self-hosting/modules/grafana.nix

{ config, ... }:
{

  sops.secrets = {
    grafanaAdminPassword = {
      owner = config.users.users.grafana.name;
      key = "grafana/admin_password";
    };
  };


  services.grafana = {
    enable = true;
    domain = "grafana.${config.networking.domain}";
    security.adminPasswordFile = config.sops.secrets.grafanaAdminPassword.path;
    dataDir = "/nix/var/data/grafana";
    provision = {
      enable = true;
      datasources = [
        {
          name = "Prometheus";
          type = "prometheus";
          url = "http://127.0.0.1:${toString config.services.prometheus.port}";
          isDefault = true;
        }
        {
          name = "Loki";
          type = "loki";
          access = "proxy";
          url = "http://127.0.0.1:${toString config.services.loki.configuration.server.http_listen_port}";
        }
      ];
      dashboards = [
        {
          name = "Config";
          options.path = ./dashboards;
        }
      ];
    };
  };

  services.nginx = {
    virtualHosts = {
      "${config.services.grafana.domain}" = {

        enableACME = true;
        forceSSL = true;

        locations."/" = {
          proxyPass = "http://127.0.0.1:${toString config.services.grafana.port}";
          proxyWebsockets = true;
        };
      };
    };
  };

  services.prometheus = {
    enable = true;

    scrapeConfigs = [
      {
        job_name = "node";
        static_configs = [{
          targets = [
            "10.0.2.3:${toString config.services.prometheus.exporters.node.port}"
            "10.0.1.1:${toString config.services.prometheus.exporters.node.port}"
            "10.0.1.11:${toString config.services.prometheus.exporters.node.port}"
          ];
        }];
      }
    ];
  };

  services.loki = {
    enable = true;

    dataDir = "/nix/var/data/loki";

    configuration = {
      server.http_listen_port = 3100;
      auth_enabled = false;

      ingester = {
        lifecycler = {
          address = "127.0.0.1";
          ring = {
            kvstore = {
              store = "inmemory";
            };
            replication_factor = 1;
          };
        };
        chunk_idle_period = "1h";
        max_chunk_age = "1h";
        chunk_target_size = 999999;
        chunk_retain_period = "30s";
        max_transfer_retries = 0;
      };

      limits_config = {
        ingestion_rate_mb = 16;
      };

      schema_config = {
        configs = [{
          from = "2022-09-15";
          store = "boltdb-shipper";
          object_store = "filesystem";
          schema = "v11";
          index = {
            prefix = "index_";
            period = "24h";
          };
        }];
      };

      storage_config = {
        boltdb_shipper = {
          active_index_directory = "${config.services.loki.dataDir}/boltdb-index";
          cache_location = "${config.services.loki.dataDir}/boltdb-cache";
          cache_ttl = "24h";
          shared_store = "filesystem";
        };

        filesystem = {
          directory = "${config.services.loki.dataDir}/chunks";
        };
      };

      limits_config = {
        reject_old_samples = true;
        reject_old_samples_max_age = "168h";
      };

      chunk_store_config = {
        max_look_back_period = "0s";
      };

      table_manager = {
        retention_deletes_enabled = false;
        retention_period = "0s";
      };

      compactor = {
        working_directory = "${config.services.loki.dataDir}";
        shared_store = "filesystem";
        compactor_ring = {
          kvstore = {
            store = "inmemory";
          };
        };
      };

      analytics = {
        reporting_enabled = false;
      };
    };
  };
}