Add aws ec2 api metrics for cloudwatch

pkg/tsdb/cloudwatch/metric_find_query.go

@@ -55,6 +55,7 @@ func init() {
 		"AWS/DynamoDB":       {"ConditionalCheckFailedRequests", "ConsumedReadCapacityUnits", "ConsumedWriteCapacityUnits", "OnlineIndexConsumedWriteCapacity", "OnlineIndexPercentageProgress", "OnlineIndexThrottleEvents", "ProvisionedReadCapacityUnits", "ProvisionedWriteCapacityUnits", "ReadThrottleEvents", "ReturnedBytes", "ReturnedItemCount", "ReturnedRecordsCount", "SuccessfulRequestLatency", "SystemErrors", "TimeToLiveDeletedItemCount", "ThrottledRequests", "UserErrors", "WriteThrottleEvents"},
 		"AWS/EBS":            {"VolumeReadBytes", "VolumeWriteBytes", "VolumeReadOps", "VolumeWriteOps", "VolumeTotalReadTime", "VolumeTotalWriteTime", "VolumeIdleTime", "VolumeQueueLength", "VolumeThroughputPercentage", "VolumeConsumedReadWriteOps", "BurstBalance"},
 		"AWS/EC2":            {"CPUCreditUsage", "CPUCreditBalance", "CPUUtilization", "DiskReadOps", "DiskWriteOps", "DiskReadBytes", "DiskWriteBytes", "NetworkIn", "NetworkOut", "NetworkPacketsIn", "NetworkPacketsOut", "StatusCheckFailed", "StatusCheckFailed_Instance", "StatusCheckFailed_System"},
+		"AWS/EC2/API":        {"ClientErrors","RequestLimitExceeded","ServerErrors","SuccessfulCalls"},
 		"AWS/EC2Spot":        {"AvailableInstancePoolsCount", "BidsSubmittedForCapacity", "EligibleInstancePoolCount", "FulfilledCapacity", "MaxPercentCapacityAllocation", "PendingCapacity", "PercentCapacityAllocation", "TargetCapacity", "TerminatingCapacity"},
 		"AWS/ECS":            {"CPUReservation", "MemoryReservation", "CPUUtilization", "MemoryUtilization"},
 		"AWS/EFS":            {"BurstCreditBalance", "ClientConnections", "DataReadIOBytes", "DataWriteIOBytes", "MetadataIOBytes", "TotalIOBytes", "PermittedThroughput", "PercentIOLimit"},
@@ -133,6 +134,7 @@ func init() {
 		"AWS/DynamoDB":         {"TableName", "GlobalSecondaryIndexName", "Operation", "StreamLabel"},
 		"AWS/EBS":              {"VolumeId"},
 		"AWS/EC2":              {"AutoScalingGroupName", "ImageId", "InstanceId", "InstanceType"},
+		"AWS/EC2/API":          {},
 		"AWS/EC2Spot":          {"AvailabilityZone", "FleetRequestId", "InstanceType"},
 		"AWS/ECS":              {"ClusterName", "ServiceName"},
 		"AWS/EFS":              {"FileSystemId"},