Probe Node Uptime (PNU)
The health of the eyes — uptime of the probe nodes that feed the mesh. Dark nodes are unseen surfaces.
Interpretation
This metric provides operational visibility into instrumentation mesh performance. Changes in value should be interpreted in the context of current threat levels and recent counter-operations. GOVERNOR uses this reading alongside related metrics to maintain a composite picture of directorate readiness.
Formula
Thresholds & Bands
| Band | Range | State |
|---|---|---|
| Stable | ≥ 99% | ok |
| Flapping | 95-99% | warn |
| Down | < 95% | crit |
Data Collection
Collected by the Instrumentation Mesh probe network. Each mesh node reports raw readings at its configured interval; the relay layer deduplicates and forwards to GOVERNOR for smoothing and threshold evaluation.
GOVERNOR Behavior
Stable (≥ 99%): GOVERNOR logs the reading, updates the standing dashboard, and takes no further action. Flapping (95-99%): GOVERNOR escalates to an advisory notification. The on-duty watch officer receives an alert, and the metric is flagged in the next Steward briefing if the condition persists for two consecutive reporting periods. Down (< 95%): GOVERNOR triggers an immediate escalation. The Steward is notified directly, the relevant department head is paged, and all related dashboards enter amber-alert mode until the reading recovers above the warning threshold.