Add tests/e2e/router/test_redis_timeout_e2e.py against a proxy booted from
tests/e2e/gateway/redis_timeout_ci_config.yml: a real Redis with socket_timeout 0.001, so every
command times out and the circuit breaker opens, plus a primary deployment that always fails and
falls back to a healthy one, so every request carries retry breadcrumbs into cost tracking. The
test drives twenty chat requests through the proxy and asserts each answers within ten seconds,
the last third is no slower than the first, /health/liveliness stays fast, and every request
still reaches the spend log.
Gate it behind the redis_timeout marker and E2E_REDIS_TIMEOUT, exclude it from the per-PR
e2e-changed selector, register the reliability.circuit_breaker.redis_timeout.stays_responsive
cell, and run it as its own job in the weekly load anomaly workflow with a Postgres and Valkey
service. Against a v1.100.0 proxy the run wedges the worker: requests time out and liveliness
stops answering (LIT-6780).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014ZDULyJPp17ZFiJenRxs2T
379b391ef7