task_role.yml

---
- hosts: group
  gather_facts: true
  tasks:
     - set_fact:
        down: "{{ansible_play_hosts_all|difference(ansible_play_hosts) }}"

     - debug:
         var: down
       run_once: true 

     - name: mail
       mail:
        host: smtp.mail.com
        port: 25
        from: mail1@mail.com
        username: mail1@mail.com
        password: password1
        to: mail1@mail.com
        subject: Ansible Fail
        body:  Hello, Issue connectio ansible {{ down }}
       delegate_to: localhost
       run_once: true
       when:  down != None 

     - block:
        - include_role:
            name: role_1
            tasks_from: "{{ item }}"
          loop:
            - task1
            - task2
      rescue:
        - name: mail
          mail: smtp.mail.com
           host: 
           port: 25
           from: mail1@mail.com
           username: mail1@mail.com
           password: password1
           to: mail1@mail.com
           subject: Ansible Report {{ ansible_hostname }}
           body:  Ansible ansible  {{ ansible_hostname }} Fail. Task {{ ansible_failed_task.name }}
          delegate_to: localhost