## Summary
Adds the **4.89.0** load test metrics artifacts, following the existing
`tools/loadtest/metrics/runs/` conventions.
### Baseline — `runs/baseline/489loadtest/`
18h run on a fresh RC instance (no data).
- `489loadtest-2026-07-10-210313Z-18h.json` / `.md`
### Migration — `runs/migration/487to489mig/`
4.87 → 4.89 migration, before vs. after.
- `487to489mig-2026-07-10-162812Z-1h.{json,md}` — pre-migration (1h
window)
- `487to489mig-2026-07-10-192738Z-130m.{json,md}` — post-migration (130m
window)
## Results
| Run | Fleet errors | ALB 5xx | Abnormal stops | Threshold checks |
|-----|:---:|:---:|:---:|---|
| Baseline (18h) | 0 | 0 | 0 | RDS Writer Deadlocks avg 0.13
(occasional, retried) |
| Migration pre (1h) | 0 | 0 | 0 | ✅ all within thresholds |
| Migration post (130m) | 0 | 0 | 0 | RDS Writer Deadlocks avg 0.08
(occasional, retried) |
The only flag is a near-zero average of occasional RDS writer deadlocks
(MySQL retries these); everything else is within expected range and
holds steady across the migration. Full per-metric comparison
(`compare-metrics.sh`) is posted on the release QA issue.
Data only — no code changes.
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **Tests**
* Added baseline and migration load-test performance reports.
* Included infrastructure, database, Redis, load balancer, network,
container health, error, and SQL performance metrics.
* Added reports covering multiple test durations and migration intervals
for improved performance analysis.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Andrey Kizimenko
6430e6132f