Infrastructure · Data Structures

Anomaly

Datum whose observed value deviates from the expected baseline, triggering investigation

Definition

Mechanism

A Datum whose observed value falls outside the expected baseline by a measurable deviation score. Anomalies carry the (observed, expected, deviation) triple as first-class structure, so they can be routed, ranked, and triaged. Serves as the trigger artifact for investigation, learning, and diagnostic workflows.

Invariants

None stated.

Risks

Failure modes

None stated.

Relationships

Builds on

References

Used by

References

Monitor

Continuous observation of state over time

Reference

Data schema

{
  "type": "object",
  "required": [
    "observed_value",
    "expected_baseline",
    "deviation_score"
  ],
  "properties": {
    "observed_value": {
      "description": "The data point that triggered detection (any type)"
    },
    "expected_baseline": {
      "description": "The prediction or mean value (any type)"
    },
    "deviation_score": {
      "type": "number",
      "description": "Standard deviations (sigma) or distance metric"
    },
    "detected_at": {
      "type": "string",
      "format": "date-time"
    }
  }
}

Identity

Ref
Anomaly#4595
Sema ID
sema:Anomaly#mh:SHA-256:459522f7c0225dc99953dbd5cd6c9cbb558d914abbd9d4d979e103984e0739cc
Ring
1
Tier
1
Updated
2026-11-11
Supersedes
  • sema:Anomaly#mh:SHA-256:7987f2cd4a353f206fccd038ddac021ef849cfa58e352d2d2d7ba3850b916893