wasm: remove unused Istio specific Wasm code under src.

[mathetake]

Combined with #3404, this PR removes unused Istio specific Wasm extension code under src. Necessary change per envoyproxy/envoy#17268.

Signed-off-by: Takeshi Yoneda takeshi@tetrate.io

[istio-testing]

Hi @mathetake. Thanks for your PR.

I'm waiting for a istio member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Details

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[bianpengyuan]

/ok-to-test

[mathetake]

OK I found that the IstioExtension class calls registerPrometheusNamespace("istio"); in its constructor so we have to do it somewhere. This is related to envoyproxy/envoy#14920 istio/istio#27635 and maybe we should support that via foregin functions.

[mathetake]

so for now, leave the namespace registration as-is, will come back to this after I fixed envoyproxy/envoy#14920

[mathetake]

/retest

[mathetake]

fyi: created a patch envoyproxy/envoy#17357 to allow plugins to register namespaces