public Map<String, ?> values() {
        return new RecordingMap<>(values);
    }
If at least one key with {@code prefix} exists, all prefixed values will be parsed and put into map.
If no value with {@code prefix} exists all unprefixed values will be returned.
<p>
This is useful if one wants to allow prefixed configs to override default ones, but wants to use either
only prefixed configs or only regular configs, but not mix them.
clients/src/main/java/org/apache/kafka/common/config/AbstractConfig.java