Fix subzone link not found

[hanxiaop]

In link https://istio.io/latest/docs/tasks/traffic-management/locality-load-balancing/, the topology.istio.io/subzone link does not exist.

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[Arhell]

lgtm
cc @craigbox

[craigbox]

@ericvn thoughts on if this should be tied to master? Either it goes stale if the file changes, or we use a release-1.12 link and it goes stale as versions increase.

[hanxiaop]

@craigbox I had the same doubt at the beginning. Before using the master version, I was tried to use the permalink. I agree that both of the implementations have their own flaws, and we may discuss which one is more preferred.

[ericvn]

Can we just use something like github_blob which takes into account the currently built branch? Since this is in api, we could create another shortcode that use the api repo. It doesn't help if the line number changes in the file across releases.

[craigbox]

I told you @ericvn would know 🙂

[craigbox]

@hanxiaop would love to see this moved forward, so have marked it to be open.

[hanxiaop]

@ericvn How about other links using https://github.com/istio/api/blob? After I added the lint check for github_api_blob, I realized there are lots of places using the api link right now, and some of the links will be invalid as well if I replace them with the github_api_blob form. Should they keep the original permalink form or should we do something?

[istio-testing]

@hanxiaop: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
lint_istio.io	d360ec3	link	true	/test lint_istio.io
doc.test.profile_default_istio.io	d360ec3	link	true	/test doc.test.profile_default

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[ericvn]

Replaced by #13242.

[hanxiaop]

Replaced by #13242.

@ericvn nice work, thanks!