@JsonProperty
    public int size() {
        return size;
    }
A PayloadGenerator which generates a timestamped uniform random payload.

This generator generates pseudo-random payloads that can be reproduced from run to run.
The guarantees are the same as those of java.util.Random.

The timestamp used for this class is in milliseconds since epoch, encoded directly to the first several bytes of the
payload.

This should be used in conjunction with TimestampRecordProcessor in the Consumer to measure true end-to-end latency
of a system.

`size` - The size in bytes of each message.
`seed` - Used to initialize Random() to remove some non-determinism.

Here is an example spec:

{
   "type": "timestampRandom",
   "size": 512
}

This will generate a 512-byte random message with the first several bytes encoded with the timestamp.
trogdor/src/main/java/org/apache/kafka/trogdor/workload/TimestampRandomPayloadGenerator.java