Add Local Storage for OpenCensus Python SDK

Author: lzchen

articles/azure-monitor/app/data-retention-privacy.md

@@ -172,7 +172,18 @@ By default `%TEMP%/appInsights-node{INSTRUMENTATION KEY}` is used for persisting
 
 The folder prefix `appInsights-node` can be overridden by changing the runtime value of the static variable `Sender.TEMPDIR_PREFIX` found in [Sender.ts](https://github.com/Microsoft/ApplicationInsights-node.js/blob/7a1ecb91da5ea0febf5ceab13d6a4bf01a63933d/Library/Sender.ts#L384).
 
+### OpenCensus Python
 
+By default OpenCensus Python SDK uses the current user folder `%username%/.opencensus/.azure/`. Permissions to access this folder are restricted to the current user and Administrators. (See [implementation](https://github.com/census-instrumentation/opencensus-python/blob/master/contrib/opencensus-ext-azure/opencensus/ext/azure/common/storage.py) here.) The folder with your persisted data will be named after the Python file that generated the telemetry.
+
+You may change the location of your storage file by passing in the `storage_path` parameter in the constructor of the exporter you are using.
+
+```python
+AzureLogHandler(
+  connection_string='InstrumentationKey=00000000-0000-0000-0000-000000000000',
+  storage_path='<your-path-here>',
+)
+```
 
 ## How do I send data to Application Insights using TLS 1.2?