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ANW-42 Telemetry: take export config from OTEL_ environment variables only

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Delete the uptrace DSN parser and the {endpoint}/v1/* concatenation that
produced the dead export, and build the OTLP exporters with no endpoint,
headers, or protocol so the SDK reads OTEL_EXPORTER_OTLP_* itself.

The SDK concatenates as naively as we did: measured against a local sink,
a ?query base sends POST /?query/v1/metrics and a #fragment base sends
POST /. So one check stays -- a query or fragment on
OTEL_EXPORTER_OTLP_ENDPOINT fails at startup. Per-signal variables are
used verbatim and need none.

A protocol variable is the second startup check. The exporter picks its
transport at build time and this binary ships OTLP/HTTP alone, so
OTEL_EXPORTER_OTLP_PROTOCOL=grpc kept exporting over HTTP with nothing in
the log -- the same silence this change removes.

service.name stays a default rather than policy: an attribute set on the
resource builder wins over the SDK detectors that read OTEL_SERVICE_NAME
and OTEL_RESOURCE_ATTRIBUTES, so anwesen supplies its own only for keys
the environment leaves alone.

Telemetry-off is our own check on the endpoint variables: with none set
the exporter would still build and aim at the SDK default localhost:4318.

--uptrace-dsn, --otlp-endpoint, and --otlp-header stay parsed but hidden,
so a deployment upgrading with them set fails naming the OTEL_
replacement instead of going quiet.

Assumed hidden clap stubs are the right migration shape; clap rejecting
the flags as unknown would say nothing about the replacement. Flag if a
plain unknown-argument error is wanted instead.

Assumed rejecting http/json alongside grpc is right: neither has a
transport in this build. Flag if a build with both features is wanted
instead.
This commit is contained in:
Andreas Brenner 2026-07-26 23:44:51 +03:00
parent 8894ea0c7b
commit dc113b8249
5 changed files with 563 additions and 227 deletions
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59
README.md
View file

@ -56,8 +56,7 @@ anwesen merge --vault /path/to/vault --query 'tags=adr&__anw-order=title' > ADRs
```
anwesen serve --vault <path> [--bind <addr:port>] [--log-level <level>]
[--uptrace-dsn <dsn> | --otlp-endpoint <url>]
[--otlp-header <key=value>]... [--otlp-slow-request-ms <n>]
[--otlp-slow-request-ms <n>]
anwesen doctor --vault <path>
anwesen merge --vault <path> --query <query-string>
anwesen version
@ -69,24 +68,62 @@ anwesen version
| `--bind <addr:port>` | `ANWESEN_BIND` | `127.0.0.1:8080` | Listen address for `serve`. |
| `--log-level <level>` | `ANWESEN_LOG_LEVEL` | `info` | `error`, `warn`, `info`, `debug`, or `trace`. |
| `--query <query-string>` | -- | _required for `merge`_ | A `/query` query string: frontmatter predicates plus `__anw-` controls. |
| `--uptrace-dsn <dsn>` | `ANWESEN_UPTRACE_DSN` | unset | uptrace DSN (`https://<token>@api.uptrace.dev`). Excludes `--otlp-endpoint`. |
| `--otlp-endpoint <url>` | `ANWESEN_OTLP_ENDPOINT` | unset | OTLP/HTTP base URL. Excludes `--uptrace-dsn`. |
| `--otlp-header <key=value>` | `ANWESEN_OTLP_HEADERS` | none | Extra export header, repeatable. The env var takes a comma-separated list. |
| `--otlp-slow-request-ms` | `ANWESEN_OTLP_SLOW_REQUEST_MS` | `500` | Requests at or over this duration, or answering 5xx, also export a span. |
Every flag has a matching `ANWESEN_<UPPER>` environment variable, except
`--otlp-header`, whose env var is the plural `ANWESEN_OTLP_HEADERS` because it
takes a list. CLI flags win over env vars.
Every flag has a matching `ANWESEN_<UPPER>` environment variable. CLI flags win
over env vars.
Telemetry is off unless `--uptrace-dsn` or `--otlp-endpoint` is set. With
neither, nothing is exported and no exporter is built. The four telemetry
flags apply to `serve` only.
`--bind` and `--otlp-slow-request-ms` apply to `serve` only. Where telemetry is
exported is configured entirely through the standard `OTEL_` variables below.
- **`serve`** -- run the daemon: walk the vault, build the index, watch for changes, serve the API.
- **`doctor`** -- walk the vault once and report what would stop clean ingestion: unreadable files, unparseable YAML, path collisions on the HTTP surface, and frontmatter type drift (the same key carrying incompatible types across notes). Read-only; non-zero exit if any issue is found.
- **`merge`** -- one-shot local generation: walk the vault, evaluate `--query`, and write the merged markdown document to stdout. No server, no HTTP. See [Local generation](#local-generation).
- **`version`** -- print version and exit.
## Telemetry
anwesen exports OTLP metrics for every request, and a span for requests at or
over `--otlp-slow-request-ms` or answering a 5xx. Export is configured through
the standard OpenTelemetry environment variables, which the SDK reads directly:
| Variable | Meaning |
| -------------------------------------- | ---------------------------------------------------------------- |
| `OTEL_EXPORTER_OTLP_ENDPOINT` | Base URL. The SDK appends `/v1/metrics` and `/v1/traces`. |
| `OTEL_EXPORTER_OTLP_METRICS_ENDPOINT` | Full metrics URL, used as given. Overrides the base for metrics. |
| `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT` | Full traces URL, used as given. Overrides the base for traces. |
| `OTEL_EXPORTER_OTLP_HEADERS` | Export headers, `key=value` comma-separated. |
| `OTEL_EXPORTER_OTLP_PROTOCOL` | `http/protobuf`, the default and the only value this build speaks. |
| `OTEL_SERVICE_NAME`, `OTEL_RESOURCE_ATTRIBUTES` | Override the `anwesen` service identity. |
The per-signal `OTEL_EXPORTER_OTLP_METRICS_PROTOCOL` and
`OTEL_EXPORTER_OTLP_TRACES_PROTOCOL` are read the same way.
With none of the three endpoint variables set, telemetry is off: no exporter is
built and the request middleware is not installed.
Two settings fail at startup rather than export nowhere in silence:
- A query or a fragment on `OTEL_EXPORTER_OTLP_ENDPOINT`. The base URL must be
a base URL; the SDK appends the signal path after whatever it is given.
- A protocol other than `http/protobuf`. The binary ships the OTLP/HTTP
transport alone, so `grpc` would keep exporting over HTTP with nothing in the
log. Point the endpoint at the collector's HTTP port, not its gRPC one.
uptrace:
```
OTEL_EXPORTER_OTLP_ENDPOINT=https://api.uptrace.dev
OTEL_EXPORTER_OTLP_HEADERS=uptrace-dsn=https://TOKEN@api.uptrace.dev?grpc=4317
```
Paste the DSN from Project Settings into the header verbatim, tail and all --
it is a credential there, not an address. The endpoint is the host alone.
Removed in 0.3.0: `--uptrace-dsn`, `--otlp-endpoint`, `--otlp-header` and their
`ANWESEN_` variables. Passing any of them fails at startup with the `OTEL_`
replacement to use.
## HTTP API
All endpoints are `GET` and return JSON unless noted.

63
src/cli.rs
View file

@ -4,18 +4,22 @@
//!
//! ```text
//! anwesen serve --vault <path> [--bind <addr:port>] [--log-level <level>]
//! [--uptrace-dsn <dsn> | --otlp-endpoint <url>]
//! [--otlp-header <key=value>]... [--otlp-slow-request-ms <n>]
//! [--otlp-slow-request-ms <n>]
//! anwesen doctor --vault <path> [--log-level <level>]
//! anwesen merge --vault <path> [--query <string>] [--log-level <level>]
//! anwesen version
//! ```
//!
//! `--bind` and the OTLP telemetry flags are `serve`-only ([ANW-37]);
//! `--bind` and `--otlp-slow-request-ms` are `serve`-only ([ANW-37]);
//! `doctor` and `merge` do not bind a port; `version` takes no flags. Each
//! flag has a matching `ANWESEN_<UPPER>` environment variable and CLI wins
//! over env per the manual. With no `--otlp-endpoint`/`--uptrace-dsn`,
//! telemetry is off and the server behaves exactly as without these flags.
//! over env per the manual.
//!
//! Telemetry export is configured through the standard `OTEL_EXPORTER_OTLP_*`
//! environment variables ([ANW-42](https://crvrs.youtrack.cloud/issue/ANW-42)).
//! With none of them set, telemetry is off and the server behaves as it did
//! before telemetry existed. The removed flags below are still parsed so an
//! upgrade fails loudly instead of dropping export config in silence.
use std::net::SocketAddr;
use std::path::PathBuf;
@ -56,25 +60,22 @@ pub struct ServeArgs {
#[arg(long, env = "ANWESEN_LOG_LEVEL", default_value = "info")]
pub log_level: LogLevel,
/// uptrace DSN shorthand (`https://<token>@api.uptrace.dev`), parsed
/// into the OTLP endpoint plus an `uptrace-dsn` header. Mutually
/// exclusive with --otlp-endpoint. When this and --otlp-endpoint are
/// both unset, telemetry is fully off (ANW-37).
#[arg(long, env = "ANWESEN_UPTRACE_DSN")]
/// Removed (ANW-42): use `OTEL_EXPORTER_OTLP_ENDPOINT` plus
/// `OTEL_EXPORTER_OTLP_HEADERS=uptrace-dsn=<dsn>`. Still accepted so
/// startup fails with that message rather than exporting nowhere.
#[arg(long, env = "ANWESEN_UPTRACE_DSN", hide = true)]
pub uptrace_dsn: Option<String>,
/// Generic OTLP/HTTP endpoint base URL for telemetry export. The
/// per-signal path (`/v1/metrics`, `/v1/traces`) is appended by the
/// exporter. Mutually exclusive with --uptrace-dsn.
#[arg(long, env = "ANWESEN_OTLP_ENDPOINT")]
/// Removed (ANW-42): use `OTEL_EXPORTER_OTLP_ENDPOINT`.
#[arg(long, env = "ANWESEN_OTLP_ENDPOINT", hide = true)]
pub otlp_endpoint: Option<String>,
/// Extra OTLP export header as `key=value`, repeatable. On the env var
/// (`ANWESEN_OTLP_HEADERS`) pass a comma-separated `key=value` list.
/// Removed (ANW-42): use `OTEL_EXPORTER_OTLP_HEADERS`.
#[arg(
long = "otlp-header",
env = "ANWESEN_OTLP_HEADERS",
value_delimiter = ','
value_delimiter = ',',
hide = true
)]
pub otlp_headers: Vec<String>,
@ -172,6 +173,34 @@ mod tests {
}
}
/// The removed telemetry flags still parse, hidden from `--help`. Clap
/// rejecting them as unknown would say nothing about the `OTEL_`
/// replacement; the migration error in `telemetry::TelemetryConfig`
/// needs the values to reach it (ANW-42).
#[test]
fn serve_still_parses_the_removed_telemetry_flags() {
let cli = parse(&[
"serve",
"--vault",
"/tmp/v",
"--uptrace-dsn",
"https://tok@api.uptrace.dev",
"--otlp-endpoint",
"https://collector.example.com",
"--otlp-header",
"authorization=Bearer xyz",
])
.expect("parse");
match cli.command {
Command::Serve(a) => {
assert!(a.uptrace_dsn.is_some());
assert!(a.otlp_endpoint.is_some());
assert_eq!(a.otlp_headers, vec!["authorization=Bearer xyz".to_string()]);
}
_ => panic!("expected serve"),
}
}
#[test]
fn serve_rejects_malformed_bind_at_parse_time() {
let err = parse(&["serve", "--vault", "/tmp/v", "--bind", "not-an-addr"]).unwrap_err();

19
src/http.rs
View file

@ -819,18 +819,23 @@ mod tests {
}
/// With telemetry installed, a normal request is answered byte-for-byte
/// as without it. The exporter points at an unreachable local port, so
/// export fails instantly in the background and never touches the
/// response path.
/// as without it. The test process sets no `OTEL_EXPORTER_OTLP_*`
/// variables, so the exporter aims at the SDK default and fails in the
/// background without ever touching the response path.
#[tokio::test]
async fn telemetry_layer_does_not_alter_responses() {
use crate::telemetry::{self, RawTelemetryArgs, TelemetryConfig};
use crate::telemetry::{self, OtelEnv, RawTelemetryArgs, TelemetryConfig};
let cfg = TelemetryConfig::resolve(RawTelemetryArgs {
otlp_endpoint: Some("http://127.0.0.1:9".into()),
let cfg = TelemetryConfig::resolve(
&RawTelemetryArgs {
slow_request_ms: 500,
..Default::default()
})
},
OtelEnv {
endpoint: Some("http://127.0.0.1:9".into()),
..OtelEnv::default()
},
)
.unwrap()
.expect("telemetry on");
let tel = Arc::new(telemetry::init(cfg).expect("telemetry init"));

14
src/main.rs
View file

@ -10,7 +10,7 @@ use std::sync::Arc;
use anwesen::app::Anwesen;
use anwesen::doctor;
use anwesen::merge;
use anwesen::telemetry::{self, RawTelemetryArgs, TelemetryConfig};
use anwesen::telemetry::{self, OtelEnv, RawTelemetryArgs, TelemetryConfig};
use anyhow::Result;
use clap::Parser;
use hydra::Application;
@ -25,14 +25,18 @@ fn main() -> Result<()> {
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 {
// Resolve telemetry config before the supervisor starts; no
// OTEL_EXPORTER_OTLP_* endpoint leaves it `None` (export off,
// no middleware). A removed flag is a startup error (ANW-42).
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,
})? {
},
OtelEnv::from_env(),
)? {
Some(cfg) => Some(Arc::new(telemetry::init(cfg)?)),
None => None,
};

587
src/telemetry.rs
View file

@ -12,140 +12,288 @@
//! the propagated context. Every other request stays metrics-only, so the
//! ~3.6k requests/min steady state does not drown the trace backend.
//!
//! When no OTLP endpoint (or uptrace DSN) is configured, [`init`] returns
//! Transport configuration comes from the standard `OTEL_EXPORTER_OTLP_*`
//! environment variables only, read by the `OpenTelemetry` SDK itself
//! ([ANW-42](https://crvrs.youtrack.cloud/issue/ANW-42)). anwesen parses no
//! addresses and appends no per-signal paths. It checks two things at
//! startup, both cases the SDK would otherwise export nowhere in silence:
//!
//! - `OTEL_EXPORTER_OTLP_ENDPOINT` carries no query or fragment, because the
//! SDK's own concatenation mangles those (measured against a sink: a
//! `?tail` base sends `POST /?tail/v1/metrics`, a `#frag` base sends
//! `POST /`).
//! - No protocol variable asks for anything but `http/protobuf`, the only
//! transport this binary is built with.
//!
//! When no endpoint variable is set, [`TelemetryConfig::resolve`] returns
//! `None`, the request middleware is not installed, and the server behaves
//! exactly as it did before this module existed. External installs run
//! unchanged.
//!
//! Config mirrors the gestell uptrace surface (see the gestell PDR-GES-136
//! `[otel]` section): a `uptrace_dsn` shorthand, or a generic endpoint plus
//! headers.
use std::collections::HashMap;
use std::time::{Duration, SystemTime};
use anyhow::{Context as _, anyhow, bail};
use anyhow::{Context as _, bail};
use axum::http::HeaderMap;
use opentelemetry::KeyValue;
use opentelemetry::metrics::{Counter, Histogram, MeterProvider as _};
use opentelemetry::propagation::{Extractor, TextMapPropagator};
use opentelemetry::trace::{Span, SpanKind, Tracer, TracerProvider as _};
use opentelemetry_otlp::{
MetricExporter, Protocol, SpanExporter, WithExportConfig, WithHttpConfig,
};
use opentelemetry_otlp::{MetricExporter, SpanExporter};
use opentelemetry_sdk::Resource;
use opentelemetry_sdk::metrics::{PeriodicReader, SdkMeterProvider};
use opentelemetry_sdk::propagation::TraceContextPropagator;
use opentelemetry_sdk::trace::Sampler;
use opentelemetry_sdk::trace::{SdkTracer, SdkTracerProvider};
use opentelemetry_semantic_conventions::resource::SERVICE_VERSION;
use opentelemetry_semantic_conventions::resource::{SERVICE_NAME, SERVICE_VERSION};
/// Raw telemetry options as parsed by clap on the `serve` command. Resolved
/// into an [`Option<TelemetryConfig>`] by [`TelemetryConfig::resolve`].
/// The removed telemetry options, still parsed so their presence is an error
/// rather than a silent config drop on upgrade
/// ([ANW-42](https://crvrs.youtrack.cloud/issue/ANW-42)), plus the one
/// surviving option. Resolved into an [`Option<TelemetryConfig>`] by
/// [`TelemetryConfig::resolve`].
#[derive(Debug, Default)]
pub struct RawTelemetryArgs {
/// `--uptrace-dsn` / `ANWESEN_UPTRACE_DSN`.
/// Removed `--uptrace-dsn` / `ANWESEN_UPTRACE_DSN`.
pub uptrace_dsn: Option<String>,
/// `--otlp-endpoint` / `ANWESEN_OTLP_ENDPOINT`.
/// Removed `--otlp-endpoint` / `ANWESEN_OTLP_ENDPOINT`.
pub otlp_endpoint: Option<String>,
/// `--otlp-header` / `ANWESEN_OTLP_HEADERS`, each `key=value`.
/// Removed `--otlp-header` / `ANWESEN_OTLP_HEADERS`.
pub otlp_headers: Vec<String>,
/// `--otlp-slow-request-ms` / `ANWESEN_OTLP_SLOW_REQUEST_MS`.
/// `--otlp-slow-request-ms` / `ANWESEN_OTLP_SLOW_REQUEST_MS`. Kept: it
/// decides when anwesen emits a span, not where the export goes, and no
/// standard variable covers it.
pub slow_request_ms: u64,
}
/// A resolved, telemetry-on configuration. Built only when an endpoint or a
/// DSN is present; absence is represented by `Ok(None)` from [`resolve`].
/// The OTLP transport variables the SDK reads, captured once at startup so
/// the telemetry-on decision and the startup checks stay pure functions of
/// them. Values are the raw strings; anwesen does not parse them beyond the
/// checks in [`check_generic_endpoint`] and [`check_protocols`].
#[derive(Debug, Default, Clone, PartialEq, Eq)]
pub struct OtelEnv {
/// `OTEL_EXPORTER_OTLP_ENDPOINT`: base URL, per-signal path appended by
/// the SDK.
pub endpoint: Option<String>,
/// `OTEL_EXPORTER_OTLP_METRICS_ENDPOINT`: full URL, used verbatim.
pub metrics_endpoint: Option<String>,
/// `OTEL_EXPORTER_OTLP_TRACES_ENDPOINT`: full URL, used verbatim.
pub traces_endpoint: Option<String>,
/// `OTEL_EXPORTER_OTLP_PROTOCOL`.
pub protocol: Option<String>,
/// `OTEL_EXPORTER_OTLP_METRICS_PROTOCOL`.
pub metrics_protocol: Option<String>,
/// `OTEL_EXPORTER_OTLP_TRACES_PROTOCOL`.
pub traces_protocol: Option<String>,
}
impl OtelEnv {
/// Read the transport variables from the process environment. An empty or
/// whitespace-only value counts as unset: an empty endpoint would
/// otherwise turn telemetry on and export to the SDK's `localhost:4318`
/// default.
#[must_use]
pub fn from_env() -> Self {
let var = |name: &str| {
std::env::var(name)
.ok()
.map(|v| v.trim().to_string())
.filter(|v| !v.is_empty())
};
Self {
endpoint: var("OTEL_EXPORTER_OTLP_ENDPOINT"),
metrics_endpoint: var("OTEL_EXPORTER_OTLP_METRICS_ENDPOINT"),
traces_endpoint: var("OTEL_EXPORTER_OTLP_TRACES_ENDPOINT"),
protocol: var("OTEL_EXPORTER_OTLP_PROTOCOL"),
metrics_protocol: var("OTEL_EXPORTER_OTLP_METRICS_PROTOCOL"),
traces_protocol: var("OTEL_EXPORTER_OTLP_TRACES_PROTOCOL"),
}
}
/// Whether any endpoint variable is set. No endpoint means telemetry off.
fn any_endpoint(&self) -> bool {
self.endpoint.is_some() || self.metrics_endpoint.is_some() || self.traces_endpoint.is_some()
}
/// The endpoint to name in the startup log: the generic base when set,
/// otherwise whichever per-signal URL is.
fn describe(&self) -> &str {
self.endpoint
.as_deref()
.or(self.metrics_endpoint.as_deref())
.or(self.traces_endpoint.as_deref())
.unwrap_or("")
}
}
/// A resolved, telemetry-on configuration. Built only when an endpoint
/// variable is set; absence is represented by `Ok(None)` from [`resolve`].
/// It carries no transport settings: the exporters read those from the
/// environment themselves.
///
/// [`resolve`]: TelemetryConfig::resolve
#[derive(Debug, Clone, PartialEq, Eq)]
pub struct TelemetryConfig {
/// OTLP/HTTP base URL. The exporter appends the per-signal path
/// (`/v1/metrics`, `/v1/traces`).
pub endpoint: String,
/// Export headers (for uptrace, the `uptrace-dsn` entry) as ordered
/// `(name, value)` pairs.
pub headers: Vec<(String, String)>,
/// A request at or over this duration, or answering a 5xx, is recorded
/// as a server span.
pub slow_request: Duration,
/// The transport variables, kept for the startup log line only.
env: OtelEnv,
}
impl TelemetryConfig {
/// Resolve raw clap options into an optional config.
/// Resolve the surviving option plus the OTLP transport variables into an
/// optional config.
///
/// - Both `uptrace_dsn` and `otlp_endpoint` set is an error (they are
/// two ways to name the same endpoint).
/// - Neither set means telemetry is off: `Ok(None)`.
/// - A malformed `key=value` header or an unparseable DSN is an error,
/// surfaced at startup rather than silently dropping export.
/// - A removed flag or `ANWESEN_` variable is an error naming its `OTEL_`
/// replacement: a deployment exporting today must fail one restart
/// rather than go quiet.
/// - No endpoint variable set means telemetry is off: `Ok(None)`.
/// - A query or fragment on `OTEL_EXPORTER_OTLP_ENDPOINT` is an error.
/// - A protocol this binary cannot speak is an error.
///
/// # Errors
/// Returns an error when the two endpoint sources conflict, a header is
/// not `key=value`, or the uptrace DSN cannot be parsed.
pub fn resolve(raw: RawTelemetryArgs) -> anyhow::Result<Option<Self>> {
let slow_request = Duration::from_millis(raw.slow_request_ms);
let mut headers = parse_headers(&raw.otlp_headers)?;
match (raw.uptrace_dsn, raw.otlp_endpoint) {
(Some(_), Some(_)) => {
bail!("--uptrace-dsn and --otlp-endpoint are mutually exclusive");
/// Returns an error when a removed option is present, when the generic
/// endpoint carries a query or a fragment, or when a protocol variable
/// asks for anything but `http/protobuf`.
pub fn resolve(raw: &RawTelemetryArgs, env: OtelEnv) -> anyhow::Result<Option<Self>> {
check_removed(raw)?;
if !env.any_endpoint() {
return Ok(None);
}
(Some(dsn), None) => {
let (endpoint, dsn_header) = parse_uptrace_dsn(&dsn)?;
// The DSN header leads; any explicit --otlp-header follows.
headers.insert(0, dsn_header);
if let Some(endpoint) = &env.endpoint {
check_generic_endpoint(endpoint)?;
}
check_protocols(&env)?;
Ok(Some(Self {
endpoint,
headers,
slow_request,
slow_request: Duration::from_millis(raw.slow_request_ms),
env,
}))
}
(None, Some(endpoint)) => Ok(Some(Self {
endpoint,
headers,
slow_request,
})),
(None, None) => Ok(None),
}
}
}
/// Parse `key=value` header specs. Whitespace around key and value is
/// trimmed; an empty key or a spec with no `=` is an error.
fn parse_headers(specs: &[String]) -> anyhow::Result<Vec<(String, String)>> {
let mut out = Vec::with_capacity(specs.len());
for spec in specs {
let (k, v) = spec
.split_once('=')
.ok_or_else(|| anyhow!("OTLP header {spec:?} is not key=value"))?;
let k = k.trim();
if k.is_empty() {
bail!("OTLP header {spec:?} has an empty key");
/// Fail on any removed telemetry option, naming the `OTEL_` variable that
/// replaces it. Silence is the expensive failure here: an upgrade that drops
/// the export config would stop telemetry with nothing in the log.
fn check_removed(raw: &RawTelemetryArgs) -> anyhow::Result<()> {
let removed: [(&str, &str, bool); 3] = [
(
"--uptrace-dsn / ANWESEN_UPTRACE_DSN",
"OTEL_EXPORTER_OTLP_ENDPOINT=https://api.uptrace.dev plus \
OTEL_EXPORTER_OTLP_HEADERS=uptrace-dsn=<the DSN, verbatim>",
raw.uptrace_dsn.is_some(),
),
(
"--otlp-endpoint / ANWESEN_OTLP_ENDPOINT",
"OTEL_EXPORTER_OTLP_ENDPOINT",
raw.otlp_endpoint.is_some(),
),
(
"--otlp-header / ANWESEN_OTLP_HEADERS",
"OTEL_EXPORTER_OTLP_HEADERS",
!raw.otlp_headers.is_empty(),
),
];
for (option, replacement, present) in removed {
if present {
bail!("{option} was removed in anwesen 0.3.0; use {replacement} instead");
}
out.push((k.to_string(), v.trim().to_string()));
}
Ok(out)
Ok(())
}
/// Parse an uptrace DSN (`https://<token>@host[:port]`) into the OTLP
/// endpoint base URL and the `uptrace-dsn` header uptrace expects. The full
/// DSN is echoed as the header value per uptrace's ingest contract.
fn parse_uptrace_dsn(dsn: &str) -> anyhow::Result<(String, (String, String))> {
let dsn = dsn.trim();
let (scheme, rest) = dsn
.split_once("://")
.context("uptrace DSN has no scheme (expected https://<token>@host)")?;
// Host is whatever follows the credentials `@`; a DSN with no `@` is
// treated as endpoint-only (lenient, though real uptrace DSNs carry a
// token).
let host = rest.rsplit_once('@').map_or(rest, |(_, h)| h);
let host = host.trim_end_matches('/');
if host.is_empty() {
bail!("uptrace DSN has no host");
/// Reject a query or fragment on `OTEL_EXPORTER_OTLP_ENDPOINT`. The SDK
/// appends the per-signal path to this value textually, so a `?grpc=4317`
/// tail sends `POST /?grpc=4317/v1/metrics` and a `#frag` tail sends
/// `POST /` -- both dead exports, neither logged. Measured against a sink on
/// opentelemetry-otlp 0.32 ([ANW-42]). A path prefix composes correctly and
/// is left alone.
///
/// [ANW-42]: https://crvrs.youtrack.cloud/issue/ANW-42
fn check_generic_endpoint(endpoint: &str) -> anyhow::Result<()> {
if let Some(bad) = endpoint.find(['?', '#']) {
let tail = &endpoint[bad..];
bail!(
"OTEL_EXPORTER_OTLP_ENDPOINT {endpoint:?} has a trailing {tail:?}; \
the exporter would append the signal path after it and export nowhere. \
Pass the base URL alone, and put an uptrace DSN in \
OTEL_EXPORTER_OTLP_HEADERS=uptrace-dsn=<the DSN, verbatim>"
);
}
let endpoint = format!("{scheme}://{host}");
Ok((endpoint, ("uptrace-dsn".to_string(), dsn.to_string())))
Ok(())
}
/// The one OTLP protocol this binary speaks. `opentelemetry-otlp` is built
/// with the `http-proto` feature alone (Cargo.toml), so neither `grpc` nor
/// `http/json` has a transport behind it.
const SUPPORTED_PROTOCOL: &str = "http/protobuf";
/// Reject a protocol variable this binary cannot honor. The exporter builder
/// picks its transport at compile time, so `OTEL_EXPORTER_OTLP_PROTOCOL=grpc`
/// does not switch anything: the export keeps going out as HTTP protobuf,
/// with nothing in the log (measured, [ANW-42]). An operator who follows
/// uptrace's console to the gRPC port would get exactly the dead-silent
/// export this issue exists to remove, so it fails at startup instead.
///
/// [ANW-42]: https://crvrs.youtrack.cloud/issue/ANW-42
fn check_protocols(env: &OtelEnv) -> anyhow::Result<()> {
let vars = [
("OTEL_EXPORTER_OTLP_PROTOCOL", env.protocol.as_deref()),
(
"OTEL_EXPORTER_OTLP_METRICS_PROTOCOL",
env.metrics_protocol.as_deref(),
),
(
"OTEL_EXPORTER_OTLP_TRACES_PROTOCOL",
env.traces_protocol.as_deref(),
),
];
for (name, value) in vars {
let Some(value) = value else { continue };
if value != SUPPORTED_PROTOCOL {
bail!(
"{name}={value:?} is not supported; this build speaks \
{SUPPORTED_PROTOCOL} only. Unset the variable, and point the \
endpoint at the collector's HTTP port rather than its gRPC one"
);
}
}
Ok(())
}
/// The resource attributes anwesen supplies as defaults, minus every key the
/// environment already sets.
///
/// `service.name=anwesen` and the crate version are defaults, not policy:
/// contract point 6 of [ANW-42] keeps `OTEL_SERVICE_NAME` and
/// `OTEL_RESOURCE_ATTRIBUTES` working. Attaching them unconditionally blocks
/// the override, because an attribute set on the builder wins over the one
/// the SDK's own detectors read from those variables (measured by sie).
///
/// Only key presence matters here; the values stay the SDK's to parse.
///
/// [ANW-42]: https://crvrs.youtrack.cloud/issue/ANW-42
fn default_resource_attrs(
service_name: Option<&str>,
resource_attributes: Option<&str>,
) -> Vec<KeyValue> {
let from_attrs: Vec<&str> = resource_attributes
.unwrap_or_default()
.split(',')
.filter_map(|entry| entry.split_once('='))
.map(|(key, _)| key.trim())
.collect();
let set_by_env = |key: &str| {
(key == SERVICE_NAME && service_name.is_some_and(|v| !v.trim().is_empty()))
|| from_attrs.contains(&key)
};
[
(SERVICE_NAME, "anwesen"),
(SERVICE_VERSION, env!("CARGO_PKG_VERSION")),
]
.into_iter()
.filter(|(key, _)| !set_by_env(key))
.map(|(key, value)| KeyValue::new(key, value))
.collect()
}
/// Semantic route bucket for the `http.route` label. Coarser than the axum
@ -332,28 +480,29 @@ struct TelemetryInner {
impl TelemetryInner {
fn new(config: TelemetryConfig) -> anyhow::Result<Self> {
let TelemetryConfig {
endpoint,
headers,
slow_request,
} = config;
// `.with_endpoint()` is used verbatim by the exporter (the `/v1/*`
// suffix is only auto-appended for the generic OTEL env var), so we
// append the per-signal path ourselves.
let endpoint = endpoint.trim_end_matches('/').to_string();
let header_map: HashMap<String, String> = headers.into_iter().collect();
let TelemetryConfig { slow_request, env } = config;
let resource = Resource::builder()
.with_service_name("anwesen")
.with_attribute(KeyValue::new(SERVICE_VERSION, env!("CARGO_PKG_VERSION")))
.build();
// Service identity is a default only: a key OTEL_SERVICE_NAME or
// OTEL_RESOURCE_ATTRIBUTES already carries is left to the SDK's own
// detectors, because a builder attribute would win over them.
let mut resource = Resource::builder();
for attr in default_resource_attrs(
std::env::var("OTEL_SERVICE_NAME").ok().as_deref(),
std::env::var("OTEL_RESOURCE_ATTRIBUTES").ok().as_deref(),
) {
resource = resource.with_attribute(attr);
}
let resource = resource.build();
// -- metrics: thread-based periodic reader over an OTLP/HTTP exporter.
// No endpoint, headers, or protocol here: the SDK reads
// OTEL_EXPORTER_OTLP_* itself and composes the per-signal URL
// (ANW-42). `.with_http()` picks the only transport this binary is
// built with, http/protobuf -- the default, and what anwesen sent
// before. Any other OTEL_EXPORTER_OTLP_PROTOCOL value would be
// ignored here, so `check_protocols` rejects it at startup.
let metric_exporter = MetricExporter::builder()
.with_http()
.with_protocol(Protocol::HttpBinary)
.with_endpoint(format!("{endpoint}/v1/metrics"))
.with_headers(header_map.clone())
.build()
.context("build OTLP metric exporter")?;
let reader = PeriodicReader::builder(metric_exporter)
@ -386,9 +535,6 @@ impl TelemetryInner {
// -- traces: thread-based batch processor over an OTLP/HTTP exporter.
let span_exporter = SpanExporter::builder()
.with_http()
.with_protocol(Protocol::HttpBinary)
.with_endpoint(format!("{endpoint}/v1/traces"))
.with_headers(header_map)
.build()
.context("build OTLP span exporter")?;
let tracer_provider = SdkTracerProvider::builder()
@ -401,7 +547,7 @@ impl TelemetryInner {
let tracer = tracer_provider.tracer("anwesen");
tracing::info!(
endpoint = %endpoint,
endpoint = %env.describe(),
slow_request_ms = slow_request.as_millis(),
"telemetry: OTLP export enabled"
);
@ -489,93 +635,208 @@ mod tests {
RawTelemetryArgs::default()
}
#[test]
fn resolve_off_when_nothing_set() {
let cfg = TelemetryConfig::resolve(raw()).unwrap();
assert!(cfg.is_none(), "no endpoint/DSN means telemetry off");
fn generic(endpoint: &str) -> OtelEnv {
OtelEnv {
endpoint: Some(endpoint.into()),
..OtelEnv::default()
}
}
#[test]
fn resolve_generic_endpoint() {
let cfg = TelemetryConfig::resolve(RawTelemetryArgs {
otlp_endpoint: Some("https://collector.example.com".into()),
otlp_headers: vec!["authorization=Bearer xyz".into()],
slow_request_ms: 500,
..raw()
})
.unwrap()
.expect("telemetry on");
assert_eq!(cfg.endpoint, "https://collector.example.com");
assert_eq!(
cfg.headers,
vec![("authorization".to_string(), "Bearer xyz".to_string())]
);
assert_eq!(cfg.slow_request, Duration::from_millis(500));
fn resolve_off_when_no_endpoint_variable_is_set() {
let cfg = TelemetryConfig::resolve(&raw(), OtelEnv::default()).unwrap();
assert!(cfg.is_none(), "no OTEL_ endpoint means telemetry off");
}
#[test]
fn resolve_uptrace_dsn_splits_endpoint_and_header() {
let cfg = TelemetryConfig::resolve(RawTelemetryArgs {
uptrace_dsn: Some("https://SECRET_TOKEN@api.uptrace.dev".into()),
fn resolve_on_for_each_endpoint_variable() {
let per_signal = |field: fn(&mut OtelEnv)| {
let mut env = OtelEnv::default();
field(&mut env);
env
};
for env in [
generic("https://collector.example.com"),
per_signal(|e| {
e.metrics_endpoint = Some("https://collector.example.com/v1/metrics".into());
}),
per_signal(|e| {
e.traces_endpoint = Some("https://collector.example.com/v1/traces".into());
}),
] {
let cfg = TelemetryConfig::resolve(
&RawTelemetryArgs {
slow_request_ms: 250,
..raw()
})
.unwrap()
},
env.clone(),
)
.unwrap_or_else(|e| panic!("{env:?}: {e}"))
.expect("telemetry on");
assert_eq!(cfg.endpoint, "https://api.uptrace.dev");
assert_eq!(
cfg.headers,
vec![(
"uptrace-dsn".to_string(),
"https://SECRET_TOKEN@api.uptrace.dev".to_string()
)]
);
assert_eq!(cfg.slow_request, Duration::from_millis(250));
}
}
/// The tails the SDK mangles: a query lands in the query string with the
/// signal path behind it, a fragment drops the signal path entirely.
#[test]
fn resolve_dsn_header_leads_explicit_headers() {
let cfg = TelemetryConfig::resolve(RawTelemetryArgs {
uptrace_dsn: Some("https://tok@api.uptrace.dev".into()),
otlp_headers: vec!["x-extra=1".into()],
..raw()
})
fn resolve_rejects_a_query_or_fragment_on_the_generic_endpoint() {
for endpoint in [
"https://api.uptrace.dev?grpc=4317",
"https://api.uptrace.dev/?grpc=4317",
"https://api.uptrace.dev:4318?grpc=4317",
"https://api.uptrace.dev#frag",
] {
let err = TelemetryConfig::resolve(&raw(), generic(endpoint)).unwrap_err();
assert!(err.to_string().contains("trailing"), "{endpoint}: {err}");
}
}
/// A path prefix composes correctly (`/otlp` -> `POST /otlp/v1/metrics`),
/// and the per-signal variables are used verbatim, tail and all.
#[test]
fn resolve_accepts_a_path_prefix_and_per_signal_tails() {
for env in [
generic("https://collector.example.com/otlp"),
generic("https://collector.example.com/"),
OtelEnv {
metrics_endpoint: Some("https://api.uptrace.dev/v1/metrics?grpc=4317".into()),
..OtelEnv::default()
},
] {
TelemetryConfig::resolve(&raw(), env.clone())
.unwrap_or_else(|e| panic!("{env:?}: {e}"))
.expect("telemetry on");
}
}
/// `.with_http()` fixes the transport at compile time, so a protocol this
/// build cannot speak is a dead export with nothing in the log.
#[test]
fn resolve_rejects_a_protocol_this_build_cannot_speak() {
let with_protocol = |field: fn(&mut OtelEnv)| {
let mut env = generic("https://collector.example.com");
field(&mut env);
env
};
for env in [
with_protocol(|e| e.protocol = Some("grpc".into())),
with_protocol(|e| e.protocol = Some("http/json".into())),
with_protocol(|e| e.metrics_protocol = Some("grpc".into())),
with_protocol(|e| e.traces_protocol = Some("grpc".into())),
] {
let err = TelemetryConfig::resolve(&raw(), env.clone())
.unwrap_err()
.to_string();
assert!(err.contains("http/protobuf"), "{env:?}: {err}");
}
}
/// The default protocol is the one this build speaks, so naming it
/// explicitly is not an error.
#[test]
fn resolve_accepts_the_supported_protocol_spelled_out() {
let env = OtelEnv {
protocol: Some("http/protobuf".into()),
metrics_protocol: Some("http/protobuf".into()),
..generic("https://collector.example.com")
};
TelemetryConfig::resolve(&raw(), env)
.unwrap()
.expect("telemetry on");
assert_eq!(cfg.headers[0].0, "uptrace-dsn");
assert_eq!(cfg.headers[1], ("x-extra".to_string(), "1".to_string()));
}
/// Contract point 6: `service.name` stays anwesen's default only while
/// the environment supplies none. A builder attribute wins over the SDK's
/// detectors, so the default has to step aside for the override to work.
#[test]
fn service_identity_defaults_step_aside_for_the_environment() {
let keys = |attrs: &[KeyValue]| {
attrs
.iter()
.map(|kv| kv.key.as_str().to_string())
.collect::<Vec<_>>()
};
let plain = default_resource_attrs(None, None);
assert_eq!(keys(&plain), [SERVICE_NAME, SERVICE_VERSION]);
let named = default_resource_attrs(Some("svcname-override"), None);
assert_eq!(keys(&named), [SERVICE_VERSION]);
let attrs = default_resource_attrs(
None,
Some("deployment.environment=prod,service.name=attrs-override"),
);
assert_eq!(keys(&attrs), [SERVICE_VERSION]);
let versioned = default_resource_attrs(None, Some("service.version=9.9.9"));
assert_eq!(keys(&versioned), [SERVICE_NAME]);
// An empty OTEL_SERVICE_NAME supplies nothing; the SDK ignores it too.
let empty = default_resource_attrs(Some(" "), None);
assert_eq!(keys(&empty), [SERVICE_NAME, SERVICE_VERSION]);
}
#[test]
fn resolve_rejects_both_endpoint_sources() {
let err = TelemetryConfig::resolve(RawTelemetryArgs {
fn resolve_rejects_the_removed_uptrace_dsn() {
let err = TelemetryConfig::resolve(
&RawTelemetryArgs {
uptrace_dsn: Some("https://tok@api.uptrace.dev".into()),
otlp_endpoint: Some("https://collector.example.com".into()),
..raw()
})
.unwrap_err();
assert!(err.to_string().contains("mutually exclusive"));
},
OtelEnv::default(),
)
.unwrap_err()
.to_string();
assert!(err.contains("--uptrace-dsn"), "{err}");
assert!(err.contains("OTEL_EXPORTER_OTLP_HEADERS"), "{err}");
}
#[test]
fn resolve_rejects_malformed_header() {
let err = TelemetryConfig::resolve(RawTelemetryArgs {
fn resolve_rejects_the_removed_otlp_endpoint() {
let err = TelemetryConfig::resolve(
&RawTelemetryArgs {
otlp_endpoint: Some("https://collector.example.com".into()),
otlp_headers: vec!["no-equals-sign".into()],
..raw()
})
.unwrap_err();
assert!(err.to_string().contains("key=value"));
},
OtelEnv::default(),
)
.unwrap_err()
.to_string();
assert!(err.contains("--otlp-endpoint"), "{err}");
assert!(err.contains("OTEL_EXPORTER_OTLP_ENDPOINT"), "{err}");
}
#[test]
fn resolve_rejects_dsn_without_scheme() {
let err = TelemetryConfig::resolve(RawTelemetryArgs {
uptrace_dsn: Some("tok@api.uptrace.dev".into()),
fn resolve_rejects_the_removed_otlp_header() {
let err = TelemetryConfig::resolve(
&RawTelemetryArgs {
otlp_headers: vec!["authorization=Bearer xyz".into()],
..raw()
})
},
OtelEnv::default(),
)
.unwrap_err()
.to_string();
assert!(err.contains("--otlp-header"), "{err}");
assert!(err.contains("OTEL_EXPORTER_OTLP_HEADERS"), "{err}");
}
/// A removed option fails even with a correct `OTEL_` endpoint alongside
/// it: the operator's intent is in the flag, and half-applied config is
/// the silent failure this issue removes.
#[test]
fn resolve_rejects_a_removed_option_alongside_a_good_endpoint() {
let err = TelemetryConfig::resolve(
&RawTelemetryArgs {
uptrace_dsn: Some("https://tok@api.uptrace.dev".into()),
..raw()
},
generic("https://api.uptrace.dev"),
)
.unwrap_err();
assert!(err.to_string().contains("scheme"));
assert!(err.to_string().contains("removed"), "{err}");
}
#[test]