Cloudwatch: Adding support for additional Amazon CloudFront. (#27891) (#28069)

* Cloudwatch: Adding support for additional Amazon CloudFront metrics.

pkg/tsdb/cloudwatch/metric_find_query.go

@@ -52,7 +52,7 @@ var metricsMap = map[string][]string{
 	"AWS/AutoScaling":       {"GroupDesiredCapacity", "GroupInServiceInstances", "GroupMaxSize", "GroupMinSize", "GroupPendingInstances", "GroupStandbyInstances", "GroupTerminatingInstances", "GroupTotalInstances"},
 	"AWS/Billing":           {"EstimatedCharges"},
 	"AWS/Chatbot":           {"EventsThrottled", "EventsProcessed", "MessageDeliverySuccess", "MessageDeliveryFailure", "UnsupportedEvents"},
-	"AWS/CloudFront":        {"4xxErrorRate", "5xxErrorRate", "BytesDownloaded", "BytesUploaded", "Requests", "TotalErrorRate"},
+	"AWS/CloudFront":        {"4xxErrorRate", "5xxErrorRate", "BytesDownloaded", "BytesUploaded", "Requests", "TotalErrorRate", "CacheHitRate", "OriginLatency"},
 	"AWS/CloudHSM":          {"HsmKeysSessionOccupied", "HsmKeysTokenOccupied", "HsmSessionCount", "HsmSslCtxsOccupied", "HsmTemperature", "HsmUnhealthy", "HsmUsersAvailable", "HsmUsersMax", "InterfaceEth2OctetsInput", "InterfaceEth2OctetsOutput"},
 	"AWS/CloudSearch":       {"IndexUtilization", "Partitions", "SearchableDocuments", "SuccessfulRequests"},
 	"AWS/CodeBuild":         {"BuildDuration", "Builds", "DownloadSourceDuration", "Duration", "FailedBuilds", "FinalizingDuration", "InstallDuration", "PostBuildDuration", "PreBuildDuration", "ProvisioningDuration", "QueuedDuration", "SubmittedDuration", "SucceededBuilds", "UploadArtifactsDuration"},