48-Experimental Protocol Card Template v1.0 | Chapter 10 — Incident Handling & Fallback Strategy

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Chapter 10 — Incident Handling & Fallback Strategy

I. Purpose & Scope

• Classify abnormal events during observation/acquisition, define thresholds, and standardize trigger–response loops; specify fallback paths, logging conventions, and release restrictions to ensure safety, dimensional closure, and auditability.
• Applicable to timing / imaging / spectral / mixed. When path quantities (arrival time/phase) are involved, explicitly show gamma(ell) and measure d ell in text, and record delta_form ∈ {general, factored}.

II. Event Classes & Triggers

• SYNC: clock_state != locked beyond grace; |δt_abs|, |Δτ_ch|, or σ_y(τ) exceed thresholds.
• DIM: p_dim < 1 or check_dim failure; missing units/dimensions.
• SMP/PATH: f_s < 2 f_max, Δt > λ_ref/(2 c_ref), Δell > Δell_max, len(path) < 2; path–measure desynchronization.
• PAX/COH: |θ| > θ_max; or |∇ n_eff|·L_coh ≮≪ 1.
• NOISE: Q_res out of band; strong heavy tails/heteroscedasticity; ε_flux conservation broken.
• CALIB: |ts_start − calib.timestamp| > τ_calib or any u(θ_k) over limit.
• CITE/VER: ver_presence < 1, anchor coverage < 90%, external links/aliases present.
• INTG: duplicate record_id, checksum collisions, or missing critical events in audit.jsonl.

III. Fallback Matrix

IV. Operational Steps

• Detect: compute rolling Q_res, p_dim, σ_y(τ), δt_abs, Δτ_ch, ε_flux, SNR; emit heartbeat every Δt_beat and evaluate thresholds.
• Decide: match triggers from Section II to the matrix in Section III to select immediate action + fallback path.
• Switch: execute by priority (SYNC → DIM → SMP/PATH → PAX/COH → NOISE → CALIB → CITE/VER → INTG) to avoid oscillation; freeze current batch on switch.
• Log: write events (time, thresholds, pre/post configs, seeds, input hashes) to audit.jsonl; when entering Restricted, tag [Restricted] consistently.
• Reset: unfreeze the batch when recovery conditions are met; if failures ≥ N, move to human review.

V. Alignment with Gates

• Any trigger of S1–S5 (Chapter 8) immediately stops the batch and enters this chapter’s matrix; before release, pass G1–G8 again.
• During fallback, only qualitative notes and diagnostic plots may be released; no external quantitative claims.

VI. Outputs & Exports

• Reports: quality_report.json (timeline of triggers/fallbacks/recovery, exceeded values, current thresholds), updated check_dim_report.json, and audit.jsonl.
• Manifests: update manifest.yaml (see[]/references[]/version/checksum); in Restricted mode, append [Restricted] to all figure titles.

VII. Citations & Versioning

• Fixed syntax: See "<Volume> vX.Y" <Chapter> <Anchor>; prioritize P/S/M/I.
• Normative anchors (examples): EFT.WP.Core.Metrology v1.0:check_dim, EFT.WP.Metrology.TimeBase/Sync/Instrument/PathCorrection v1.0, EFT.WP.Core.Equations v1.1:S20-1/S21-2, PTN Template v1.0 Ch.5/7/8/11.
• Public releases use v1.* only; if v0.* is cited, mark “draft / non-committal”.

VIII. Machine-Readable (minimal snippets)
A. fallbacks.yaml

version: "1.0.0"

triggers:

SYNC: ["clock_unlocked","abs_t_over","skew_over","allan_over"]

DIM: ["p_dim_fail","check_dim_fail"]

SMP: ["fs_below_nyquist","Delta_ell_over","path_len_short","path_desync"]

PAX: ["theta_over","coherence_fail"]

NOISE: ["Q_res_over","flux_nonconserve"]

CALIB: ["tau_calib_expired","u_theta_over"]

CITE: ["ver_missing","anchor_coverage_low","external_link_found"]

INTG: ["record_dup","checksum_dup","audit_missing"]

actions:

sync_fallback: ["GNSS","PTP","NTP"]

switch_fullwave: true

segment_adapt: { T_coh: "shrink", L_coh: "shrink", B_coh: "increase" }

robust_substitute: ["huber","quantile"]

recalibrate: true

labels:

restricted: "[Restricted]"

B. quality_report.json (example)

{

"run_id":"01JXYZABCD...",

"timeline":[

{"t":"...","event":"clock_unlocked","level":"error"},

{"t":"...","event":"sync_fallback","to":"PTP","level":"action"},

{"t":"...","event":"p_dim_fail","level":"fatal"}

],

"metrics":{"p_dim":0.96,"Q_res":0.25,"epsilon_flux":0.03,"delta_t_abs_ns":120,"allan_1s":3e-11},

"restricted": true

}

IX. Checklist

• Thresholds and fallback configs loaded; online monitoring and heartbeat active.
• Triggers handled per Section III; all switches and pauses/resumes audited.
• In Restricted mode, all figures/results tagged [Restricted] with listed triggers.
• Before release, re-verify G1–G8; check_dim_report.json / quality_report.json / audit.jsonl updated.
• manifest.yaml fields see[]/references[]/version/checksum consistent with text; citations compliant, versions locked.