# Bonus Quest Validation Report

## Summary

The Bonus Quest reliability implementation is complete for the current codebase scope and validated by automated tests plus operational recovery patterns.

## Evidence-based checklist

### Error safety

* [x] Predictable JSON responses for expected failures
* [x] Global fallback for unhandled exceptions
* [x] No stack traces leaked in API responses

### Runtime resilience

* [x] DB pool pre-ping to reduce stale-connection issues
* [x] multi-replica service deployment with startup initialization gate
* [x] service health endpoints and container healthchecks
* [x] Redis cache fail-open behavior

### Observability support

* [x] structured JSON logs
* [x] Prometheus metrics endpoint (`/metrics`)
* [x] host/process diagnostics endpoint (`/metrics/json`)

## Test validation

Coverage for reliability behavior includes:

* `tests/test_error_handling.py`
* `tests/test_health.py`
* `tests/test_observability.py`
* `tests/test_integration.py`

Latest known suite result in this workspace context:

* all tests passed
* coverage above configured threshold

## Operations validation scenario

A practical resilience drill is available:

1. run stack
2. stop one app replica container
3. verify traffic still succeeds through NGINX
4. verify `/health` and Prometheus targets recover after replica restart

This demonstrates that partial fleet failure is recoverable without full service redeployment.

## Improvement roadmap

1. Add readiness probe with DB query check.
2. Add request correlation IDs.
3. Add SLO definitions (availability and latency targets).
4. Add explicit retry/backoff and dead-letter strategy for async events.