Module metrics 

Telemetry and metrics collection (feature-gated). Telemetry and metrics collection for SLO assessment and escalation operations.

This module provides structured metrics for monitoring SLO-driven acquisition decisions. Metrics are collected optionally (feature-gated) to provide observability without overhead when disabled.

Metrics Types

• slo_assessment_count: Counter of investigations with SLO assessment
• escalation_triggered_count: Counter of escalations (warning + critical)
• blocked_ratio_histogram: Distribution of blocked ratios observed
• target_class_distribution: Breakdown by target class (API, ContentSite, HighSecurity, Unknown)
• escalation_level_distribution: Breakdown by escalation level (Acceptable, Medium, High)

Usage (Feature-Gated)

When the metrics feature is enabled:

use stygian_charon::metrics::MetricsCollector;

let collector = MetricsCollector::new();
let report = investigate_har(&har)?;
let requirements = infer_requirements_with_target_class(&report, TargetClass::Api);
collector.record_assessment(&report, &requirements);

Metrics can be exported to Prometheus format:

println!("{}", collector.to_prometheus());

Structs

MetricsCollector

Global metrics collector for SLO assessment operations.