Investigation report
Question: This production metric comes with the alerts its original detector fired. Review that detector's work: where are the real anomalies, and was it right to page anyone?
Provider: openai-compatible:google/gemini-3.1-flash-lite, 9 turns, 7 tool calls.
The original production detector fired 42 alerts [T2]. A review of these against secondary, independent detectors reveals that many of the original alerts were likely noisy, while some significant anomalies were potentially overlooked or poorly characterized.
Analysis of Anomalies
I used band_breach and robust_zscore to re-evaluate the data.
- Significant Anomalies (Late Series): The most substantial anomalies occur toward the end of the series, specifically in the range 10400-11000.
band_breachflagged multiple sustained episodes in this region with an alarm budget of 0, indicating they are statistically highly significant relative to the vendor-provided forecast band [T4].robust_zscoreindependently confirms major amplitude excursions in these same regions (e.g., 10459-10523 and 10750-10926) [T5]. Figure 1 (rendered for the range 10400-11000) highlights the severity of these deviations [T6]. - Original Detector Performance: The original detector was often fragmented, firing many short, isolated alerts (e.g., 1-2 points in length) [T2]. While these captures reflect some instability, they likely resulted in alert fatigue. The sustained, high-magnitude shifts identified by my detectors near the end of the series appear to be the most critical operational issues.
- False Positives/Noise: Many of the alerts fired earlier in the series (e.g., May 23-27) had very short durations [T2]. When compared against the
flatlinedetector, which identified distinct periods of signal collapse [T7], it becomes clear the original detector was picking up minor fluctuations that did not necessarily represent systemic failures.
Conclusion
The original detector was overly sensitive to minor, short-term noise, leading to a high number of alerts. However, it did correctly identify the major disruptions occurring late in the series (starting around index 10463 and 10716) [T2, T4, T5]. The paging strategy for this detector likely needs tuning to ignore sub-5-minute noise and focus on these sustained departures from the forecast band.
{"findings": [{"start": 10463, "end": 10635, "type": "band_breach", "summary": "A major sustained excursion from the forecast band, confirmed by robust_zscore.", "evidence": ["T4", "T5", "T6"]}, {"start": 10715, "end": 10928, "type": "band_breach", "summary": "A significant, prolonged deviation from the forecast band, representing a severe operational anomaly.", "evidence": ["T4", "T5", "T6"]}]}
Provenance check
17 numeric claims checked, 0 unsupported (0.0%), 5 weakly supported (29.4%).
| number | verdict | sentence |
|---|---|---|
| 42 | verified | The original production detector fired 42 alerts [T2]. |
| 10400 | uncited-but-present | * Significant Anomalies (Late Series): The most substantial anomalies occur toward the end of the ser... |
| 11000 | uncited-but-present | * Significant Anomalies (Late Series): The most substantial anomalies occur toward the end of the ser... |
| 0, | verified | band_breach flagged multiple sustained episodes in this region with an alarm budget of 0, indicating they... |
| 10459 | verified | robust_zscore independently confirms major amplitude excursions in these same regions (e.g., 10459-10523 ... |
| 10523 | verified | robust_zscore independently confirms major amplitude excursions in these same regions (e.g., 10459-10523 ... |
| 10750 | verified | robust_zscore independently confirms major amplitude excursions in these same regions (e.g., 10459-10523 ... |
| 10926 | verified | robust_zscore independently confirms major amplitude excursions in these same regions (e.g., 10459-10523 ... |
| 10400 | verified | Figure 1 (rendered for the range 10400-11000) highlights the severity of these deviations [T6]. |
| 11000 | verified | Figure 1 (rendered for the range 10400-11000) highlights the severity of these deviations [T6]. |
| 1 | verified | * Original Detector Performance: The original detector was often fragmented, firing many short, isola... |
| 2 | verified | * Original Detector Performance: The original detector was often fragmented, firing many short, isola... |
| 23 | verified | * False Positives/Noise: Many of the alerts fired earlier in the series (e.g., May 23-27) had very sh... |
| 27 | verified | * False Positives/Noise: Many of the alerts fired earlier in the series (e.g., May 23-27) had very sh... |
| 10463 | uncited-but-present | However, it did correctly identify the major disruptions occurring late in the series (starting around inde... |
| 10716 | uncited-but-present | However, it did correctly identify the major disruptions occurring late in the series (starting around inde... |
| 5 | uncited-but-present | The paging strategy for this detector likely needs tuning to ignore sub-5-minute noise and focus on these s... |
Verdicts: verified (in the cited tool result), derived (sum or difference of cited values), wrong-citation (exists in another tool result than the one cited), uncited-but-present (no citation given), unsupported (nowhere in the tool log: treat as hallucinated until shown otherwise).
Figures
