modules/alloy.nix


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{
  config,
  lib,
  ...
}:
let
  cfg = config.nixfiles.modules.alloy;
in
{
  options.nixfiles.modules.alloy.enable = lib.mkEnableOption "Alloy";

  config = lib.mkIf cfg.enable {
    services.alloy.enable = true;

    environment.etc."alloy/config.alloy".text = ''
      logging {
        level  = "warn"
        format = "logfmt"
      }

      prometheus.remote_write "default" {
        endpoint {
          url = "https://${config.nixfiles.modules.mimir.domain}/api/v1/push"
        }
      }
      prometheus.exporter.self "default" { }
      prometheus.scrape "self" {
        targets    = prometheus.exporter.self.default.targets
        forward_to = [prometheus.relabel.default.receiver]
      }
      prometheus.exporter.unix "default" { }
      prometheus.scrape "unix" {
        targets    = prometheus.exporter.unix.default.targets
        forward_to = [prometheus.relabel.default.receiver]
      }
      prometheus.relabel "default" {
        rule {
          action        = "replace"
          regex         = "([^:]+):[0-9]+"
          replacement   = "$1"
          source_labels = ["__address__"]
          target_label  = "instance"
        }
        forward_to = [prometheus.remote_write.default.receiver]
      }

      loki.write "default" {
        endpoint {
          url = "https://${config.nixfiles.modules.loki.domain}/loki/api/v1/push"
        }
      }
      discovery.relabel "journal" {
        targets = []
        rule {
          source_labels = ["__journal__systemd_unit"]
          target_label  = "unit"
        }
        rule {
          source_labels = ["__journal_priority_keyword"]
          target_label  = "level"
        }
        rule {
          action = "labeldrop"
          regex  = "service_name"
        }
        rule {
          action        = "drop"
          source_labels = ["unit"]
          regex         = "^acme.*"
        }
        rule {
          action        = "drop"
          source_labels = ["unit"]
          regex         = "^home-manager.*"
        }
        rule {
          action        = "drop"
          source_labels = ["unit"]
          regex         = ".*\\.scope$"
        }
        rule {
          action        = "drop"
          source_labels = ["unit"]
          regex         = "^user@.*"
        }
        rule {
          action        = "drop"
          source_labels = ["unit"]
          regex         = "^serial-getty@.*"
        }
        rule {
          action        = "drop"
          source_labels = ["unit"]
          regex         = "^nixos-rebuild.*"
        }
      }
      loki.source.journal "default" {
        forward_to    = [loki.write.default.receiver]
        relabel_rules = discovery.relabel.journal.rules
      }
    '';
  };
}