IY
Нужно пройтись по одному элементу(connection_name) из списка словарей(params_servers) и на выходе получить список вида:
connection1,
connection2
---
- hosts: localhost
vars:
params_servers:
- connection_name: connection1
connection_port: 55
connection_param: fast
- connection_name: connection2
connection_port: 56
connection_param: silent
tasks:
- name: set_fact connection_name_list
set_fact:
connection_name_list: "{{ connection_name_list|default([]) + item.connection_name }}"
loop: "{{ params_servers }}"
- name:
debug:
msg: "{{ connection_name_list }}"
...
item.connection_name
]