@yagoaparecidoti
A] Generally /config/topics/ will store all topic level configuration if you have set any.
For example:
If you have set any topic level setting then it will be stored there:
[zk: node1.zookeeper-hostname.com:2181(CONNECTED) 6] get /kafka/config/topics/ATLAS_HOOK
{"version":1,"config":{"retention.ms":"2678400000","cleanup.policy":"compact"}}
[zk:node1.zookeeper-hostname.com:2181(CONNECTED) 7]
Here topic level settings are retention.ms and cleanup.policy=compact
As it has only topic-level configuration details it will not affect the Kafka cluster or applications if applications are not dependent on any topic-level settings.
B] There is no standard Kafka tool which you can use to restore /config/topics but you can easily alter/set topic level settings using the Kafka command below as per your retirement if any.
kafka-configs --zookeeper <ZK_host>:2181/kafka --entity-type topics --entity-name <topic_name> --alter --add-config <configname & value>
Note: Replace all required settings and /kafka (/kafka can be checked from CM >> Kafka >> Conf >> zookeeper.chroot) in the above command
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