HTTP retry events gateway-error include 504 in Virtural Route Retry policy

[clouddev-code]

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Tell us about your request
HTTP retry events gateway-error include 504 in Virtural Route Retry policy .
HTTP code 504 is expected to occur when the requesting API is down. If the requesting API is down and retries, the load on the requesting API will increase, possibly causing a secondary failure.

Which integration(s) is this request for?
ECS Fargate

Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?
I would like to see events other than 504 added from HTTP retry events.

Are you currently working around this issue?
Avoiding the use of HTTP Retry events

Additional context

Attachments

[clouddev-code]

I would like to be able to specify the retriable-status-code.
https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/router_filter