refactor: make db-size collector reusable

1 files changed, 22 insertions, 0 deletions

diff --git a/nixos/shared/postgres-collectors.nix b/nixos/shared/postgres-collectors.nix
new file mode 100644
index 0000000..fd44cb0
--- /dev/null
+++ b/nixos/shared/postgres-collectors.nix
@@ -0,0 +1,22 @@
+# collectors for the prometheus-sql-exporter
+{ config, lib, pkgs, ... }:
+
+{
+  collectorNames = ["db-sizes"];
+
+  collectors = [
+    {
+      collector_name = "db-sizes";
+      metrics = [
+        {
+          metric_name = "pg_db_size_bytes";
+          help = "disk space used by the database";
+          type = "gauge";
+          key_labels = ["database_name"];
+          values = ["size"];
+          query = "SELECT datname AS database_name, pg_database_size(datname) as size from pg_database";
+        }
+      ];
+    }
+  ];
+}