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stef-k merged 1 commit into from
Mar 26, 2026
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Update changelog for v1.2.21 with review fix details #209

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7 changes: 7 additions & 0 deletions CHANGELOG.md
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Expand Up @@ -14,11 +14,18 @@
### Fixed
- **HIGH:** Cold-cache tile loading returned 404 for budget-exhausted tiles — Leaflet treated as permanent failure, showing persistent gray areas. Now returns 503 + `Retry-After` header; client retries automatically (#206)
- **MEDIUM:** Ghost metadata rows stored in DB when tile fetch was aborted by budget exhaustion — rows had `Size=0`, null `ETag`/`ExpiresAtUtc`, pointing to non-existent files (#206)
- **MEDIUM:** Potential blob URL memory leak in `RetryTileLayer` — if a tile was removed (panned/zoomed away) while blob was being read, the revoke callback never fired; now guarded with `signal.aborted` check (#208)
- **LOW:** Client-side retry thundering herd — all 503'd tiles retried at identical intervals; now adds ±25% jitter to backoff delays (#208)
- **LOW:** Zero or negative `Retry-After` header values caused immediate retry; now clamped to base delay floor (#208)
- **LOW:** `CacheTileAsync` upstream failure path relied on downstream null guard; now returns early with explicit intent (#208)

### Changed
- `CacheTileAsync` now returns `bool` (`false` = budget exhaustion) instead of `void` (#206)
- `RetrieveTileAsync` now returns `TileRetrievalResult` instead of `byte[]?` (#206)
- `PerformanceMonitoringMiddleware` log line now includes explicit `RequestId` parameter (#206)
- `BudgetRetryAfterSeconds` constant extracted with doc linking to `OutboundBudget` config (#208)
- `ReadAsByteArrayAsync` and inter-retry `Task.Delay` now pass `CancellationToken` for prompt cancellation (#208)
- `TileCacheServiceTests` and `TilesControllerTests` now share `[Collection("OutboundBudget")]` to prevent parallel test interference (#208)

## [1.2.20] - 2026-03-22

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