b4024aa690
- Add HTTP OTLP exporter (opentelemetry-otlp 0.31) via SdkTracerProvider + BatchSpanProcessor + tracing_opentelemetry layer - Add Prometheus /metrics handler via metrics-exporter-prometheus 0.13 - Replace slog with tracing throughout: HttpMetrics, TracingSpanMiddleware - Replace .init() with .try_init() to allow OTLP layer registration after init_tracing_subscriber() - otlp.rs: SpanExporter::builder().with_http().with_endpoint(), Resource::builder().with_service_name(), .with_attribute(KeyValue::new(...)) - prometheus_exporter.rs: install_recorder(), prometheus_handler(), spawn_http_metrics_poller()
64 lines
1.9 KiB
Rust
64 lines
1.9 KiB
Rust
//! Tracing subscriber initialisation with JSON output.
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//!
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//! Uses `tracing_subscriber::fmt` with a custom `Make` impl that injects
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//! `instance_id` into every log line.
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use once_cell::sync::Lazy;
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use std::str::FromStr;
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use tracing_subscriber::{
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fmt::{self, format::FmtSpan},
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layer::SubscriberExt,
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util::SubscriberInitExt,
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EnvFilter,
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};
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/// Global instance identifier, resolved once at startup.
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/// Priority: `INSTANCE_ID` env var → system hostname → `"unknown"`.
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pub static INSTANCE_ID: Lazy<String> = Lazy::new(|| {
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std::env::var("INSTANCE_ID")
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.ok()
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.filter(|s| !s.is_empty())
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.or_else(|| {
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hostname::get()
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.ok()
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.and_then(|h| h.into_string().ok())
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.filter(|s| !s.is_empty())
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})
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.unwrap_or_else(|| "unknown".to_string())
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});
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/// Returns the platform-wide instance identifier for this process.
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pub fn instance_id() -> String {
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INSTANCE_ID.clone()
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}
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/// Initialises the global tracing subscriber with JSON-formatted output to stderr.
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///
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/// Each JSON line includes `ts`, `level`, `target` (module), `fields` (structured kv),
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/// `line`, `file`, and `instance_id`.
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/// `RUST_LOG` env var controls the log level filter.
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pub fn init_tracing_subscriber(level: &str) {
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let env_filter = EnvFilter::try_from_default_env()
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.or_else(|_| EnvFilter::from_str(level))
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.expect("invalid log level");
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let fmt_layer = fmt::layer()
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.json()
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.with_target(true)
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.with_thread_ids(false)
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.with_file(true)
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.with_line_number(true)
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.with_span_events(FmtSpan::CLOSE)
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.flatten_event(true);
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let registry = tracing_subscriber::registry()
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.with(env_filter)
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.with(fmt_layer);
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// try_init only fails if a global is already set — this is safe when
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// init_otlp() is also called (it rebuilds the subscriber with OTLP layers).
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let _ = registry.try_init();
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}
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