Use assert instead of fail, looks better

also set msg

roles/timesync-enabled/tasks/main.yml

@@ -1,8 +1,10 @@
 ---
-- name: Check selected  timesync daemon
-  fail:
-    fail_msg: "{{ timesync_daemon|default('No daemon') }} not supported"
-  when: timesync_daemon not in [ "busybox-ntp", "chrony", "ntp", "timesyncd" ]
+- name: Check selected timesync daemon
+  assert:
+    that:
+      - timesync_daemon in [ "busybox-ntp", "chrony", "ntp", "timesyncd" ]
+    fail_msg: '{{ timesync_daemon|default("No daemon") }} not supported'
+    success_msg: 'Found supported timesync service »{{ timesync_daemon }}«'
 
 
 - name: Include each network variables if there is no host variable