SQL2017 query_post_execution_plan_profile overhead

following QFE 13515392.
Based on Jayc input : "On SQL17 however, lightweight profiling is OFF by default and query_post_execution_plan_profile depends on lightweight profile.
When you turn on/off this XEvent, the server will turn on/off lightweight profiling.   Every time you change lightweight profiling, the server needs to invalidate the execution plan cache.  So it is really bad idea to change this status frequently.  This is what the customer is doing every couple of minutes.  It would be better to turn lightweight profiling ON with TF7412."

Author: Guillaume-Fourrat

docs/relational-databases/performance/query-profiling-infrastructure.md

@@ -190,6 +190,9 @@ For more information on the performance overhead of query profiling, see the blo
 > [!NOTE]
 > Extended Events that leverage lightweight profiling will use information from standard profiling in case the standard profiling infrastructure is already enabled. For example, an extended event session using `query_post_execution_showplan` is running, and another session using `query_post_execution_plan_profile` is started. The second session will still use information from standard profiling.
 
+> [!NOTE]
+> On [!INCLUDE[ssSQL17](../../includes/sssql17-md.md)], Lightweight Profiling is off by default but is activated when an XEvent trace relying on `query_post_execution_plan_profile` is started, and is then deactivated again when the trace is stopped. As a consequence, if Xevent traces based on `query_post_execution_plan_profile` are frequently started and stopped on a [!INCLUDE[ssSQL17](../../includes/sssql17-md.md)] instance, it is strongly advised to activate Lightweight Profiling at global level with traceflag 7412 to avoid the repeated activation/deactivation overhead. 
+
 ## See Also  
  [Monitor and Tune for Performance](../../relational-databases/performance/monitor-and-tune-for-performance.md)     
  [Performance Monitoring and Tuning Tools](../../relational-databases/performance/performance-monitoring-and-tuning-tools.md)