diff --git a/services/monitoring/lgtm/grafana.nix b/services/monitoring/lgtm/grafana.nix
index 8fd2583..e567f65 100644
--- a/services/monitoring/lgtm/grafana.nix
+++ b/services/monitoring/lgtm/grafana.nix
@@ -92,6 +92,7 @@ in
                 uid = "mimir";
                 access = "proxy";
                 url = "http://127.0.0.1:9009/prometheus";
+                isDefault = true;
               }
               {
                 name = "Loki";
@@ -100,6 +101,17 @@ in
                 access = "proxy";
                 url = "http://127.0.0.1:9090/";
               }
+              {
+                name = "Mimir Alertmanager";
+                type = "alertmanager";
+                uid = "mimir-alertmanager";
+                access = "proxy";
+                url = "http://127.0.0.1:9009/";
+                jsonData = {
+                  handleGrafanaManagedAlerts = true;
+                  implementation = "mimir";
+                };
+              }
             ];
           };
         };