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feat(server): gate OTLP export behind telemetry opt-in #602

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feat(server): gate OTLP export behind telemetry opt-in #602

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3 changes: 3 additions & 0 deletions crates/switchyard-server/README.md
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Expand Up @@ -171,6 +171,9 @@ containing `opus`, `sonnet`, then `haiku`. Other ties preserve the route's targe
## Metrics

`GET /metrics` exposes Prometheus text from the server's process-wide OpenTelemetry provider.
Outbound OTLP export is disabled unless `SWITCHYARD_TELEMETRY` is explicitly enabled with a truthy
value such as `1` or `true`; configuring `OTEL_EXPORTER_OTLP_*` alone is not treated as telemetry
opt-in. The local `/metrics` endpoint remains available either way.
Routed-call compatibility metrics are:

| Metric | Type | Labels | Meaning |
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4 changes: 4 additions & 0 deletions crates/switchyard-server/src/observability.rs
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Expand Up @@ -21,6 +21,7 @@ use crate::{ServerError, ServerResult, metrics};

const DEFAULT_LOG_FILTER: &str = "info,opentelemetry=warn";
const DEFAULT_SERVICE_NAME: &str = "switchyard-server";
const SWITCHYARD_TELEMETRY_ENV: &str = "SWITCHYARD_TELEMETRY";

struct Observability {
tracer_provider: Option<SdkTracerProvider>,
Expand Down Expand Up @@ -76,6 +77,9 @@ pub(crate) fn otlp_enabled(signal: &str) -> bool {
if env_var_is_true("OTEL_SDK_DISABLED") {
return false;
}
if !env_var_is_true(SWITCHYARD_TELEMETRY_ENV) {
return false;
}

@grahamking grahamking Sep 2, 2026

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Do we need both env vars?

if env::var(format!("OTEL_{signal}_EXPORTER"))
.ok()
.filter(|value| !value.trim().is_empty())
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