misc/metrics-exporters: move to base

base/default.nix

@@ -25,6 +25,9 @@
     ./services/nginx.nix
     ./services/openssh.nix
     ./services/postfix.nix
+    ./services/prometheus-node-exporter.nix
+    ./services/prometheus-systemd-exporter.nix
+    ./services/promtail.nix
     ./services/smartd.nix
     ./services/thermald.nix
     ./services/userborn.nix

base/services/prometheus-node-exporter.nix

@@ -0,0 +1,23 @@
+{ config, lib, values, ... }:
+let
+  cfg = config.services.prometheus.exporters.node;
+in
+{
+  services.prometheus.exporters.node = {
+    enable = lib.mkDefault true;
+    port = 9100;
+    enabledCollectors = [ "systemd" ];
+  };
+
+  systemd.services.prometheus-node-exporter.serviceConfig = lib.mkIf cfg.enable {
+    IPAddressDeny = "any";
+    IPAddressAllow = [
+      "127.0.0.1"
+      "::1"
+      values.hosts.ildkule.ipv4
+      values.hosts.ildkule.ipv6
+    ];
+  };
+
+  networking.firewall.allowedTCPPorts = lib.mkIf cfg.enable [ cfg.port ];
+}

base/services/prometheus-systemd-exporter.nix

@@ -0,0 +1,26 @@
+{ config, lib, values, ... }:
+let
+  cfg = config.services.prometheus.exporters.systemd;
+in
+{
+  services.prometheus.exporters.systemd = {
+    enable = lib.mkDefault true;
+    port = 9101;
+    extraFlags = [
+      "--systemd.collector.enable-restart-count"
+      "--systemd.collector.enable-ip-accounting"
+    ];
+  };
+
+  systemd.services.prometheus-systemd-exporter.serviceConfig = {
+    IPAddressDeny = "any";
+    IPAddressAllow = [
+      "127.0.0.1"
+      "::1"
+      values.hosts.ildkule.ipv4
+      values.hosts.ildkule.ipv6
+    ];
+  };
+
+  networking.firewall.allowedTCPPorts = lib.mkIf cfg.enable [ cfg.port ];
+}

base/services/promtail.nix

@@ -0,0 +1,38 @@
+{ config, lib, values, ... }:
+let
+  cfg = config.services.prometheus.exporters.node;
+in
+{
+  services.promtail = {
+    enable = lib.mkDefault true;
+    configuration = {
+      server = {
+        http_listen_port = 28183;
+        grpc_listen_port = 0;
+      };
+      clients = [{
+        url = "http://ildkule.pvv.ntnu.no:3100/loki/api/v1/push";
+      }];
+      scrape_configs = [{
+        job_name = "systemd-journal";
+        journal = {
+          max_age = "12h";
+          labels = {
+            job = "systemd-journal";
+            host = config.networking.hostName;
+          };
+        };
+        relabel_configs = [
+          {
+            source_labels = [ "__journal__systemd_unit" ];
+            target_label = "unit";
+          }
+          {
+            source_labels = [ "__journal_priority_keyword" ];
+            target_label = "level";
+          }
+        ];
+      }];
+    };
+  };
+}