README.md in fluent-plugin-cloudwatch-1.2.2 vs README.md in fluent-plugin-cloudwatch-1.2.3

@@ -5,12 +5,12 @@
 ***AWS CloudWatch*** input plugin.  
 
 this plugin is simple.  
 get metrics from cloudwatch.
 
-1. get every 60 seconds from AWS CloudWatch API(sleep 1sec)
-2. 60 seconds of data
+1. get every 300 seconds from AWS CloudWatch API(sleep 1sec)
+2. 300 seconds of data
 
 ## Configuration
 
 ```config
 <source>
@@ -23,12 +23,12 @@
   namespace        [namespace]
   statistics       [statistics] (default: Average)
   metric_name      [metric name]
   dimensions_name  [dimensions_name]
   dimensions_value [dimensions value]
-  period           [period] (default: 60)
-  interval         [interval] (default: 60)
+  period           [period] (default: 300)
+  interval         [interval] (default: 300)
 </source>
 
 ```
 
 ### GET RDS Metric
@@ -145,11 +145,11 @@
   cw_endpoint monitoring.ap-northeast-1.amazonaws.com
 
   namespace AWS/DynamoDB
   metric_name ConsumedReadCapacityUnits,ConsumedWriteCapacityUnits
   dimensions_name TableName
-  dimensions_value ppc-production-visit
+  dimensions_value some_dd_tablename
   statistics Sum 
   interval 300
   period 300
 ```
 
@@ -157,9 +157,36 @@
 
 ```
 
 2013-04-11 15:13:00 +0900       cloudwatch      {"ConsumedReadCapacityUnits":8271.5}
 2013-04-11 15:13:00 +0900       cloudwatch      {"ConsumedWriteCapacityUnits":2765.5}
+
+```
+
+### GET Billing Metirc
+
+Note: Billing requires the us-east-1 endpoint
+```config
+  type cloudwatch
+  tag  cloudwatch aws_key_id  YOUR_AWS_KEY_ID
+  aws_sec_key YOUR_AWS_SECRET/KE
+  cw_endpoint monitoring.us-east-1.amazonaws.com
+
+  namespace AWS/Billing
+  metric_name EstimatedCharges
+  dimensions_name Currency
+  dimensions_value USD
+  statistics Average
+  interval 7200
+  period 21600
+```
+
+#### output data format
+
+```
+
[phone]:03:00 +0900       cloudwatch      {"EstimatedCharges_in_USD":"543.175"}
[phone]:03:00 +0900       cloudwatch      {"EstimatedCharges_in_USD":"550.39"}
 
 ```
 
 ## Contributing