{ "schema_version": "fwdvar_diagnostics_v4", "issues": [ { "code": "sparse_chain", "scope": "expiry", "severity": "INFO", "expiry_dt": "2026-05-05", "interval_from": null, "interval_to": null, "strike": null, "target_key": "2026-05-05", "message_short": "Sparse chain", "message_long": "Option chain is sparse (fewer strikes than normal)", "metrics": { "n_pairs_atm": 4, "min_pairs_required": 5 } }, { "code": "rejected", "scope": "expiry", "severity": "INFO", "expiry_dt": "2027-03-30", "interval_from": null, "interval_to": null, "strike": null, "target_key": "2027-03-30", "message_short": "Rejected: insufficient_strikes", "message_long": "Expiry rejected: insufficient_strikes", "metrics": { "reject_reason": "insufficient_strikes" } }, { "code": "low_source", "scope": "interval", "severity": "WARN", "expiry_dt": null, "interval_from": "2026-04-13", "interval_to": "2026-04-21", "strike": null, "target_key": "04-13\u219204-21", "message_short": "LOW confidence", "message_long": "Event 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LOW (baseline not robust)", "metrics": { "confidence": "LOW" } }, { "code": "low_source", "scope": "interval", "severity": "WARN", "expiry_dt": null, "interval_from": "2026-09-29", "interval_to": "2026-12-29", "strike": null, "target_key": "09-29\u219212-29", "message_short": "LOW confidence", "message_long": "Event confidence: LOW (baseline not robust)", "metrics": { "confidence": "LOW" } }, { "code": "elevated_fwdvol", "scope": "interval", "severity": "WARN", "expiry_dt": null, "interval_from": "2026-04-13", "interval_to": "2026-04-21", "strike": null, "target_key": "04-13\u219204-21", "message_short": "Elevated fwd vol (45.6%)", "message_long": "Forward volatility: 45.6% (threshold: 30%)", "metrics": { "fwd_vol": 0.45600827830659413, "threshold": 0.3 } }, { "code": "elevated_fwdvol", "scope": "interval", "severity": "WARN", "expiry_dt": null, "interval_from": "2026-04-21", "interval_to": "2026-04-28", "strike": null, "target_key": "04-21\u219204-28", "message_short": "Elevated fwd 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