{"ts":"2026-03-17T09:14:32.850Z","level":"error","service":"inventory-api","version":"2.3.0","env":"staging","host":"node-b1","logger":"shop/inventory/reserve","msg":"insufficient stock for reservation","http":{"method":"POST","route":"/api/orders","status":409,"duration_ms":50.32},"request_id":"req-000001","order_id":"ord-2026-0317-005466","seq":1}

{"ts":"2026-03-17T09:14:33.150Z","level":"debug","service":"checkout-api","version":"1.14.2","env":"staging","host":"node-a1","logger":"com.example.shop.checkout.PricingService","msg":"recomputed cart totals","http":{"method":"POST","route":"/api/checkout","status":201,"duration_ms":362.79},"request_id":"req-000002","order_id":"ord-2026-0317-009187","seq":2}
   
this line is not JSON at all — a bare stderr write from a C library
{"ts":"2026-03-17T09:14:33.550Z","level":"info","service":"checkout-api","version":"1.14.2","env":"staging","host":"node-a1","logger":"com.example.shop.checkout.OrderController","msg":"request completed","http":{"method":"POST","route":"/api/checkout","status":201,"duration_ms":95.31},"request_id":"req-000003","order_id":"ord-2026-0317-001239","seq":3}
{"ts":"2026-03-17T09:14:33.950Z","level":"warn","service":"inventory-api","version":"2.3.0","env":"staging","host":"node-b1","logger":"shop/inventory/reserve","msg":"reservation retried after conflict","http":{"method":"POST","route":"/api/orders","status":200,"duration_ms":208.58},"request_id":"req-000004","order_id":"ord-2026-0317-005214","seq":4}
[1, 2, 3]
null
{"ts":"2026-03-17T09:14:34.450Z","level":"info","service":"catalog","version":"0.0.1","env":"staging","host":"node-c1","logger":"shop/catalog/handler","msg":"request completed","http":{"method":"GET","route":"/api/catalog","status":200,"duration_ms":322.49},"request_id":"req-000005","order_id":"ord-2026-0317-001139","seq":5}