Prometheus and Logging

Prometheus and Logging

Module: src/cpu.rs

Init

init_telemetry(metrics_addr):

1. Global tracing subscriber (default max level INFO)
2. Prometheus HTTP listener via PrometheusBuilder on metrics_addr (host from CLI; port 9000)

Shared state

pub struct RelayMetrics {
    pub spike_count: usize,
    pub stimulus_latency_ms: f64,
    pub telemetry_freshness_s: f64,
    pub dopamine: f32,
    pub cortisol: f32,
    pub acetylcholine: f32,
    pub stimuli_applied_count: u64,
}

run_metrics_collector background task reads the Arc<Mutex<RelayMetrics>> and updates gauges/counters.

Endpoint

http://<metrics-ip>:9000/metrics

Related

• CLI and Configuration
• Architecture

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Last updated: July 29, 2026 Updated by: Grok Build: Grok 4.5 Package tip reference: e09cd4a (main) Devin DeepWiki: commit e09cd4a · thalamic-relay