From c43ccffcb881046ac1f4431108d71521f35110cc Mon Sep 17 00:00:00 2001
From: Adithya Nair <adtya@adtya.xyz>
Date: Sat, 20 Jul 2024 20:15:41 +0530
Subject: [PATCH] wynne: enable postgresql_exporter

---
 hosts/shared/prometheus-exporters.nix    | 8 +++++++-
 hosts/wynne/services/apps/postgresql.nix | 6 ++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/hosts/shared/prometheus-exporters.nix b/hosts/shared/prometheus-exporters.nix
index 4b8395f..747cf5a 100644
--- a/hosts/shared/prometheus-exporters.nix
+++ b/hosts/shared/prometheus-exporters.nix
@@ -1,4 +1,4 @@
-{ config, ... }: {
+{ lib, config, ... }: {
   services = {
     caddy = {
       virtualHosts."${config.networking.hostName}.labs.adtya.xyz" = {
@@ -10,6 +10,12 @@
             uri replace /systemd-metrics /metrics
             reverse_proxy 127.0.0.1:9558
           }
+          ${lib.optionalString config.services.prometheus.exporters.postgres.enable ''
+          handle /postgres-metrics {
+            uri replace /postgres-metrics /metrics
+            reverse_proxy ${config.services.prometheus.exporters.postgres.listenAddress}:${toString config.services.prometheus.exporters.postgres.port}
+          }
+          ''}
           tls /persist/secrets/caddy/certs/default.crt /persist/secrets/caddy/certs/default.key
         '';
       };
diff --git a/hosts/wynne/services/apps/postgresql.nix b/hosts/wynne/services/apps/postgresql.nix
index f3f864c..b9023a8 100644
--- a/hosts/wynne/services/apps/postgresql.nix
+++ b/hosts/wynne/services/apps/postgresql.nix
@@ -1,5 +1,11 @@
 { config, pkgs, ... }: {
   services = {
+    prometheus.exporters.postgres = {
+      enable = true;
+      listenAddress = "127.0.0.1";
+      port = 9187;
+      runAsLocalSuperUser = true;
+    };
     postgresql = {
       enable = true;
       dataDir = "/mnt/data/postgresql/${config.services.postgresql.package.psqlSchema}";