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ANW-37 Telemetry: request metrics + selective traces over OTLP

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Optional OTLP export of request-level metrics (request and response-byte
counters keyed by route/status/conditional-GET, a duration histogram out
to 600s) plus server spans for slow or 5xx requests, nested under the
incoming W3C trace context. Off unless an OTLP endpoint or uptrace DSN is
configured; a config-less server is byte-for-byte unchanged.
This commit is contained in:
Andreas Brenner 2026-07-24 20:29:06 +03:00
parent b271d57cbb
commit 23ce90e103
9 changed files with 2014 additions and 55 deletions
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26
src/main.rs
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@ -5,9 +5,12 @@
mod cli;
use std::sync::Arc;
use anwesen::app::Anwesen;
use anwesen::doctor;
use anwesen::merge;
use anwesen::telemetry::{self, RawTelemetryArgs, TelemetryConfig};
use anyhow::Result;
use clap::Parser;
use hydra::Application;
@ -15,21 +18,36 @@ use hydra::Application;
use crate::cli::{Cli, Command};
// Result is retained at the binary boundary per [[ADR-001 Language and
// Foundation Libraries]] (anyhow at main); current stubs do not yet
// surface errors.
#[allow(clippy::unnecessary_wraps)]
// Foundation Libraries]] (anyhow at main); telemetry config resolution and
// exporter setup surface startup errors through it.
fn main() -> Result<()> {
let cli = Cli::parse();
match cli.command {
Command::Serve(args) => {
init_logging(args.log_level);
// Resolve telemetry config before the supervisor starts; an
// unset endpoint leaves it `None` (export off, behaves as today).
let telemetry = match TelemetryConfig::resolve(RawTelemetryArgs {
uptrace_dsn: args.uptrace_dsn,
otlp_endpoint: args.otlp_endpoint,
otlp_headers: args.otlp_headers,
slow_request_ms: args.otlp_slow_request_ms,
})? {
Some(cfg) => Some(Arc::new(telemetry::init(cfg)?)),
None => None,
};
tracing::info!(
vault = %args.vault.display(),
bind = %args.bind,
telemetry = telemetry.is_some(),
"anwesen serve: starting supervisor tree"
);
// Blocks until the supervisor exits (SIGTERM / SIGINT / crash).
Anwesen::new(args.vault, args.bind).run();
Anwesen::new(args.vault, args.bind, telemetry.clone()).run();
// Flush and shut down exporters after the server loop returns.
if let Some(telemetry) = telemetry {
telemetry.shutdown();
}
}
Command::Doctor(args) => {
init_logging(args.log_level);