Unified service tagging for AWS Lambda

content/en/getting_started/tagging/unified_service_tagging.md

@@ -363,6 +363,59 @@ to configure the `service` tag only in the configuration of the process check.
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+### Serverless environment
+
+#### AWS Lambda Functions 
+
+Depending on how you build and deploy your AWS Lambda-based serverless applications, you may have several options available for applying the `env`, `service` and `version` tags to the metrics, traces and logs emitted from Lambda functions. 
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+{{% tab "Serverless Framework" %}}
+
+Tag your Lambda functions using the [tags][1] option:
+
+```yaml
+# serverless.yml
+service: service-name
+provider:
+  name: aws
+  # to apply the tags to all functions
+  tags:
+    env: "<ENV>"
+    service: "<SERVICE>"
+    version: "<VERSION>"
+
+functions:
+  hello:
+    # this function will inherit the service level tags config above
+    handler: handler.hello
+  world:
+    # this function will overwrite the tags
+    handler: handler.users
+    tags:
+      env: "<ENV>"
+      service: "<SERVICE>"
+      version: "<VERSION>"
+```
+
+If you have installed the [Datadog serverless plugin][2], the plugin automatically tag the Lambda functions with the `service` and `env` tags using the `service` and `stage` values from the serverless application definition, unless a `service` or `env` tag already exists.
+
+[1]: https://www.serverless.com/framework/docs/providers/aws/guide/functions#tags
+[2]: https://docs.datadoghq.com/serverless/serverless_integrations/plugin
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 ## Further Reading
 
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