Add note about performance issue pricing

Author: snigdhas

docs/product/performance/index.mdx

@@ -40,6 +40,14 @@ There are several types of [metrics](/product/performance/metrics/) that you can
 
 ## Triage Performance Issues
 
+<Note>
+
+**Issues and Event Quotas**
+
+Your quota is consumed by _events_ or _traces_, not _issues_. Performance issues are generated from your accepted transactions, which **does not** directly impact your quota. Performance transaction events use transactions, which **does** directly impact your quota. Sentry does provide tools, however, to control the type and amount of error and transaction events that are accepted. Learn more in [Quota Management](/pricing/quotas/manage-transaction-quota).
+
+</Note>
+
 If your application is configured for Performance Monitoring, Sentry will detect common performance problems, and group them into issues just like it does with errors. Performance issues help to surface performance problems in your application and provide a workflow for resolving them. Learn more about [performance issues](/product/issues/issue-details/performance-issues/).
 
 ## Learn More