fix(otel): address staging pr comments for trigger otel (#4586)

Author: TheodoreSpeaks

apps/sim/instrumentation-node.ts

@@ -14,6 +14,7 @@ import type {
 import { createLogger } from '@sim/logger'
 import { TraceAttr } from '@/lib/copilot/generated/trace-attributes-v1'
 import { env } from './lib/core/config/env'
+import { parseOtlpHeaders } from './lib/monitoring/otlp'
 
 diag.setLogger(new DiagConsoleLogger(), DiagLogLevel.ERROR)
 
@@ -47,29 +48,6 @@ function isBusinessSpan(spanName: string): boolean {
   return ALLOWED_SPAN_PREFIXES.some((prefix) => spanName.startsWith(prefix))
 }
 
-// Parse `OTEL_EXPORTER_OTLP_HEADERS`: `key1=value1,key2=value2`
-// (URL-encoded values, whitespace tolerated).
-function parseOtlpHeadersEnv(raw: string): Record<string, string> {
-  const out: Record<string, string> = {}
-  if (!raw) return out
-  for (const part of raw.split(',')) {
-    const trimmed = part.trim()
-    if (!trimmed) continue
-    const eq = trimmed.indexOf('=')
-    if (eq <= 0) continue
-    const key = trimmed.slice(0, eq).trim()
-    const rawVal = trimmed.slice(eq + 1).trim()
-    let val = rawVal
-    try {
-      val = decodeURIComponent(rawVal)
-    } catch {
-      // value wasn't URL-encoded; keep as-is.
-    }
-    if (key) out[key] = val
-  }
-  return out
-}
-
 // Append `/v1/traces` to the OTLP base URL unless already present.
 // The HTTP exporter doesn't auto-suffix the signal path even though
 // the spec says the env var is a base URL.
@@ -214,7 +192,7 @@ async function initializeOpenTelemetry() {
       },
     })
 
-    const otlpHeaders = parseOtlpHeadersEnv(process.env.OTEL_EXPORTER_OTLP_HEADERS || '')
+    const otlpHeaders = parseOtlpHeaders(process.env.OTEL_EXPORTER_OTLP_HEADERS || '')
     const exporterUrl = normalizeOtlpTracesUrl(telemetryConfig.endpoint)
 
     const exporter = new OTLPTraceExporter({

apps/sim/lib/monitoring/otlp.ts

@@ -0,0 +1,27 @@
+/**
+ * Parse OTLP headers per the OTEL spec format `key1=value1,key2=value2`.
+ * Values are URL-decoded; the raw value is preserved if decoding fails.
+ * Keys and values are trimmed; empty or malformed entries are skipped.
+ * @see https://opentelemetry.io/docs/specs/otel/protocol/exporter/
+ */
+export function parseOtlpHeaders(raw: string): Record<string, string> {
+  const out: Record<string, string> = {}
+  if (!raw) return out
+  for (const part of raw.split(',')) {
+    const trimmed = part.trim()
+    if (!trimmed) continue
+    const eq = trimmed.indexOf('=')
+    if (eq <= 0) continue
+    const key = trimmed.slice(0, eq).trim()
+    if (!key) continue
+    const rawVal = trimmed.slice(eq + 1).trim()
+    let val = rawVal
+    try {
+      val = decodeURIComponent(rawVal)
+    } catch {
+      // value wasn't URL-encoded; keep as-is.
+    }
+    out[key] = val
+  }
+  return out
+}

apps/sim/trigger.config.ts

@@ -5,6 +5,7 @@ import { resourceFromAttributes } from '@opentelemetry/resources'
 import { additionalFiles, additionalPackages } from '@trigger.dev/build/extensions/core'
 import { defineConfig } from '@trigger.dev/sdk'
 import { env } from './lib/core/config/env'
+import { parseOtlpHeaders } from './lib/monitoring/otlp'
 
 const grafanaEndpoint = env.GRAFANA_OTLP_ENDPOINT
 const grafanaHeaders = env.GRAFANA_OTLP_HEADERS
@@ -20,24 +21,6 @@ if (grafanaConfigured && !grafanaFullyConfigured) {
   )
 }
 
-/**
- * Parse OTLP headers per the OTEL spec format `key1=value1,key2=value2`.
- * Values are URL-decoded; keys/values are trimmed; empty entries are skipped.
- * @see https://opentelemetry.io/docs/specs/otel/protocol/exporter/
- */
-function parseOtlpHeaders(raw: string): Record<string, string> {
-  const out: Record<string, string> = {}
-  for (const pair of raw.split(',')) {
-    const eq = pair.indexOf('=')
-    if (eq === -1) continue
-    const key = pair.slice(0, eq).trim()
-    const value = pair.slice(eq + 1).trim()
-    if (!key) continue
-    out[key] = decodeURIComponent(value)
-  }
-  return out
-}
-
 const grafanaTelemetry = grafanaFullyConfigured
   ? (() => {
       const baseUrl = grafanaEndpoint!.replace(/\/+$/, '')