Merge branch 'fix-backup-duration-alert' into 'develop'

Monitoring: Fix backup duration alert

See merge request !349

nixos/modules/monitoring/server/grafana-dashboards/backups.json

@@ -638,8 +638,8 @@
             "query": {
               "params": [
                 "A",
-                "3h",
-                "now"
+                "5m",
+                "now-3h"
               ]
             },
             "reducer": {
@@ -772,8 +772,8 @@
             "query": {
               "params": [
                 "A",
-                "6h",
-                "now"
+                "5m",
+                "now-6h"
               ]
             },
             "reducer": {