WiP: detect downstream first in tcp stream

[lambdai]

Signed-off-by: Yuchen Dai [email protected]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:

[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

[mandarjog]

@bianpengyuan @douglas-reid we want to know how many users use server first protocol. How do we collecting info? We may not need to in perpetuity.

[bianpengyuan]

Through TCP log labels?

[lambdai]

Through TCP log labels?

@bianpengyuan @douglas-reid Can you take over the rest? It's unclear to me how we'd like to export the metric. TBH I don't have the context if the detection code is expected to live in SD wasm filter.

[mandarjog]

@kyessenov can you look at this, possible take it over?

[kyessenov]

We technically already record that (connection open with sent > 0 and received = 0). But it needs to hit the timer at the right time.

[zirain]

outdated