elb_target_group to support slow start attribute

[yravid]

SUMMARY

Have the option to configure slow start duration attribute

ISSUE TYPE

• Feature Idea

COMPONENT NAME

elb_target_group

ADDITIONAL INFORMATION

see 'slow_start.duration_seconds ' in https://docs.aws.amazon.com/cli/latest/reference/elbv2/modify-target-group-attributes.html

- name: Create a target group with slow start duration attribute
  community.aws.elb_target_group:
    name: mytargetgroup
    protocol: http
    port: 80
    vpc_id: vpc-01234567
    slow_start_duration: 30
    state: present

[markuman]

Is this attribute supported by all loadbalancers? ALB, Classic, Network...?
I Cannot find any informations.
If yes - it might be easy to implement.

[yravid]

Only for ALB, from the doc:
The following attributes are supported only if the load balancer is an Application Load Balancer and the target is an instance or an IP address

[markuman]

The big problem imho is, that we don't know if a target group is actually attached to an ALB, Classic LB or Network LB.
Similar to: #282
I need to make some tests...

[ansibullbot]

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