docs: add opencensusagent docs

[brianwolfe]

[ ] Configuration Infrastructure [ ] Docs [ ] Installation [ ] Networking [ ] Performance and Scalability [X] Policies and Telemetry [ ] Security [ ] Test and Release [ ] User Experience [ ] Developer Infrastructure

Still WIP. Trying to get the time to finish this up, but pushing it so I can start to execute tests.

Fixes https://github.com/istio/istio.io/issues/8166

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[istio-testing]

Skipping CI for Draft Pull Request. If you want CI signal for your change, please convert it to an actual PR. You can still manually trigger a test run with /test all

[craigbox]

Any update on this PR, Brian?

[brianwolfe]

@craigbox Thanks for the ping. I haven’t had time for a few weeks. I can try to make some progress this weekend.

[PatrikSteuer]

This content is really helpful, thanks a lot!

[tillig]

It would be awesome to see this get merged. I spent a lot of time digging around in forums and chats to find that I was missing the global.proxy.tracer setting. This doc would have saved me a ton of time.

[craigbox]

/cc @brianwolfe to see if he's made any more progress. Could this go in as-is?

[verysonglaa]

Hi all, I am in the process of creating a new updated PR based on this code. It should be ready in a few days.

[istio-testing]

@brianwolfe: PR needs rebase.

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[istio-testing]

@brianwolfe: 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
doc.test.profile_default_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile_default
doc.test.multicluster_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.multicluster
doc.test.profile_demo_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile_demo
doc.test.profile_none_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile_none
doc.test.profile_minimal_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile_minimal
doc.test.profile-default_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile-default
doc.test.profile-minimal_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile-minimal
doc.test.profile-demo_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile-demo
doc.test.profile-none_istio.io	6632f2a7b79d76fcfd88f890cc1e68cdcc1bf964	link	true	/test doc.test.profile-none

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