From 2c8ecb9c7b0513e8735a16c59cb55b1c8925e6e2 Mon Sep 17 00:00:00 2001
From: SebastianStork <git@sstork.dev>
Date: Tue, 10 Mar 2026 20:15:51 +0100
Subject: [PATCH] alertmanager: Add inhibit rules for InstanceDown alerts

---
 modules/nixos/services/alertmanager.nix | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/modules/nixos/services/alertmanager.nix b/modules/nixos/services/alertmanager.nix
index 88bb9b7..f483fae 100644
--- a/modules/nixos/services/alertmanager.nix
+++ b/modules/nixos/services/alertmanager.nix
@@ -63,6 +63,14 @@ in
             name = "ntfy";
             webhook_configs = lib.singleton { url = "http://localhost:${toString cfg.ntfyBridgePort}/hook"; };
           };
+          inhibit_rules = lib.singleton {
+            source_matchers = [
+              ''alertname="InstanceDown"''
+              ''job="node"''
+            ];
+            target_matchers = lib.singleton ''alertname!="InstanceDown"'';
+            equal = [ "instance" ];
+          };
         };
       };