From 5d80f6ec0fa2e05dfbb3d0d173d8a3118239635b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Kier=C3=A1n=20Meinhardt?= <kmein@posteo.de>
Date: Tue, 28 Oct 2025 19:08:54 +0100
Subject: [PATCH] alertmanager: alert when mastodon is down

---
 systems/makanek/monitoring/default.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/systems/makanek/monitoring/default.nix b/systems/makanek/monitoring/default.nix
index e68806d..25d7964 100644
--- a/systems/makanek/monitoring/default.nix
+++ b/systems/makanek/monitoring/default.nix
@@ -187,7 +187,7 @@ in
               }
               {
                 alert = "Mastodon";
-                expr = ''probe_success{instance="https://social.krebsco.de"}'';
+                expr = ''probe_success{instance="https://social.krebsco.de"} == 0'';
                 for = "5m";
                 annotations.description = "Mastodon instance {{$labels.instance}} is down";
               }