fix: Pass hostname from grafana, not instance for limit

rulebooks/alertmanager_listener.yml

@@ -20,7 +20,7 @@
             name: Demo - Clean Log Directory
             organization: OYS
             job_args:
-              limit: "{{ event.labels.instance }}"
+              limit: "{{ event.labels.hostname }}"
               extra_vars:
                 alertmanager_annotations: "{{ event.annotations }}"
                 alertmanager_generator_url: "{{ event.generatorURL }}"