Add an example json-file log line to the documentation.

[bermudezmt]

Problem description

Follow-up to #8207
Need to reflect on @thaJeztah 's comment and have a follow-up discussion on how to handle this appropriately within the docs: #8207 (comment)

[docker-robott]

There hasn't been any activity on this issue for a long time.
If the problem is still relevant, mark the issue as fresh with a /remove-lifecycle stale comment.
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/lifecycle stale

[thaJeztah]

/lifecycle frozen