Ansible notify restart when a file changed - ansible

Question

I try to restart a docker for specific item on inventory (aa,bb) when the file changed with copy module. If the copy changed the file so it trigger a handler to restart the specific item. The copy works but the handler is never trigger.
instances.yml
instances:
aa:
name: "aa"
bb:
name: "bb"
playbook.yml
- name: Copy config
copy:
src: "roles/{{ item.value.name }}.yaml"
dest: "etc/{{ item.value.name }}.yaml"
with_dict: "{{ instances1 }}"
register: template
notify:
- my_handler
handlers/main.yml
- name: my_handler
shell: "notify {{ item.key }}"
with_items: "{{ template.results | selectattr('changed', 'equalto', true) | map(attribute='item')| list }}"

Answer 1

A functional sample:
/my_project
|playbook.yml
|--/roles
| |--/test
| |--/tasks
| | main.yml
| |
| |--/handlers
| | main.yml
| |
| |--/files
| | aa.yaml
| | bb.yam
playbook.yml
- hosts: localhost
gather_facts: false
roles:
- test
In folder my_project/roles/test/tasks: main.yml
- name: Copy config
copy:
src: "{{ item.value.name }}.yaml"
dest: "zzz{{ item.value.name }}.txt"
with_dict: "{{ instances }}"
register: template
vars:
instances:
aa:
name: "aa"
bb:
name: "bb"
notify:
- my_handler
- name: Force all notified handlers to run at this point, not waiting for normal sync points
meta: flush_handlers
In folder my_project/roles/test/handlers: main.yml
- name: my_handler
debug:
msg: notify called {{ item }}
with_items: "{{ template.results | selectattr('changed', 'equalto', true) | map(attribute='item')| list }}"
Result:
RUNNING HANDLER [test : my_handler]
ok: [localhost] => (item={'key': 'aa', 'value': {'name': 'aa'}}) => {
"msg": "notify called {'key': 'aa', 'value': {'name': 'aa'}}"
}
ok: [localhost] => (item={'key': 'bb', 'value': {'name': 'bb'}}) => {
"msg": "notify called {'key': 'bb', 'value': {'name': 'bb'}}"
}
to execute Handlers at once add task meta: flush_handlers