Description of problem:
When using the latest version of cloud-init, cloud-init-19.4-7.el7_9.5.x86_64, DNS is not getting updated in /etc/resolv.conf. I found this KB article, https://access.redhat.com/solutions/4437221, which references this bug https://bugzilla.redhat.com/show_bug.cgi?id=1748015.

This works on VMware with cloud-init-19.4-7.el7_9.5.x86_64 but not on AWS.

Version-Release number of selected component (if applicable):
cloud-init-19.4-7.el7_9.5.x86_64

Update to cloud-init-19.4-7.el7_9.5.x86_64 from cloud-init-18.5-6.el7

Steps to Reproduce:
1. Upgrade to cloud-init-19.4-7.el7_9.5.x86_64
2. Attempt to use the cloud.cfg file attached
3. DNS will not be updated in resolv.conf

Actual results:
DNS will not be updated in resolv.conf

Expected results:
DNS will be updated in resolv.conf

Additional info:

1. DNS should be set by DHCP, but it's not.
2. Simply downgrading cloud-init to version 18.5-6.el7 is enough for it to work properly again on AWS releases.