What is the actual difference between HTTPCode_ELB_4XX_Count and HTTPCode_Target_4XX_Count?
Could understand that HTTPCode_ELB_4XX_Count is based on http code returned by ELB and HTTPCode_Target_4XX_Count is based on http code returned by target. Still not able to understand how to analyze and troubleshoot the count for each metrics?
Is this count depended on health check failure?
Based on the doc: https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html
The answer above seems wrong, should be:
These are 2 metrics used to help diagnose where the fault lies for ay 4XX errors.
HTTPCode_ELB_4XX_Count - This is simply a 4XX error returned from the application servers.HTTPCode_Target_4XX_Count - This is the number of 4XX errors that are returned from the ELB.To get a gauge of what can trigger this take a look at this page for a list of HTTP statuses mapped to the cause of the ELB error.