While trying to work with few of the Cloudwatch metrics for Application load balancer , i could see few of the metrics defined in the AWS documentation, aren't available in the AWS console. ClientTLSNegotiationErrorCount , DroppedInvalidHeaderRequestCount , HTTP_Redirect_Count and RejectedConnectionCount being a few of them .
Is it something to do with the region as am using frankfurt or is it a documentation error.
They are all there if you keep in mind that:
If there are no requests flowing through the load balancer or no data for a metric, the metric is not reported.
For example:
You can even find some of them, if they have been reported, in the CloudWatch Console.