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feat(router): adaptive consistency tier negotiation#1248

Openkwame-okoyewants to merge 3 commits intomainfromfeat/consistency-negotiation
KWKwame Okoyecommented 2d ago

Summary

feat(router): adaptive consistency tier negotiation — addresses the regression surfaced in atlas-edge after the recent feat work landed on main.

Why

  • The previous behavior on main short-circuited the safe path under load; this PR restores the intended contract.
  • Adds a guard so the regression cannot resurface silently in staging.
  • Drive-by: removes dead-code call sites the linter was warning about.

Scope

  • Files touched: 23 across the core module + tests.
  • No public API change; ABI is preserved.
  • CI: all green on the matrix runs.

Labels: feature, performance

KWKwame Okoyecommented 2d ago

Smoke-tested under the load profile from last week's incident. No regressions.

LNLNcommented 2d ago

Nice — pulled this locally and the burn-rate window now lines up with the SLO board. Approving once the snapshot tests catch up.

YUYuki Tanakacommented 2d ago

Could we add a regression test for the partial-bucket case? I'm happy to push it on top if you'd prefer.

NONoor Hassancommented 1d ago

Left a few small nits inline. Otherwise the shape is exactly what we discussed in the design doc.

LNLNcommented 1d ago

Confirmed the contract on the staging cluster — x-quorum is propagated end-to-end. Holding approval until I see the metric in Grafana.

YUYuki Tanakacommented 1d ago

Rebased against main and force-pushed; CI is happy. Re-requesting review.

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