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> Using Bluebox, plan a Flash Sale on featured products.

BLUEBOXlive traffic · shop-api

GET /api/products809 · 262ms

POST /api/cart560 · 772ms · 3× SLOWER

POST /api/checkout50 · 674ms

THE ANSWER

Run the sale on aurora-mug and signal-notebook — the two most-requested items. Keep the change out of POST /api/cart: at 772ms it is already the slowest endpoint — three pool acquisitions per request — so it has the least headroom if volume climbs.
PR #4 feat/flash-sale → main +16−6

- priceCents: product.price_cents,

+ SALE_PRODUCT_IDS.has(product.id)

+ salePriceCents: onSale ? …
INCIDENT DETECTED

POST /api/cartHTTP 500
RESOURCE_CONTENTIONF-4478

database_pool_exhausted96%

3 components affected · GET /api/products · POST /api/cart · POST /api/checkout

96% errors whenever traffic is elevated, ~0% when it is quiet. The Flash Sale added no database calls — the three acquisitions on POST /api/cart were always there.

ROOT CAUSE · server.js:9

const databasePool = [{}, {}];
1.Increase pool size

2.Add wait-for-slot backoff

3.Collapse POST /api/cart's 3 pool acquisitions into 1

shop-api: fixed 2-slot database pool causes ~96% error rate on catalog/cart/checkout under load

issue #1 · bluebox-by-dynatrace

- const databasePool = [{}, {}];

+ Array.from({ length: DB_POOL_SIZE })

+ await acquireSlot(databasePool, 500)

Assign to Agent
RESOLVED · shop-api

0.00%error rate across 890 requests

890 requests at 10 VUs · 0 pool exhaustion events · p95 780ms, stable through the post-fix burst.

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