{
  "plan_id": "policy_candidate_v4_rollout",
  "feature_flag": "rl_policy_router_v4",
  "policy_candidate_version": "policy_candidate_v4",
  "fallback_policy_version": "policy_stable_v3",
  "reward_card_version": "1.0.0",
  "owner": "ml-platform",
  "stages": [
    {
      "name": "shadow",
      "traffic_pct": 0,
      "min_duration_minutes": 120,
      "exit_criteria": ["trace_coverage", "reward_mean", "p95_latency_ms", "gate_parity"]
    },
    {
      "name": "pilot_5",
      "traffic_pct": 5,
      "min_duration_minutes": 240,
      "exit_criteria": ["slice_slos", "drift_score", "fallback_rate", "manual_review"]
    },
    {
      "name": "pilot_25",
      "traffic_pct": 25,
      "min_duration_minutes": 480,
      "exit_criteria": ["slice_slos", "drift_score", "cost_budget", "support_review"]
    }
  ],
  "rollback": {
    "ready": true,
    "decision": "route_all_to_fallback_policy",
    "max_minutes_to_restore": 10,
    "conditions": [
      "serving_status=block",
      "p95_latency_ms_over_slo",
      "evidence_pass_rate_below_slo",
      "population_stability_index_over_limit",
      "fallback_rate_over_limit"
    ]
  },
  "trace_sample": {
    "trace_id": "trace-001",
    "policy_version": "policy_stable_v3",
    "policy_candidate_version": "policy_candidate_v4",
    "reward_card_version": "1.0.0",
    "input_slice": "rag",
    "action": "large_reasoning_model",
    "action_probability": 0.05,
    "reward": 0.73,
    "hard_gates": {"valid_output_contract": true, "supported_claims": true},
    "latency_ms": 1900,
    "fallback_policy_version": "policy_stable_v3"
  }
}