feat(core-shared): OTel resource builder

packages/core-shared/src/instrumentation/otel/resource.ts

@@ -0,0 +1,22 @@
+import { Resource } from "@opentelemetry/resources";
+
+export type BuildResourceOpts = {
+  serviceName: string;
+  serviceVersion?: string;
+  environment: string;
+  namespace?: string;
+};
+
+/**
+ * Builds an OpenTelemetry Resource with semantic-convention attributes.
+ * Each app constructs its own resource at startup (per-app service name).
+ */
+export function buildResource(opts: BuildResourceOpts): Resource {
+  const attrs: Record<string, string> = {
+    "service.name": opts.serviceName,
+    "deployment.environment.name": opts.environment,
+  };
+  if (opts.serviceVersion) attrs["service.version"] = opts.serviceVersion;
+  if (opts.namespace) attrs["service.namespace"] = opts.namespace;
+  return new Resource(attrs);
+}