What is the suggested value for guardrail fields_per_udt_warn_threshold?

Cassandra has added guardrails feature some time ago, bust none of the guardrails have any default value set in the configuration file (see cassandra.yaml ). I generally wonder how can a db admin know what value to set for a specific guardrail, and I'm mainly interested in the values for fields_per_udt_warn_threshold and fields_per_udt_fail_threshold. Is there maybe any document with suggested values, are there actually any data that'd support choosing one value over the other? Or should we rather set these basing on a gut feeling/experience, and guardrails lack defaults, because they're very case-specific? I'm also afraid that if guardrails are disabled by default, no user/db admin will want to set them, not even mentioning a possibility of people being generally unaware of these options (there're so many in the config file already...). Even more so, if you imagine guardrails of only the warn level/soft limits breaking stuff in the long run, e.g. via clogging logs.