feature: implement Adaptive load balancer with softmax selection - #9
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Description
This PR adds a new
adaptiveload balancing strategy that scores backends based on runtime metrics (latency EWMA, error rate, consecutive failures, active connections) and selects them probabilistically using softmax.Changes
AdaptiveLBimplementation ininternal/lb/adaptive.gointernal/lb/adaptive_test.goGetLoadBalancerto support"adaptive"strategyNext()to properly handle disabled backendsWhy
The adaptive strategy allows the proxy to prefer healthier backends under load, reducing latency and error rates compared to pure least-connections (as shown in earlier experiments).
Closes #6