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Description of problem:
YUM4 / DNF uses the "upgrade" command to upgrade packages. The "update" command is deprecated and is only supported for backward compatibility. The "update" command is alias to "upgrade".
However, microdnf only supports the deprecated "update" command.

How reproducible:
Command: "microdnf upgrade something"
returns: "error: Unknown command: 'upgrade'"

Actual results:
Microdnf only supports the old "update" command. Support for the "upgrade" command is missing.

Expected results:
Compatible with YUM4 / DNF. -> Microdnf supports the "upgrade" command. The "update" command is still supported for backward compatibility.

PR: https://github.com/rpm-software-management/microdnf/pull/93

Could you extend ci-dnf-stack to test the microdnf upgrade command, please?

Re #comment 2
Yes
I prepared CI tests for the "upgrade" command PR: https://github.com/rpm-software-management/ci-dnf-stack/pull/932

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 (microdnf 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-2021:1721