Apparently reloading knot is not enough with some config changes (e.g. listen-address), restart instead

roles/knot/handlers/main.yml

@@ -4,3 +4,8 @@
   service:
     name: knot
     state: reloaded
+
+- name: restart knot
+  service:
+    name: knot
+    state: restarted

roles/knot/tasks/config.yml

@@ -9,4 +9,4 @@
     mode: 0640
   vars:
     zones: "{{ hostvars[inventory_hostname] | dict2items | selectattr('key', 'match', '^knot_zone_.+$') | map(attribute='value') | list }}"
-  notify: reload knot
+  notify: restart knot