How To Use Ansible Module Wait_for Together With Loop?

In Ansible 2.7.11 and wanted to use the module waif_for together with loops for connection test to my System Center Operations Manager (SCOM) servers. Currently I'm using a task -

Solution 1:

After consulting with colleagues it turned out that the list (of servers) wasn't defined correctly in inventory, just a classical syntax error. Please see Ansible, how to define a list in host inventory?.

To get it working it is necessary to define in inventory file the variable as

SCOM_MGMT_SRV_PROD="['server1','server2','server3','server4']"

instead of an just comma separated list of strings and use for loop

loop: "{{ SCOM_MGMT_SRV_PROD }}"

By doing this I've realized that actually the debug message wasn't iterating over the list either. Now it is working properly

TASK [debug] ************************************************************************************************************************
ok: [host] => (item=server1) => {
    "msg": "server1"
}
ok: [host] => (item=server2) => {
    "msg": "server2"
}
ok: [host] => (item=server3) => {
    "msg": "server3"
}
ok: [host] => (item=server4) => {
    "msg": "server4"
}

TASK [Test connection to SCOM_MGMT_SRV_PROD: ['server1','server2','server3','server4']] ***
ok: [host] => (item=server1)
ok: [host] => (item=server2)
ok: [host] => (item=server3)
ok: [host] => (item=server4)

Solution 2:

Meanwhile I've found out that it is possible to Looping over inventory and if I use

with_items:"{{ groups['SCOM_MGMT_SRV_PROD'] }}"

together with a group in inventory file

[SCOM_MGMT_SRV_PROD]
server1
server2
server3
server4

Since the monitoring servers are not part of infrastructure which is maintained by Ansible, Linux admins, etc., I do not like to include them in the inventory other than in a variable.

Are there any other options to loop over a variable list of servers? ... if not, it might be necessary to go with this as solution.