@Override
    public String toString() {
        return "TopicStatus{" +
                "topic='" + topic + '\'' +
                ", connector='" + connector + '\'' +
                ", task=" + task +
                ", discoverTimestamp=" + discoverTimestamp +
                '}';
    }
Get a timestamp that represents when this topic was discovered as being actively used by
this connector.

@return the discovery timestamp
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/TopicStatus.java