net 2898, graceful_startup

[trevorLeonHC]

Adding graceful_startup endpoint and function that will be called by dataplane postStart hook. Graceful_startup will block all other containers from starting up until envoy dataplane is determined to be ready.

[t-eckert]

@trevorLeonHC, you'll need to add a file 239.txt to the .changelog folder following the existing conventions. Give it a shot and I'll add notes if there are any changes you need to make.

https://github.com/hashicorp/consul-dataplane/tree/main/.changelog

[t-eckert]

You have a few unit tests to clean up. Because the /graceful_startup is now set as a default configuration. The configuration tests that are looking at the default values are failing because they expect "" and are getting "/graceful_startup".

[curtbushko]

Thanks! This is looking pretty great! I have a few requests but I am not too sure about the loop thing.

[t-eckert]

Left a few non-blocking comments. Great work on getting code into production!

[curtbushko]

I think you covered everything I suggested. Good job!

[zalimeni]

Removing backport labels for clarity as this feature was not backported (exists in 1.3.x+)