Drop Notice logs when rendering as json?

[waipeng]

Affected Puppet, Ruby, OS and module versions/distributions

• Puppet: 7.34.0
• Ruby: 2.7.8
• Distribution: Ubuntu 22.04.5 LTS
• Module version: 4.1.0

How to reproduce (e.g Puppet code you use)

 puppet catalog diff --confdir /etc/puppetlabs/puppet --render-as json puppet:/enva puppet:/envb --node_list server1.example.com                                                                                                                                                                                                    
Notice: Add --debug for realtime output, add --render-as {json,yaml} for parsed output                                                                                                                                
Notice: Add --debug for realtime output, add --render-as {json,yaml} for parsed output                                                                                                                               
{"server1.example.com":{"old_version":"1733993846","new_version":"1733993829","old_environment":"enva","new_environment":"envb", ...}                 

(server hostname and environment names have been changed to protect the innocent)

What are you seeing

Notice: logs, before the json, which makes it hard to dump the output to a json parser

What behaviour did you expect instead

Just json

Output log

Any additional information you'd like to impart

I would like to have catalog diff as part of CI / CD workflow, taking the json output from this and parsing it and displaying the diffs to users. However, there is an annoying Notice debug log which makes it hard for such a workflow (It can be worked around, of course).

I am wondering if I am calling it wrongly, should I have redirected logs to somewhere else? Trying --logdest didn't work.

Alternatively, can such Notice be dropped in a --render-as (or even totally) so as not to pollute the output? I don't see this message as particularly useful, users who need info should be able to use puppet catalog diff --help.