public Builder setTime(Time time) {
            this.time = time;
            return this;
        }
The MetadataLoader follows changes provided by a RaftClient, and packages them into metadata
deltas and images that can be consumed by publishers.

The Loader maintains its own thread, which is used to make all callbacks into publishers. If a
publisher A is installed before B, A will receive all callbacks before B. This is also true if
A and B are installed as part of a list [A, B].

Publishers should not modify any data structures passed to them.

It is possible to change the list of publishers dynamically over time. Whenever a new publisher is
added, it receives a catch-up delta which contains the full state. Any publisher installed when the
loader is closed will itself be closed.
metadata/src/main/java/org/apache/kafka/image/loader/MetadataLoader.java