Adding X-Ray Tracing support

Author: sanathkr

versions/2016-10-31.md

@@ -74,6 +74,7 @@ Environment | [Function environment object](#environment-object) | Configuration
 VpcConfig | [VPC config object](http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-function-vpcconfig.html) | Configuration to enable this function to access private resources within your VPC.
 Events | Map of `string` to [Event source object](#event-source-object) | A map (string to [Event source object](#event-source-object)) that defines the events that trigger this function. Keys are limited to alphanumeric characters.
 Tags | Map of `string` to `string` | A map (string to string) that specifies the tags to be added to this function. Keys and values are limited to alphanumeric characters. Keys can be 1 to 127 Unicode characters in length and cannot be prefixed with `aws:`. Values can be 1 to 255 Unicode characters in length. When the stack is created, SAM will automatically add a `lambda:createdBy:SAM` tag to this Lambda function.
+Tracing | `string` | String that specifies the function's [X-Ray tracing mode](http://docs.aws.amazon.com/lambda/latest/dg/lambda-x-ray.html). Accepted values are `Active` and `PassThrough`
 
 ##### Return values