Add default metrics to CloudWatch agent

Report on memory and disk usage

Author: ouranos

packer/linux/conf/cloudwatch-agent/config.json

@@ -2,6 +2,29 @@
 	"agent": {
 		"run_as_user": "root"
 	},
+	"metrics": {
+		"metrics_collected": {
+			"mem": {
+				"measurement": [
+					"mem_used_percent"
+				]
+			},
+			"disk": {
+				"measurement": [
+					"used_percent"
+				],
+				"resources": [
+					"*"
+				]
+			}
+		},
+		"append_dimensions": {
+			"ImageId": "${aws:ImageId}",
+			"InstanceId": "${aws:InstanceId}",
+			"InstanceType": "${aws:InstanceType}",
+			"AutoScalingGroupName": "${aws:AutoScalingGroupName}"
+		}
+	},
 	"logs": {
 		"logs_collected": {
 			"files": {