in flink-connector-rabbitmq/src/main/java/org/apache/flink/streaming/connectors/rabbitmq/common/RMQConnectionConfig.java [544:548]
public Builder setDeliveryTimeout(long deliveryTimeout) {
Preconditions.checkArgument(deliveryTimeout > 0, "deliveryTimeout must be positive");
this.deliveryTimeout = deliveryTimeout;
return this;
}