AxBalancerRouteStats

type AxBalancerRouteStats = Readonly<{
  failureEwma: number;
  logLatencyM2: number;
  logLatencyMean: number;
  observations: number;
  successes: number;
  version: 1;
}>;

Defined in: https://github.com/ax-llm/ax/blob/e4219a44b7581a55a40d9dd62d2c281062ff078d/src/ax/ai/balance_adaptive.ts#L36

Versioned route state used by adaptive balancing.

Successful latency is stored in log space using Welford’s online mean and M2. The balancer combines those values with a Normal-Inverse-Gamma prior at selection time.