Datasets kernel reuse inventory

All 61 top-level functions from the recorded metrics.py source are accounted for. New native diagnostics are a candidate for Methods1.3.10; publication and binary availability are separate checks.

Function	Decision	Owner / interface	Protocol decision
_nulls	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_as_2d_float	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_finite_matrix	migrate	Input adapter; explicit valid_mask + finite zero-filled matrix	No numeric zero substituted as a valid measured observation.
_axis	deprecated	Legacy compatibility only; strict axis_values + axis_basis on new native protocols	Silent fallback from malformed physical axis to indices is not admitted to shared physical protocol.
_safe_nanmean	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_safe_nanstd	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_safe_nanpercentile	migrate	Methods native aggregate; native type7 median/p95 on eligible rows	Retained only by distinct legacy/UI protocols; new shared metrics use native outputs.
_finite_values	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_finite_float	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_ratio	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_saturate	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_p95_over_median	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_robust_outlier_mask	delegate	Methods; diagnostics.spectral_events_qc	Exact median/MAD1.4826 with sample-std fallback tested on complete finite matrices; masks change eligible denominator explicitly.
_sam_to_ref	delegate	Methods; diagnostics.spectral_reference_qc	SAM radians, pairwise-valid, zero norms unavailable.
_basic_pca	replace	Methods; diagnostics.pca_reference_qc / existing FlexiblePCA	Exact diagnostic reference and original randomized fast estimator are separate declared modes.
_summary_median_p95_max	migrate	Methods aggregates + Preflight protocol; native median/p95; existing summary maximum	No Rust/Python percentile recomputation for new Methods signals.
class_balance	keep	Preflight target/task protocol; n4m_stats_group_means / descriptive class counts are different protocols	No target access in intrinsic development_real; preserve absent-class semantics.
distribution_shape	keep	Preflight target/task protocol; existing native summary is not an equivalent DAgostino omnibus test	Do not relabel moments as a normality test or imply predictive validation.
spectral_quality	replace	Methods descriptive kernels + Preflight protocol; diagnostics.spectral_noise_proxy; utilities summaries	Legacy mean-of-mean signal differs from global mean(abs(X)); saturation=max occupancy is a descriptive proxy only.
spectral_integrity	delegate	Preflight integrity protocols; integrity.missing_cells + n_cells in real QualificationReport	Mask count is not legacy nan_ratio; preserve denominator and native identity.
spectral_amplitude	keep	Preflight physical summary protocol; n4m_preflight_summary_compute; n4m_stats_group_means	Mean/variance available; physical signed AUC requires declared monotonic axis, no index-to-nm substitution.
spectral_noise	migrate	Methods + Preflight versioned descriptive protocol; diagnostics.spectral_noise_proxy	Global MAD(diff2)*1.4826/sqrt6 + signal/noise and20log10 parity; legacy bandwise estimator retained separately, not equated with SG noise.
spectral_artefacts	replace	Methods + Preflight; diagnostics.spectral_events_qc	Native pooled jump/spike fractions preserve eligible denominators; true clipping requires declared sensor bounds; observed extrema proxy separately named.
spectral_shape_metrics	keep	Preflight descriptive shape protocol; existing resampling/summary APIs are primitives, not identical edge-std heuristic	Legacy index derivatives and normalized-axis baseline remain explicitly legacy; no claim of physical curvature equivalence.
pca_outlier_metrics	delegate	Methods train-fitted diagnostics; diagnostics.pca_reference_qc; n4m_stats_pca_monitor; batch utilities.hotelling_t2/q_residuals	Choose declared train-reference vs batch vs out-of-fold monitor; no mixing fitted populations or Q-limit approximations.
reference_similarity	delegate	Methods reference diagnostics + Preflight; diagnostics.spectral_reference_qc	RMS/SAM/affine medians+p95 computed natively; mean reference or supplied frozen reference; masked rows differ explicitly from legacy column imputation.
_affine_reference_metrics	delegate	Methods; diagnostics.spectral_reference_qc	Native OLS offset/gain/residual RMS and absolute p95 delta, tested against independent lstsq.
_shift_reference_metrics	keep	Preflight alignment hypothesis protocol; n4m_transform_resampler_* is alignment operator, not identical peak/xcorr-lag heuristic	Peak locations and cross-correlation shifts are not automatically sensor wavelength drift; physical spacing must be uniform/declared.
repeatability_metrics	keep	Preflight sampling/identity protocol using native primitives; n4m_stats_group_means; diagnostics.spectral_reference_qc; native variance components	Only documented repeated-unit IDs may define groups; no biological/technical replication inferred from multiplicity.
dataset_structure_metrics	replace	Methods algorithms + Preflight representation protocol; diagnostics.local_density; n4m_preflight_nearest_neighbors; n4m_cluster_hdbscan; n4m_preflight_adjusted_rand_index	Real LOF is provided; kNN distance ratio must retain distinct proxy name. HDBSCAN is not an equivalent DBSCAN/IsolationForest implementation.
aggregate_profile_scores	keep	Consumer/Preflight findings policy; No Methods kernel: aggregation of heuristic evidence	Preserve unknown evidence and disclose heuristic scale, no calibrated probability.
_profile_scores	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
profile_score_labels	keep	Consumer presentation; No Methods numerical API	Labels belong to the UI/consumer.
metric_catalog	keep	Consumer metadata; No Methods numerical API	Metric labels/units/reasons remain versioned consumer metadata.
technology_guidance	keep	Preflight/consumer interpretation; No Methods numerical API	Technology/units/measurement protocol required; guidance is not a measured cause.
bug_method_catalog	keep	Preflight/consumer interpretation; No Methods numerical API	Hypotheses/actions are not generic numerical kernels.
_metric_value	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_signal_scale	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_snr_alert	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_metric_alert_score	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_score_level	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_score_interpretation	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
metric_score_rows	keep	Consumer presentation; No Methods numerical API	Heuristic alert scores remain labelled, missing observations stay unknown.
_diagnostic_signals	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_max_score	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_scale_score	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_sum_score	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_mean_score	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_low	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
_diagnostic_row	keep	Consumer adapter/heuristic policy; No Methods algorithm added	Pure conversion, null propagation, presentation or declared heuristic combination; no independent measured metric claim.
diagnostic_hypotheses	keep	Preflight findings protocol; No Methods numerical API	Possible causes remain heuristic signatures with unknown/unvalidated confidence; no causal probability claim.
spectral_profile	migrate	Consumer orchestration; optional QualificationReport; native metric identity/provenance	Legacy mode retained for protocol compatibility, shared mode consumes real report without recomputing provider metrics.
wavelength_spacing	keep	Preflight physical axis protocol; n4m_transform_resampler_* is an operator, not source metadata	Reject missing/nonmonotonic/unknown units for physical metrics; explicit index mode is separate.
effective_rank	delegate	Methods exact full-spectrum moments + Preflight; n4m_preflight_pca_compute{,_resolved}	Participation ratio requires true full moments. Truncated spectrum lower bound explicitly distinct; new PCA reference never fabricates full moments.
spectral_curve	keep	Consumer descriptive visualization; n4m_preflight_summary_compute only partly equivalent	Per-band5/95quantile protocol is retained in legacy visualization until an exact native multidimensional summary is qualified.
pca_score_plot	migrate	Consumer selection/projection; existing FlexiblePCA fit/transform; diagnostics.pca_reference_qc	Only subsampling/serialization belongs to consumer; fit reference remains declared, no fit-on-query.
spectral_target_correlation	keep	Preflight task-association protocol; No verified identical native endpoint	Aligned sample-level source-target association only; no out-of-sample predictive claim.
histogram_bins	keep	Consumer descriptive protocol; No verified identical native endpoint	Explicit bin-edge rules preserved; do not replace with classification bin transform.
impute_columns	keep	Calibration-owned preprocessing protocol; Native fitted preprocessing lifecycle where exact operator exists	Train-only learned fill state and all-missing behavior must be declared. New diagnostics do not silently imitate imputation.
target_shift	keep	Domains task/population protocol; n4m_stats_energy_distance / other native distribution kernels are distinct tests	KS/Wasserstein/standardized mean difference are not interchangeable with energy distance.
class_shift	keep	Domains task/population protocol; No verified identical JS-divergence endpoint	Declared class vocabulary and populations; no replacement by unrelated distance.

The JSON inventory records the source hash, ABI versions and binding feasibility. KEEP does not claim native equivalence. New additions are tested as generic procedures, without a per-binding algorithm registry. Sampling identities, possible physical causes, severity and calibrated confidence remain Preflight/Domains responsibilities.