Success rate outlier detection catches gradual performance degradation

Hosts with success rate more than success_rate_stdev_factor standard deviations below cluster mean (default 1.9 std devs) are ejected during each interval window. Requires minimum success_rate_minimum_hosts (3) and success_rate_request_volume (100) to calculate. Catches gradual degradation that consecutive failure thresholds miss.

Investigate gradually degrading host for resource exhaustion (CPU, memory, disk I/O), memory leaks, connection pool depletion, or garbage collection pressure. Review application performance metrics. Compare degraded host against healthy cluster members. Monitor ejections_success_rate metric. Ensure success_rate_request_volume threshold is appropriate for traffic levels.