus targets from machine list
26  # Returns list of "hostname.domain:port" strings
27  mkPrometheusTargets =
28    {
29      machines,
30      domain ? "sbr.pm",
31      port,
32    }:
33    lib.mapAttrsToList (name: _machine: "${name}.${domain}:${toString port}") machines;
34}