[ansible-project] how to stuff running services into a host variable?

[Amos]

I can't seem to get this syntax correct, and at least one reference I found
produced more errors.  I'd like to create a list of all running processes.

    - name: populate running services into a list
      set_fact:
        services_running: >
          {%  if (hostvars[inventory_hostname]['services']['{{ item
}}']['state'] == 'running')  %}
                 services_running + [ '{{ item }}' ]
          {%  endif  %}
      with_items: "{{ hostvars[inventory_hostname]['services'].keys() }}"

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