Cherry-pick branch 'wlstdocupdate' into 'release/4.1'

Author: rjeberhard

documentation/site/content/managing-domains/accessing-the-domain/wlst.md

@@ -25,6 +25,26 @@ You can use the `kubectl exec` command to start an interactive WLST session
 within a pod or to remotely run a WLST script on a pod.
 Typically, this is the preferred method.
 
+**NOTE**: The WLST script uses the value of the environment variable `USER_MEM_ARGS` to control the heap settings of the JVM process.  If you have set the environment variable 
+`USER_MEM_ARGS` in the domain resource YAML, the WLST process will inherit the memory settings.  For example,
+if you have `USER_MEM_ARGS` value set to `-Xms2048m -Xmx2048m`, the WebLogic server JAVA process will use this heap settings, and if you run the WLST script in the server pod,
+the WLST script JAVA process will also use this heap settings. This may cause unexpected behavior in the server pod due to additional memory usage.  
+
+In order to change the memory settings, you must do the following 
+
+
+```shell
+USER_MEM_ARGS="" $ORACLE_HOME/oracle_common/common/bin/wlst.sh
+```
+This will unset the `USER_MEM_ARGS` and let the WLST to use the default heap size `-Xms32m -Xmx1024m`, and this only affect the WLST script process.  
+
+If you want to use different memory settings, you can adjust it by 
+
+```shell
+USER_MEM_ARGS="-Xms128m -Xmx128m" $ORACLE_HOME/oracle_common/common/bin/wlst.sh
+```
+
+
 For example, if a `domainUID` is `sample-domain1`,
 its Administration Server is named `admin-server` and is configured with default port `7001`,
 and its pods are running in namespace `sample-domain1-ns`,
@@ -34,7 +54,7 @@ then you can start an interactive WLST session this way:
 
 $ kubectl -n sample-domain1-ns exec -it sample-domain1-admin-server /bin/bash
 
-[oracle@sample-domain1-admin-server oracle]$ wlst.sh
+[oracle@sample-domain1-admin-server oracle]$ USER_MEM_ARGS="" $ORACLE_HOME/oracle_common/common/bin/wlst.sh
 
 Initializing WebLogic Scripting Tool (WLST) ...
 

documentation/site/content/managing-domains/domain-on-pv/overview.md

@@ -26,6 +26,11 @@ The `initializeDomainOnPv` section:
 - Creates the RCU schema, if needed.
 - Creates the WebLogic domain home on the persistent volume based on the provided WDT models.
 
+{{% notice note %}}
+If you are running WebLogic Scripting Tool (WLST) inside a server pod, then
+please refer to [Use kubectl exec]({{< relref "/managing-domains/accessing-the-domain/wlst#use-kubectl-exec">}}) in the WLST documentation for very important information related to memory usage.
+{{% /notice %}}
+
 ### High-level use case
 
 The typical Domain on PV use case is for an application life cycle that requires persisting changes to the permanent file system.