fix: make connectionString optional

env/server.ts

@@ -9,7 +9,7 @@ export const env = createEnv({
    */
   isServer: typeof window === "undefined" || "Deno" in window,
   server: {
-    APPLICATION_INSIGHTS_CONNECTION_STRING: z.string(),
+    APPLICATION_INSIGHTS_CONNECTION_STRING: z.string().optional(),
     ADOBE_SCRIPT_SRC: z.string().optional(),
     ADOBE_SDK_SCRIPT_SRC: z.string().optional(),
     API_BASEURL: z.string(),

instrumentation.ts

@@ -1,7 +1,10 @@
 import { env } from "./env/server"
 
 export async function register() {
-  if (process.env.NEXT_RUNTIME === "nodejs") {
+  if (
+    process.env.NEXT_RUNTIME === "nodejs" &&
+    env.APPLICATION_INSIGHTS_CONNECTION_STRING
+  ) {
     const { AzureMonitorTraceExporter } = await import(
       "@azure/monitor-opentelemetry-exporter"
     )