jsonlogencoding only handles the first log record's body of the pdata logs payload

[atoulme]

          Well, sure, but could you possibly marshal them all individually and send back the data as separate payloads? You are going to force customers to have one log record per payload which is a bit of a trap. The same feedback applies to `jsonlogencoding`, looks like. I will open an issue for that.

Originally posted by @atoulme in #34047 (comment)

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