@Override
    public int compareTo(RandomizedWeightedBalancer randomizedWeightedBalancer) {
        return Integer.compare(tier, randomizedWeightedBalancer.tier);
    }
Load balancer distributes load in the proportion of probability of upstream weights.
The higher upstream weight, the higher probability the upstream takes more load.
server/src/main/java/com/epam/aidial/core/server/upstream/RandomizedWeightedBalancer.java