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Description of problem:
It would be nice to add in the man page that the default output format is JSON.

Version-Release number of selected component (if applicable):
# rpm -qa | grep ipa-server
ipa-server-common-4.8.0-11.module+el8.1.0+4247+9f3fd721.noarch
ipa-server-4.8.0-11.module+el8.1.0+4247+9f3fd721.x86_64
#

How reproducible:
Always.

Steps to Reproduce:
# ipa-healthcheck --help

Actual results:
...
json:
  Output information in JSON format

  --indent INDENT       Indention level of JSON output

human:
  Display output in a more human-friendly way
...

Expected results:
...
json:
  Output information in JSON format ( this is the default ).

  --indent INDENT       Indention level of JSON output
...

Additional info:

Fixed in upstream: 4defcc17f6e1ac181e07d792082eb5ee6982280c

Tested on RHEL8.4

[root@server1 ~]# cat /etc/redhat-release 
Red Hat Enterprise Linux release 8.4 Beta (Ootpa)
[root@server1 ~]# rpm -q ipa-server ipa-healthcheck
ipa-server-4.9.0-0.5.rc3.module+el8.4.0+9124+ced20601.x86_64
ipa-healthcheck-0.7-3.module+el8.4.0+9007+5084bdd8.noarch

#man ipa-healthcheck

--output-type=TYPE
  Set the output type. Supported variants are human and json. The default is
json.

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 (Moderate: idm:DL1 and idm:client security, 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/RHSA-2021:1846