{ "$schema": "https://example.com/schemas/event-log.json", "meta": { "generator": "bonsai gen-examples.mjs", "description": "A long event log — the kind of payload that is unreadable as a raw browser tab.", "generatedAt": "2026-09-01T00:00:00Z", "window": { "from": "2026-08-01T00:00:00.061Z", "to": "2026-08-01T00:01:20.008Z" }, "eventCount": 2000, "note": "Synthetic data. No real people, orders or payments are described here." }, "summary": { "services": { "checkout-api": { "events": 253, "errors": 33, "errorRate": 0.1304, "avgDurationMs": 529.54 }, "catalog-api": { "events": 267, "errors": 49, "errorRate": 0.1835, "avgDurationMs": 677.06 }, "identity": { "events": 252, "errors": 37, "errorRate": 0.1468, "avgDurationMs": 538.85 }, "search-indexer": { "events": 212, "errors": 28, "errorRate": 0.1321, "avgDurationMs": 488.16 }, "image-resizer": { "events": 253, "errors": 37, "errorRate": 0.1462, "avgDurationMs": 527.36 }, "notification-worker": { "events": 262, "errors": 29, "errorRate": 0.1107, "avgDurationMs": 487.76 }, "billing-ledger": { "events": 239, "errors": 27, "errorRate": 0.113, "avgDurationMs": 462.05 }, "recommendation-engine": { "events": 262, "errors": 36, "errorRate": 0.1374, "avgDurationMs": 573.14 } }, "regions": [ "eu-west-1", "eu-central-1", "us-east-1", "us-west-2", "ap-southeast-1" ], "levels": { "debug": 283, "info": 1158, "warn": 283, "error": 276 }, "unresolvedIncidents": [], "annotations": {} }, "events": [ { "seq": 1, "id": "evt_2b36047d7188d5ba", "traceId": "e9ed495b23f6f651807943b7d1a5af6e", "timestamp": "2026-08-01T00:00:00.061Z", "level": "warn", "service": "billing-ledger", "environment": "staging", "region": "eu-west-1", "http": { "method": "GET", "route": "/v1/catalog/products/:sku", "status": 304, "durationMs": 174.22, "requestBytes": 2460, "responseBytes": 52989, "cached": false }, "actor": { "userId": "u_125597", "sessionId": "18566528d6f732667d7e09d8", "plan": "enterprise", "country": "JP", "city": "Milano", "authenticated": true }, "metrics": { "cpuPercent": 36.2, "memoryMb": 141.3, "dbQueries": 10, "cacheHitRatio": 0.303, "queueDepth": 11 }, "tags": [], "error": null }, { "seq": 2, "id": "evt_d659db7cbb9eefe7", "traceId": "f84b2a7bd986d6e393997d4a5baccf81", "timestamp": "2026-08-01T00:00:00.085Z", "level": "info", "service": "billing-ledger", "environment": "production", "region": "eu-west-1", "http": { "method": "PATCH", "route": "/v1/carts/:cartId/checkout", "status": 200, "durationMs": 265.98, "requestBytes": 487, "responseBytes": 60034, "cached": false }, "actor": { "userId": "u_369135", "sessionId": "5d24e96de92e7413e5a9115e", "plan": "pro", "country": "BR", "city": "İzmir", "authenticated": true }, "metrics": { "cpuPercent": 99.3, "memoryMb": 1016.6, "dbQueries": 11, "cacheHitRatio": 0.6232, "queueDepth": 20 }, "tags": [ "checkout", "cold-start" ], "error": null }, { "seq": 3, "id": "evt_840e422887c076b4", "traceId": "4e5353ec23aff17ab0005be331315dcf", "timestamp": "2026-08-01T00:00:00.157Z", "level": "info", "service": "billing-ledger", "environment": "staging", "region": "ap-southeast-1", "http": { "method": "GET", "route": "/v1/catalog/products", "status": 200, "durationMs": 124.35, "requestBytes": 2174, "responseBytes": 64500, "cached": false }, "actor": { "userId": "u_168435", "sessionId": "4948981e162774e3da5efd0d", "plan": "pro", "country": "FR", "city": "São Paulo", "authenticated": true }, "metrics": { "cpuPercent": 37.7, "memoryMb": 282.9, "dbQueries": 20, "cacheHitRatio": 0.5225, "queueDepth": 8 }, "tags": [ "b2b", "cold-start", "b2b" ], "error": null }, { "seq": 4, "id": "evt_3992a06a24dd7458", "traceId": "0384bbd80260c535273d0743ab1c8070", "timestamp": "2026-08-01T00:00:00.194Z", "level": "warn", "service": "identity", "environment": "staging", "region": "ap-southeast-1", "http": { "method": "GET", "route": "/v1/orders/:orderId", "status": 204, "durationMs": 297.52, "requestBytes": 609, "responseBytes": 1058, "cached": false }, "actor": { "userId": "u_897322", "sessionId": "e65d1fab661359e9773be7dc", "plan": "starter", "country": "IT", "city": "São Paulo", "authenticated": true }, "metrics": { "cpuPercent": 89.5, "memoryMb": 756, "dbQueries": 20, "cacheHitRatio": 0.8355, "queueDepth": 38 }, "tags": [ "b2b" ], "error": null }, { "seq": 5, "id": "evt_71be4cd25e7c35b3", "traceId": "37e21145a5dbf2dc0ae89bfb278e4545", "timestamp": "2026-08-01T00:00:00.205Z", "level": "error", "service": "identity", "environment": "production", "region": "ap-southeast-1", "http": { "method": "PATCH", "route": "/v1/catalog/products/:sku", "status": 503, "durationMs": 2108.82, "requestBytes": 436, "responseBytes": 33453, "cached": false }, "actor": { "userId": "u_846285", "sessionId": "d75db8d3b55063ce0cea0d93", "plan": "pro", "country": "AU", "city": "München", "authenticated": false }, "metrics": { "cpuPercent": 95.5, "memoryMb": 320.5, "dbQueries": 8, "cacheHitRatio": 0.7409, "queueDepth": 36 }, "tags": [ "canary", "b2b", "mobile" ], "error": { "type": "ConflictError", "message": "cart was modified by another session", "retryable": true, "stack": [ "at handler (/srv/app/routes/orders.js:107:18)", "at dispatch (/srv/app/lib/router.js:102:22)", "at Server. (/srv/app/server.js:118:9)" ] } }, { "seq": 6, "id": "evt_77ccdbb65d3a018e", "traceId": "aeffc418c2823b683ed5d1c4718cb163", "timestamp": "2026-08-01T00:00:00.271Z", "level": "warn", "service": "catalog-api", "environment": "production", "region": "us-west-2", "http": { "method": "GET", "route": "/v1/carts/:cartId/checkout", "status": 204, "durationMs": 115.43, "requestBytes": 2252, "responseBytes": 62484, "cached": false }, "actor": { "userId": "u_159493", "sessionId": "786ff768311c0395f23100ca", "plan": "starter", "country": "US", "city": "Ålesund", "authenticated": true }, "metrics": { "cpuPercent": 79.6, "memoryMb": 519.8, "dbQueries": 8, "cacheHitRatio": 0.4818, "queueDepth": 30 }, "tags": [ "eu" ], "error": null }, { "seq": 7, "id": "evt_192abfe26e3fe8f1", "traceId": "5e8f1dac5e0cf6c7ec1e316746f43150", "timestamp": "2026-08-01T00:00:00.310Z", "level": "info", "service": "recommendation-engine", "environment": "staging", "region": "us-east-1", "http": { "method": "GET", "route": "/health", "status": 201, "durationMs": 7.89, "requestBytes": 553, "responseBytes": 51348, "cached": true }, "actor": { "userId": "u_287446", "sessionId": "4144272b0a981fd88e02b07f", "plan": "starter", "country": "GB", "city": "Milano", "authenticated": true }, "metrics": { "cpuPercent": 53.1, "memoryMb": 212.7, "dbQueries": 0, "cacheHitRatio": 0.8497, "queueDepth": 0 }, "tags": [ "mobile" ], "error": null }, { "seq": 8, "id": "evt_b40e2d951691d392", "traceId": "f0dc53601bc435937a4105d4f2e6cf00", "timestamp": "2026-08-01T00:00:00.335Z", "level": "info", "service": "image-resizer", "environment": "staging", "region": "us-west-2", "http": { "method": "PATCH", "route": "/v1/catalog/products", "status": 200, "durationMs": 332.68, "requestBytes": 3607, "responseBytes": 53757, "cached": false }, "actor": { "userId": "u_329166", "sessionId": "3d07e0c8cdd3c33f34d5c5d2", "plan": "pro", "country": "IT", "city": "Kraków", "authenticated": true }, "metrics": { "cpuPercent": 24.2, "memoryMb": 293.9, "dbQueries": 10, "cacheHitRatio": 0.6924, "queueDepth": 10 }, "tags": [ "retry", "mobile" ], "error": null }, { "seq": 9, "id": "evt_38937dac2eebd679", "traceId": "3993e77f80a795d4555a82246a5e7a43", "timestamp": "2026-08-01T00:00:00.363Z", "level": "info", "service": "identity", "environment": "production", "region": "us-east-1", "http": { "method": "DELETE", "route": "/v1/catalog/products", "status": 200, "durationMs": 229.83, "requestBytes": 1289, "responseBytes": 50479, "cached": true }, "actor": { "userId": "u_154977", "sessionId": "11f1390ace223339bbdab856", "plan": "pro", "country": "IT", "city": "İzmir", "authenticated": true }, "metrics": { "cpuPercent": 0.1, "memoryMb": 309.7, "dbQueries": 13, "cacheHitRatio": 0.4696, "queueDepth": 17 }, "tags": [ "slow-query", "mobile" ], "error": null }, { "seq": 10, "id": "evt_87010c066e2668f1", "traceId": "21930ba9f177556fd35f28eb9aa7a605", "timestamp": "2026-08-01T00:00:00.422Z", "level": "info", "service": "recommendation-engine", "environment": "production", "region": "eu-west-1", "http": { "method": "GET", "route": "/v1/users/:userId/preferences", "status": 200, "durationMs": 221.96, "requestBytes": 479, "responseBytes": 45523, "cached": false }, "actor": { "userId": "u_344328", "sessionId": "0bf139254eaa97075e521898", "plan": "enterprise", "country": "DE", "city": "Zürich", "authenticated": true }, "metrics": { "cpuPercent": 10.6, "memoryMb": 378.7, "dbQueries": 8, "cacheHitRatio": 0.2822, "queueDepth": 38 }, "tags": [ "checkout", "retry" ], "error": null }, { "seq": 11, "id": "evt_ea1fb77b97fd41ea", "traceId": "564488003654a034c5517558b74135e7", "timestamp": "2026-08-01T00:00:00.468Z", "level": "info", "service": "checkout-api", "environment": "staging", "region": "us-west-2", "http": { "method": "DELETE", "route": "/v1/orders/:orderId/items", "status": 200, "durationMs": 268.86, "requestBytes": 4019, "responseBytes": 13162, "cached": true }, "actor": { "userId": "u_104877", "sessionId": "c4883db71e3c7ffdbd43a0af", "plan": "enterprise", "country": "SG", "city": "İzmir", "authenticated": false }, "metrics": { "cpuPercent": 60.9, "memoryMb": 997.5, "dbQueries": 4, "cacheHitRatio": 0.1027, "queueDepth": 7 }, "tags": [ "b2b", "canary" ], "error": null }, { "seq": 12, "id": "evt_70ebcf8b82e2979b", "traceId": "9730a7de0d3fd5212b4d192553d30859", "timestamp": "2026-08-01T00:00:00.482Z", "level": "info", "service": "billing-ledger", "environment": "production", "region": "eu-central-1", "http": { "method": "GET", "route": "/health", "status": 204, "durationMs": 21.55, "requestBytes": 2117, "responseBytes": 19078, "cached": false }, "actor": { "userId": "u_563901", "sessionId": "d22151e3ee557514ed0e3b6b", "plan": "pro", "country": "BR", "city": "東京", "authenticated": true }, "metrics": { "cpuPercent": 94.8, "memoryMb": 607.7, "dbQueries": 3, "cacheHitRatio": 0.6061, "queueDepth": 11 }, "tags": [ "canary", "mobile", "cold-start" ], "error": null }, { "seq": 13, "id": "evt_49028c469fe5854e", "traceId": "c80d755eb11a47a9f124b3586b34616c", "timestamp": "2026-08-01T00:00:00.549Z", "level": "info", "service": "checkout-api", "environment": "production", "region": "us-west-2", "http": { "method": "GET", "route": "/v1/media/:assetId/thumbnail", "status": 204, "durationMs": 330.7, "requestBytes": 159, "responseBytes": 42289, "cached": true }, "actor": { "userId": "u_868148", "sessionId": "48e059a10a226b8b34584247", "plan": "enterprise", "country": "FR", "city": "Milano", "authenticated": false }, "metrics": { "cpuPercent": 52, "memoryMb": 806.2, "dbQueries": 19, "cacheHitRatio": 0.8105, "queueDepth": 22 }, "tags": [ "mobile", "retry", "checkout" ], "error": null }, { "seq": 14, "id": "evt_c2ce0e565d840754", "traceId": "553f56c2a81c1cbd7c9b95ba647fa14d", "timestamp": "2026-08-01T00:00:00.591Z", "level": "debug", "service": "recommendation-engine", "environment": "production", "region": "ap-southeast-1", "http": { "method": "DELETE", "route": "/v1/users/:userId/preferences", "status": 204, "durationMs": 308.27, "requestBytes": 46, "responseBytes": 4283, "cached": false }, "actor": { "userId": "u_976721", "sessionId": "89b9c89ca00729a496b414c0", "plan": "starter", "country": "AU", "city": "Zürich", "authenticated": true }, "metrics": { "cpuPercent": 17.6, "memoryMb": 240.8, "dbQueries": 15, "cacheHitRatio": 0.9018, "queueDepth": 7 }, "tags": [ "checkout", "b2b", "b2b" ], "error": null }, { "seq": 15, "id": "evt_f1b6c3cd027e0217", "traceId": "1f61b89151567d033449351e37661d25", "timestamp": "2026-08-01T00:00:00.623Z", "level": "info", "service": "search-indexer", "environment": "production", "region": "us-west-2", "http": { "method": "GET", "route": "/v1/users/:userId/preferences", "status": 200, "durationMs": 243.84, "requestBytes": 3036, "responseBytes": 63475, "cached": false }, "actor": { "userId": "u_710637", "sessionId": "83844ad038f3aff59bf671e4", "plan": "pro", "country": "SG", "city": "Zürich", "authenticated": true 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"timestamp": "2026-08-01T00:00:00.703Z", "level": "info", "service": "billing-ledger", "environment": "staging", "region": "us-east-1", "http": { "method": "GET", "route": "/v1/catalog/products", "status": 204, "durationMs": 200.67, "requestBytes": 3571, "responseBytes": 27043, "cached": true }, "actor": { "userId": "u_822643", "sessionId": "7fd02e9a2b504f1b0e87a943", "plan": "enterprise", "country": "ES", "city": "İzmir", "authenticated": true }, "metrics": { "cpuPercent": 70.9, "memoryMb": 735.1, "dbQueries": 21, "cacheHitRatio": 0.9662, "queueDepth": 13 }, "tags": [ "cold-start", "mobile", "retry" ], "error": null }, { "seq": 18, "id": "evt_97322646db527f56", "traceId": "58f40a07cac4c93e37ff7f9e5ada5f79", "timestamp": "2026-08-01T00:00:00.721Z", "level": "info", "service": "recommendation-engine", "environment": "production", "region": "us-west-2", "http": { "method": "POST", "route": "/v1/users/:userId/preferences", "status": 204, "durationMs": 182.7, "requestBytes": 792, "responseBytes": 1229, "cached": false }, "actor": { "userId": "u_583122", "sessionId": "a9dc0388f401d79b6a0e41b9", "plan": "free", "country": "BR", "city": "東京", "authenticated": true }, "metrics": { "cpuPercent": 21.1, "memoryMb": 519.6, "dbQueries": 23, "cacheHitRatio": 0.3799, "queueDepth": 26 }, "tags": [], "error": null }, { "seq": 19, "id": "evt_c1d476aa6d30a65d", "traceId": "c3b8c0966ebcce580a509d5fcedb00e9", "timestamp": "2026-08-01T00:00:00.771Z", "level": "debug", "service": "checkout-api", "environment": "staging", "region": "eu-central-1", "http": { "method": "POST", "route": "/v1/orders/:orderId", "status": 204, "durationMs": 208.44, "requestBytes": 3596, "responseBytes": 45980, "cached": true }, "actor": { "userId": "u_220708", "sessionId": "b7e77d8a7893e6ac232d491e", "plan": "enterprise", "country": "US", "city": "東京", "authenticated": true }, "metrics": { "cpuPercent": 64.9, "memoryMb": 599.3, "dbQueries": 15, "cacheHitRatio": 0.7488, "queueDepth": 0 }, "tags": [ "slow-query", "slow-query" ], "error": null }, { "seq": 20, "id": "evt_fdb9e528f88a23e4", "traceId": "9f4aeb6715a8084a775795840fdc09eb", "timestamp": "2026-08-01T00:00:00.805Z", "level": "info", "service": "catalog-api", "environment": "staging", "region": "eu-central-1", "http": { "method": "POST", "route": "/v1/catalog/products", "status": 200, "durationMs": 318.83, "requestBytes": 691, "responseBytes": 24197, "cached": true }, "actor": { "userId": "u_156235", "sessionId": "d5ae4cfe710cbb45d1c26039", "plan": "pro", "country": "IT", "city": "São Paulo", "authenticated": true }, "metrics": { "cpuPercent": 41.1, "memoryMb": 352, "dbQueries": 2, "cacheHitRatio": 0.8882, "queueDepth": 16 }, "tags": [ "b2b", "mobile" ], "error": null }, { "seq": 21, "id": "evt_6f3abeb2b3995f7d", "traceId": "c768e1e48885ec007046af03a5adbaa1", "timestamp": "2026-08-01T00:00:00.842Z", "level": "info", "service": "image-resizer", "environment": "staging", "region": "eu-central-1", "http": { "method": "DELETE", "route": "/health", "status": 200, "durationMs": 179.09, "requestBytes": 1733, "responseBytes": 59501, "cached": true }, "actor": { "userId": "u_524349", "sessionId": "f0a965db5b7c1fd8debe2cd2", "plan": "starter", "country": "BR", "city": "München", "authenticated": true }, "metrics": { "cpuPercent": 39.9, "memoryMb": 532.1, "dbQueries": 8, "cacheHitRatio": 0.888, "queueDepth": 23 }, "tags": [ "retry", "eu" ], "error": null }, { "seq": 22, "id": "evt_08ab5561245d8642", "traceId": "e324418a1a802b3e1a85b4fa6a10bd64", "timestamp": "2026-08-01T00:00:00.908Z", "level": "error", "service": "image-resizer", "environment": "staging", "region": "ap-southeast-1", "http": { "method": "PUT", "route": "/v1/media/:assetId/thumbnail", "status": 500, "durationMs": 2988.61, "requestBytes": 1430, "responseBytes": 31297, "cached": false }, "actor": { "userId": "u_962055", "sessionId": "67a864b4cb3166d1b8a7061c", "plan": "enterprise", "country": "SG", "city": "Milano", "authenticated": true }, "metrics": { "cpuPercent": 55.4, "memoryMb": 731, "dbQueries": 7, "cacheHitRatio": 0.5146, "queueDepth": 18 }, "tags": [ "mobile" ], "error": { "type": "ConflictError", "message": "cart was modified by another session", "retryable": true, "stack": [ "at handler (/srv/app/routes/orders.js:371:50)", "at dispatch (/srv/app/lib/router.js:153:55)", "at Server. 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