From 0bcd6def8c01fb5478621125ccdce3293d03653f Mon Sep 17 00:00:00 2001
From: Ivan Reshetnikov <ordinarydev@protonmail.com>
Date: Mon, 11 Mar 2024 22:05:46 +0500
Subject: [PATCH] feat: enable postgres exporter, group monitoring programs

---
 nixos/configuration.nix                       |  4 ++--
 nixos/databases/postgres.nix                  |  6 ++++++
 nixos/{programs => monitoring}/grafana.nix    |  0
 nixos/{programs => monitoring}/prometheus.nix | 11 +++++++++++
 4 files changed, 19 insertions(+), 2 deletions(-)
 rename nixos/{programs => monitoring}/grafana.nix (100%)
 rename nixos/{programs => monitoring}/prometheus.nix (62%)

diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 70a346a..85925b1 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -29,8 +29,8 @@
     ./programs/prosody.nix
     ./programs/yggdrasil.nix
 
-    ./programs/grafana.nix
-    ./programs/prometheus.nix
+    ./monitoring/grafana.nix
+    ./monitoring/prometheus.nix
   ];
 
   nix = {
diff --git a/nixos/databases/postgres.nix b/nixos/databases/postgres.nix
index 233641c..47fbe98 100644
--- a/nixos/databases/postgres.nix
+++ b/nixos/databases/postgres.nix
@@ -13,6 +13,7 @@
       "freshrss"
       "prosody"
       "grafana"
+      "postgres-exporter"
     ];
     ensureUsers = [
       {
@@ -60,6 +61,11 @@
         ensureDBOwnership = true;
         ensureClauses.login = true;
       }
+      {
+        name = "postgres-exporter";
+        ensureDBOwnership = true;
+        ensureClauses.login = true;
+      }
     ];
     identMap = ''
        # ArbitraryMapName systemUser DBUser
diff --git a/nixos/programs/grafana.nix b/nixos/monitoring/grafana.nix
similarity index 100%
rename from nixos/programs/grafana.nix
rename to nixos/monitoring/grafana.nix
diff --git a/nixos/programs/prometheus.nix b/nixos/monitoring/prometheus.nix
similarity index 62%
rename from nixos/programs/prometheus.nix
rename to nixos/monitoring/prometheus.nix
index 15fbfb7..1eac4dd 100644
--- a/nixos/programs/prometheus.nix
+++ b/nixos/monitoring/prometheus.nix
@@ -9,6 +9,11 @@
         enabledCollectors = [ "systemd" ];
         port = 55012;
       };
+      postgres = {
+        enable = true;
+        port = 55014;
+        dataSourceName = "user=postgres-exporter database=postgres-exporter host=/run/postgresql sslmode=disable";
+      };
     };
     
     scrapeConfigs = [
@@ -25,6 +30,12 @@
           targets = [ "127.0.0.1:55013" ];
         }];
       }
+      {
+        job_name = "postgres";
+        static_configs = [{
+          targets = [ "127.0.0.1:${toString config.services.prometheus.exporters.postgres.port}" ];
+        }];
+      }
     ];
   };
 }