Add CloudWatch integration documentation to the reference.

Fixes gh-402

Author: maciejwalkowiak

docs/src/main/asciidoc/spring-cloud-aws.adoc

@@ -2334,6 +2334,41 @@ public class SimpleResourceLoadingBean {
 	}
 }
 ----
+== CloudWatch Metrics
+Spring Cloud AWS provides Spring Boot auto-configuration for Micrometer CloudWatch integration.
+To send metrics to CloudWatch add a dependency to `spring-cloud-aws-actuator` module:
+
+[source,xml,indent=0]
+----
+<dependency>
+	<groupId>org.springframework.cloud</groupId>
+	<artifactId>spring-cloud-aws-actuator</artifactId>
+</dependency>
+----
+
+Additionally CloudWatch integration requires a value provided for `management.metrics.export.cloudwatch.namespace` configuration property.
+
+Following configuration properties are available to configure CloudWatch integration:
+
+[cols="3*", options="header"]
+|===
+|property
+|default
+|description
+
+|management.metrics.export.cloudwatch.namespace
+|
+|The namespace which will be used when sending metrics to CloudWatch. This property is needed and must not be null.
+
+|management.metrics.export.cloudwatch.enabled
+|true
+|If CloudWatch integration should be enabled. This property should be likely set to `false` for a local development profile.
+
+|management.metrics.export.cloudwatch.step
+|1m
+|The interval at which metrics are sent to CloudWatch. The default is 1 minute.
+|===
+
 == Configuration properties
 
 To see the list of all Spring Cloud AWS related configuration properties please check link:appendix.html[the Appendix page].