From ff088a9e46318f63f0c5db825d6d5ece1dfdec52 Mon Sep 17 00:00:00 2001
From: Martin Fischer <martin@push-f.com>
Date: Tue, 23 Dec 2025 12:55:07 +0100
Subject: fix: set loki retention period to 1 year

---
 nixos/hosts/tente/default.nix | 4 ++++
 nixos/shared/monitoring.nix   | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/nixos/hosts/tente/default.nix b/nixos/hosts/tente/default.nix
index 9a6d504..82bd498 100644
--- a/nixos/hosts/tente/default.nix
+++ b/nixos/hosts/tente/default.nix
@@ -128,6 +128,10 @@ in
   monitoring = {
     alloyUiPort = ports.grafanaAlloy;
     lokiPort = ports.grafanaLoki;
+    lokiRetentionStream = [
+      # TODO: set same retention for nginx logs in loki and logrotate
+      # (set up recording rule in Loki so we can still have some stats longer than that)
+    ];
     prometheusPort = ports.prometheus;
     prometheusNodeExporterPort = ports.prometheusNodeExporter;
   };
diff --git a/nixos/shared/monitoring.nix b/nixos/shared/monitoring.nix
index eecad59..5ef10a6 100644
--- a/nixos/shared/monitoring.nix
+++ b/nixos/shared/monitoring.nix
@@ -9,6 +9,10 @@ in
     lokiPort = lib.mkOption {
       type = lib.types.int;
     };
+    lokiRetentionStream = lib.mkOption {
+      type = lib.types.listOf lib.types.attrs;
+      default = [];
+    };
     alloyUiPort = lib.mkOption {
       type = lib.types.int;
     };
@@ -83,9 +87,13 @@ in
 
         compactor = {
           working_directory = "/var/lib/loki";
+          retention_enabled = true;
+          delete_request_store = "filesystem";
         };
 
         limits_config = {
+          retention_period = "${toString (24*365)}h";
+          retention_stream = cfg.lokiRetentionStream;
           allow_structured_metadata = true;
         };
       };
-- 
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