fix(telemetry): post browser events to TELEMETRY_ENDPOINT as-is and document routing per side

Author: waleedlatif1

apps/docs/content/docs/platform/self-hosting/environment-variables.mdx

@@ -298,7 +298,7 @@ helm template sim oci://ghcr.io/simstudioai/charts/sim --version 1.11.8 -f value
 | `OTEL_TRACES_SAMPLER_ARG` | Trace sampling ratio |
 | `OTEL_DEPLOYMENT_ENVIRONMENT` | Environment label on emitted spans |
 | `TELEMETRY_SAMPLING_RATIO` | Application-level sampling ratio |
-| `TELEMETRY_ENDPOINT` | Where anonymous telemetry is sent when `OTEL_EXPORTER_OTLP_ENDPOINT` is unset. Defaults to `https://telemetry.simstudio.ai/v1/traces`, which receives traces only; logs and metrics are exported only to a collector you configure. `NEXT_TELEMETRY_DISABLED=1` (the Docker and Helm default) turns all of it off |
+| `TELEMETRY_ENDPOINT` | Full URL browser telemetry events are posted to, as-is (they never carry `OTEL_EXPORTER_OTLP_HEADERS`). Server traces use it only when `OTEL_EXPORTER_OTLP_ENDPOINT` is unset. Defaults to `https://telemetry.simstudio.ai/v1/traces`, which receives traces only: server logs and metrics are exported only to a collector you configure. `NEXT_TELEMETRY_DISABLED=1` (the Docker and Helm default) turns all of it off |
 | `NEXT_TELEMETRY_DISABLED` | Set to `1` to disable anonymous telemetry entirely |
 | `GRAFANA_OTLP_ENDPOINT` / `GRAFANA_OTLP_HEADERS` / `GRAFANA_DEPLOYMENT_ENVIRONMENT` | Grafana Cloud OTLP export |
 

apps/sim/app/api/telemetry/route.ts

@@ -65,9 +65,9 @@ async function forwardToCollector(data: Record<string, unknown>): Promise<boolea
   }
   if (isTelemetryDisabled()) return false
 
-  const endpoint = normalizeOtlpTracesUrl(
-    process.env.TELEMETRY_ENDPOINT || telemetryConfig.endpoint
-  )
+  // TELEMETRY_ENDPOINT has always been the relay's full destination URL, so it is posted to as-is.
+  const endpoint =
+    process.env.TELEMETRY_ENDPOINT || normalizeOtlpTracesUrl(telemetryConfig.endpoint)
   const timeout = DEFAULT_TIMEOUT
 
   try {