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4 backends with random service times. Watch distribution and queue depths.
What you're seeing
Round-robin: simple, ignores backend load. Least connections: routes to least busy. Random: stateless, statistically OK. Weighted: respects backend capacity.
Real load balancers (Envoy, HAProxy, NLB) often combine algorithms with health checks. Least-conn with EWMA latency is the modern default.
★ KEY TAKEAWAY
Round-robin: simple, blind. Least-conn: smart, slow under spikes. Random: stateless, decent. Weighted: respects backend capacity.
▶ WHAT TO TRY
- Click Burst 30 requests.
- Switch algorithms — see which keeps backends balanced.