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feat(observability): gate Sentry tracing spans behind SENTRY_TRACING

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Spans are now created and exported to Sentry only when SENTRY_TRACING is enabled (default off), keeping 24/7 operation within the free-tier span quota. Error monitoring stays always-on. Includes OpenSpec change gate-sentry-spans (proposal, design, specs, tasks).

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Mauricio Barragan
2026-07-16 12:54:15 -06:00
co-authored by Cursor
parent f6e8381c20
commit a5c83ee026
11 changed files with 169 additions and 5 deletions
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src/instrumentation/otel.ts
+6 -3
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@@ -2,17 +2,20 @@ import * as Sentry from "@sentry/node";
import { trace, type Span, type Tracer } from "@opentelemetry/api";
import { NodeTracerProvider } from "@opentelemetry/sdk-trace-node";
import { SentrySpanProcessor, SentryPropagator } from "@sentry/opentelemetry";
import { isTracingEnabled } from "./tracing.js";
let tracer: Tracer | null = null;
/**
* OpenTelemetry spans export to Sentry via @sentry/opentelemetry when SENTRY_DSN is set.
* Without a DSN, spans are no-ops (safe for local dev and tests).
* OpenTelemetry spans export to Sentry via @sentry/opentelemetry only when
* SENTRY_DSN is set AND SENTRY_TRACING is enabled. Otherwise spans are no-ops
* (default; safe for 24/7 operation, local dev, and tests). Error capture in
* `withSpan` is preserved regardless.
*/
export function initOpenTelemetry(): Tracer {
if (tracer) return tracer;
if (!process.env.SENTRY_DSN?.trim()) {
if (!process.env.SENTRY_DSN?.trim() || !isTracingEnabled()) {
tracer = trace.getTracer("arbpulse");
return tracer;
}