Expand first: retain the old fields, constraints and readable write format. Check both versions’ reads and writes, including old code reading rows written by green, permissions, RPC contracts, queues and duplicate effects. Adding a schema alone does not establish compatibility.

Use a reviewed backfill and reconciliation plan where needed. Remove the old contract only in a later change, after the rollback window closes and old applications and workers have drained. Traffic rollback cannot restore database state.

The example requires at least 1,000 requests per version and 5 minutes per measured stage. Error and latency uncertainty can hold a stage. These illustrative thresholds need validation against the service’s real traffic and objectives.

Route new requests to ready instances with available capacity. Keep shared database and worker limits in the decision, stop new assignments before draining an instance, and return an explicit retry response when the accepted backlog is full.

Group compatible background work only within item, byte and waiting-time limits. Keep a result for every item and keep interactive requests responsive. Account fairness, actual service capacity and provider batching need their own measurements.

Bounded traffic and worker batches checked in isolated CI. Nine accepted HTTP requests settled across five worker messages: eight reads succeeded and one malformed request returned its own error. Two overload or closed-admission requests received an explicit retry response. A partial batch flushed at its waiting-time limit.

Readiness exclusion, handler limits, draining before switch-back and process, HTTP and database cleanup passed. This summary retains 1 reviewed traffic execution. It covers one account and one writer implementation, with IPC between the coordinator and workers.

HTTP routing and controlled account turns checked in isolated CI. The later review verified the configured check against two HTTP backends using one writer implementation. Across 3 controlled accounts, all 12 accepted requests settled; 3 refused requests returned an explicit retry response.

Background work retained its capacity reservation after the HTTP 202 response, completed its saved result and passed a fresh read. Readiness exclusion and restoration, request timeout handling, draining and switch-back also passed. The run recorded 1 explicit read retry and 0 implicit retries, then removed its fixture rows.

This is one reviewed isolated HTTP execution. It measures neither production capacity nor broad account fairness. The real host router, live authentication and database behavior, different application releases and external provider effects remain unverified.

Grouping worker messages does not establish provider or inference batching. A live load balancer, backend readiness probes and traffic limits still need verification through the existing deployment owners.

Playwright CLI checked against a controlled browser fixture. One reviewed isolated session exercised local planning, preserved an HTTP error, reported an unavailable companion and checked a controlled download and screenshot. Its browser session and owned test processes were cleaned up.

The fixture checks the selected interaction contracts. It does not establish the full Next application, an installed extension or companion, image understanding, generated application code or a native aperture.

Actual Bridge page check configured. A separate browser check targets the built Next application and its Bridge page with controlled HTTP responses. Its fresh CI result has not been admitted to this summary. The earlier controlled-fixture result remains separate; neither check grants provider access or release approval.

Browser checks can validate a build or expose a broken handoff. Image understanding, application code generation, installed companion behavior and native rendering each need their own working path and evidence.

Capture change size, dependency and workflow changes, and earlier workflow history before the decision. Preserve missing values. Keep the eventual result, later logs, duration and raw identities out of the predictors.

A tested feature contract rejects unexpected fields and future observation times. It checks structure; supplied values and timestamps still need source evidence. A complete vector does not grant training or release authority.

Evaluate chronologically, keep related commits and attempts together, and compare with base-rate and logistic models. Measure missed failures, false alerts and probability calibration. Exclude the frozen deployment benchmark’s source commit groups from model development; the label counts above are not an admitted training set.

Duration estimates need trustworthy timing records. Search or Academy ranking needs query groups and relevance labels. Cacao and festival scenarios need their own observed inputs and outcomes before a predictive model can be assessed.