add quota to endpoint status response

[tjungblu]

This adds the configured backend quota bytes to the endpoint status response. related discussion in #17872

[tjungblu]

seems the robustness is failing on cert issues from alexellis/arkade#1056

[alexellis]

If the test is failing, could it be due to trying to download vmmeter or something else via arkade?

The arkade-get action can be used instead of curl | sh..

[ahrtr]

Overall looks good to me. The change is clear and straightforward!

Thanks @tjungblu

[ahrtr]

Link to #17872

[alexellis]

From (uses curl/sh and the utility domain)

- uses: alexellis/setup-arkade@master

=>

To (Downloads directly from GitHub's releases page)

      - uses: alexellis/arkade-get@master
        with:
           vmmeter: latest

[fuweid]

LGTM

[ahrtr]

We also need to change the client side, including etcdctl. It can be in a separate PR.

[tjungblu]

I think Scott had this in #17871

Shall we also backport this?

[ahrtr]

Shall we also backport this?

Usually we don't backport new feature, but I am not against it if other members/contributors agree to backport it.

We need to ensure it doesn't break any existing client, for example an application which depends on the old etcd client SDK can still work with a new etcdserver.

[tjungblu]

it is not critical for us to have in 3.5, but it's also not a big and invasive change.

for example an application which depends on the old etcd client SDK can still work with a new etcdserver.

Wouldn't protobuf just flag this as an unknown field?

[ahrtr]

Wouldn't protobuf just flag this as an unknown field?

For this PR, it's safe. My point is that we don't have such mix-version test cases,

• new client SDK version vs old etcdserver
• old client SDK version vs new etcdserver

It can be discussed separately.

[ahrtr]

cc @fuweid @jmhbnz @serathius

[jmhbnz]

LGTM - Thanks @tjungblu

[ahrtr]

@tjungblu Please update 3.6 changelog for now. thx. If we decide to backport the PR to 3.5 later, we can update the changelog for 3.5 (revert the changelog for 3.6) by then.