As documented in https://www.envoyproxy.io/docs/envoy/latest/configuration/best_practices/level_two, @alyssawilk and I have discussed forcing the user to specify an HCM configuration option that specifies how to handle stream errors, thus guiding users into selecting the correct option for their use case. I think the best way of doing this is:

1. Add a new option to configure this setting using a bool WKT, deprecate the old option, and explicitly warn/stat if the new option is not set at all, telling the user that in a future version this setting will be required.
2. In the normal "deprecation cycle" make the new setting required.