From f97ab24f47539952bb4350028484a466fe4ce06d Mon Sep 17 00:00:00 2001
From: arcnmx <git@git.arcn.mx>
Date: Fri, 31 May 2024 16:56:54 -0700
Subject: [PATCH] feat(monitoring): customize metrics ingest path

---
 modules/nixos/monitoring/ingest/prometheus.nix | 11 ++++++++---
 modules/system/exports/monitoring.nix          |  5 ++++-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/modules/nixos/monitoring/ingest/prometheus.nix b/modules/nixos/monitoring/ingest/prometheus.nix
index 7936f8b4..809618b8 100644
--- a/modules/nixos/monitoring/ingest/prometheus.nix
+++ b/modules/nixos/monitoring/ingest/prometheus.nix
@@ -5,8 +5,8 @@
   ...
 }: let
   inherit (gensokyo-zone) systems;
-  inherit (gensokyo-zone.lib) mkAddress6;
-  inherit (lib.modules) mkDefault;
+  inherit (gensokyo-zone.lib) mkAddress6 mapOptionDefaults;
+  inherit (lib.modules) mkIf mkMerge mkDefault mkOptionDefault;
   inherit (lib.attrsets) attrValues;
   inherit (lib.lists) filter concatMap;
   nodeExporterSystems =
@@ -35,7 +35,12 @@
     static_configs = [
       {
         inherit targets;
-        labels = mkDefault service.prometheus.exporter.labels;
+        labels = mkMerge [
+          (mapOptionDefaults service.prometheus.exporter.labels)
+          (mkIf (service.prometheus.exporter.metricsPath != "/metrics") {
+            __metrics_path__ = mkOptionDefault service.prometheus.exporter.metricsPath;
+          })
+        ];
       }
     ];
   };
diff --git a/modules/system/exports/monitoring.nix b/modules/system/exports/monitoring.nix
index f7d23598..c03d9716 100644
--- a/modules/system/exports/monitoring.nix
+++ b/modules/system/exports/monitoring.nix
@@ -28,6 +28,10 @@ let
           labels = mkOption {
             type = attrsOf str;
           };
+          metricsPath = mkOption {
+            type = str;
+            default = "/metrics";
+          };
         };
       };
       ports = mkOption {
@@ -183,7 +187,6 @@ in
           };
         };
         promtail = {config, ...}: {
-          id = mkAlmostOptionDefault "promtail";
           nixos = {
             serviceAttr = "promtail";
             assertions = mkIf config.enable [