From f9caa0af7f62f9c4608eb7b7d8608cc96edb6626 Mon Sep 17 00:00:00 2001
From: Tigor Hutasuhut <tigor.hutasuhut@gmail.com>
Date: Mon, 16 Sep 2024 10:32:43 +0700
Subject: [PATCH] caddy: added metrics for caddy access log

---
 system/services/caddy.nix           | 48 +++++++++++++++++++++++++++++
 system/services/telemetry/alloy.nix |  4 +++
 system/services/telemetry/loki.nix  |  2 ++
 3 files changed, 54 insertions(+)

diff --git a/system/services/caddy.nix b/system/services/caddy.nix
index 577fab2..ef5e004 100644
--- a/system/services/caddy.nix
+++ b/system/services/caddy.nix
@@ -69,5 +69,53 @@ in
           '';
       };
 
+    environment.etc."alloy/config.alloy".text =
+      /*hcl*/ ''
+      local.file_match "caddy_access_log" {
+          path_targets = [
+              {
+                  "__path__" = "/var/log/caddy/*.log",
+              },
+          ]
+          sync_period = "5s"
+      }
+
+      loki.source.file "caddy_access_log" {
+          targets = local.file_match.caddy_access_log.targets
+          forward_to = [loki.process.caddy_access_log.receiver]
+      }
+
+      loki.process "caddy_access_log" {
+          forward_to = [loki.write.default.receiver]
+
+          stage.json {
+              expressions = {
+                  level = "",
+                  host = "request.host",
+                  method = "request.method",
+                  proto = "request.proto",
+              }
+          }
+
+          stage.labels {
+              values = {
+                  level = "",
+                  host = "",
+                  method = "",
+                  proto = "",
+              }
+          }
+
+          stage.label_drop {
+            values = ["service_name"]
+          }
+
+          stage.static_labels {
+            values = {
+                job = "caddy_access_log",
+            }
+          }
+      }
+    '';
   };
 }
diff --git a/system/services/telemetry/alloy.nix b/system/services/telemetry/alloy.nix
index 250fb2d..3b95a89 100644
--- a/system/services/telemetry/alloy.nix
+++ b/system/services/telemetry/alloy.nix
@@ -51,6 +51,10 @@ in
       config.sops.templates."alloy-basic-auth".path
     ];
 
+    systemd.services.alloy.serviceConfig = {
+      User = "root";
+    };
+
 
     environment.etc."alloy/config.alloy".text =
       let
diff --git a/system/services/telemetry/loki.nix b/system/services/telemetry/loki.nix
index 7535b54..383bb5b 100644
--- a/system/services/telemetry/loki.nix
+++ b/system/services/telemetry/loki.nix
@@ -97,6 +97,8 @@ in
 
           limits_config = {
             retention_period = "90d";
+            ingestion_burst_size_mb = 64;
+            ingestion_rate_mb = 32;
           };
 
           storage_config = {