pvv-nixos-config/hosts/ildkule/services/monitoring/prometheus/postgres.nix

{
  pkgs,
  lib,
  config,
  values,
  ...
}:
let
  cfg = config.services.prometheus;
in
{
  sops.secrets = {
    "keys/postgres/postgres_exporter_env" = { };
    "keys/postgres/postgres_exporter_knakelibrak_env" = { };
  };

  services.prometheus = {
    scrapeConfigs = [
      {
        job_name = "postgres";
        scrape_interval = "15s";
        static_configs = [
          {
            targets = [ "localhost:${toString cfg.exporters.postgres.port}" ];
            labels = {
              server = "bicep";
            };
          }
        ];
      }
      {
        job_name = "postgres-knakelibrak";
        scrape_interval = "15s";
        static_configs = [
          {
            targets = [ "localhost:${toString (cfg.exporters.postgres.port + 1)}" ];
            labels = {
              server = "knakelibrak";
            };
          }
        ];
      }
    ];

    exporters.postgres = {
      enable = true;
      extraFlags = [ "--auto-discover-databases" ];
      environmentFile = config.sops.secrets."keys/postgres/postgres_exporter_env".path;
    };
  };

  systemd.services.prometheus-postgres-exporter-knakelibrak.serviceConfig =
    let
      localCfg = config.services.prometheus.exporters.postgres;
    in
    lib.recursiveUpdate config.systemd.services.prometheus-postgres-exporter.serviceConfig {
      EnvironmentFile = config.sops.secrets."keys/postgres/postgres_exporter_knakelibrak_env".path;
      ExecStart = ''
        ${pkgs.prometheus-postgres-exporter}/bin/postgres_exporter \
          --web.listen-address ${localCfg.listenAddress}:${toString (localCfg.port + 1)} \
          --web.telemetry-path ${localCfg.telemetryPath} \
          ${lib.concatStringsSep " \\\n  " localCfg.extraFlags}
      '';
    };
}