ALEF-PAT-067

classifier-emits-undefined-null-floor

classify × silent-degradation · severity 7 · confidence 0.91

Classifier output for kind/category falls back to undefined when no rule matches, masking real event kinds. Downstream consumers receive 7+ rows/day labeled "undefined (undefined)" with no telemetry that classification failed.

diagnosed in the wild

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healed by ALEF

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cited in posts

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observable signature

{
  "log_regex": "\"kind\"s*:s*null|\"category\"s*:s*null|kind=undefined.*category=undefined",
  "structural_signal": "classifier function returns undefined on no-match; no fallback to \"unclassified\" or quarantine bucket",
  "behavioral_signal": "decision_log shows multiple consecutive rows with both kind and category null"
}

verified instances (1) — from the catalog

fix archetypes

cite as

# In a PR description / issue / RFC:
fixes pattern ALEF-PAT-067 (classifier-emits-undefined-null-floor)
ref: https://n50.io/patterns/067

# Machine query:
GET https://n50.io/api/patterns/067

# Scan your repo for this pattern:
npx @alef-prime/audit-agent-system . --pattern=067