1 files changed, 88 insertions, 0 deletions
diff --git a/nixos/modules/services/monitoring/prometheus/exporters/varnish.nix b/nixos/modules/services/monitoring/prometheus/exporters/varnish.nix
new file mode 100644
index 00000000000..5b5a6e18fcd
--- /dev/null
+++ b/nixos/modules/services/monitoring/prometheus/exporters/varnish.nix
@@ -0,0 +1,88 @@
+{ config, lib, pkgs, options }:
+
+with lib;
+
+let
+  cfg = config.services.prometheus.exporters.varnish;
+in
+{
+  port = 9131;
+  extraOpts = {
+    noExit = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Do not exit server on Varnish scrape errors.
+      '';
+    };
+    withGoMetrics = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Export go runtime and http handler metrics.
+      '';
+    };
+    verbose = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Enable verbose logging.
+      '';
+    };
+    raw = mkOption {
+      type = types.bool;
+      default = false;
+      description = ''
+        Enable raw stdout logging without timestamps.
+      '';
+    };
+    varnishStatPath = mkOption {
+      type = types.str;
+      default = "varnishstat";
+      description = ''
+        Path to varnishstat.
+      '';
+    };
+    instance = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = ''
+        varnishstat -n value.
+      '';
+    };
+    healthPath = mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = ''
+        Path under which to expose healthcheck. Disabled unless configured.
+      '';
+    };
+    telemetryPath = mkOption {
+      type = types.str;
+      default = "/metrics";
+      description = ''
+        Path under which to expose metrics.
+      '';
+    };
+  };
+  serviceOpts = {
+    path = [ pkgs.varnish ];
+    serviceConfig = {
+      RestartSec = mkDefault 1;
+      DynamicUser = false;
+      ExecStart = ''
+        ${pkgs.prometheus-varnish-exporter}/bin/prometheus_varnish_exporter \
+          --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \
+          --web.telemetry-path ${cfg.telemetryPath} \
+          --varnishstat-path ${escapeShellArg cfg.varnishStatPath} \
+          ${concatStringsSep " \\\n  " (cfg.extraFlags
+            ++ optional (cfg.healthPath != null) "--web.health-path ${cfg.healthPath}"
+            ++ optional (cfg.instance != null) "-n ${escapeShellArg cfg.instance}"
+            ++ optional cfg.noExit "--no-exit"
+            ++ optional cfg.withGoMetrics "--with-go-metrics"
+            ++ optional cfg.verbose "--verbose"
+            ++ optional cfg.raw "--raw")}
+      '';
+    };
+  };
+}