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Description of problem:
The installer should warn the user when a deprecated anaconda boot argument is used. See warning messages from the current Rawhide as an example:

....
[    5.883298] dracut-cmdline[279]: Warning: 'dns' is deprecated. Using 'nameserver=4.0.9.6' instead.
...
Starting installer, one moment...
16:05:07 Boot argument 'text' is deprecated and will be removed in the future. Please use 'inst.text' instead.
anaconda 34.10-1.fc34 for Fedora Rawhide (pre-release) started.
...

Version-Release number of selected component (if applicable):
RHEL-8.3 GA
anaconda-33.16.3.26-1.el8

How reproducible:
Always

Steps to Reproduce:
1. Start the installation using a deprecated anaconda boot argument (for example "text dns=4.0.9.6")

Actual results:
Lack of warning messages displayed to the user.

Expected results:
Warning messages are printed for deprecated boot arguments, like in the Rawhide example above.

Upstream PR: 
https://github.com/rhinstaller/anaconda/pull/2786
https://github.com/rhinstaller/anaconda/pull/2879

PR: https://github.com/rhinstaller/anaconda/pull/3117

Tested using RHEL-8.4.0-20210210.d.2 with anaconda-33.16.4.11-1.el8 according to comment #0.
The depracated message was clearly described, seting Verified: Tested.

Added doc text. Set that as Enhacement because it's not a bug and I think they should be shown in the release notes.

I hope the doc type is correct.

Looks great to me. Thanks!

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (anaconda bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1844