add support-bundle troubleshooting step

Author: Venkat Yalla

articles/iot-edge/troubleshoot.md

@@ -40,6 +40,28 @@ The types of checks run by the tool can be classified as:
 
 For a complete list of diagnostic checks, see [Built-in troubleshooting functionality](https://github.com/Azure/iotedge/blob/master/doc/troubleshoot-checks.md).
 
+## Gather debug information with iotedge 'support-bundle' command
+
+When you need to gather logs from an IoT Edge device, the most convenient way is to use the `support-bundle` command. By default, this command collects module, `iotedged` and container engine logs, 'iotedge check' JSON output and other useful debug information. It compresses them into a single file for easy sharing. The `support-bundle` command is available in [release 1.0.9](https://github.com/Azure/azure-iotedge/releases/tag/1.0.9) and later.
+
+Run the `support-bundle` command with the `--since` flag to specify how long from the past you want to get logs from. For example `6h` will get logs since the last 6 hours, `6d` since the last 6 days, `6m` since the last 6 minutes and so on. Include the `--help` flag to see a complete list of options.
+
+
+* On Linux:
+
+  ```bash
+  sudo iotedge support-bundle --since 6h
+  ```
+
+* On Windows:
+
+  ```powershell
+  iotedge support-bundle --since 6h
+  ```
+
+> [!WARNING]
+> Output from the `support-bundle` command can contain information such as host, device and module names, information logged by your modules etc. Please be aware of this if sharing the output in a public forum.
+
 ## Standard diagnostic steps
 
 If you encounter an issue, you can learn more about the state of your IoT Edge device by reviewing the container logs and the messages that pass to and from the device. Use the commands and tools in this section to gather information.