{ "$schema": "https://example.com/schemas/event-log.json", "meta": { "generator": "bonsai gen-examples.mjs", "description": "A very large event log, sized to stay inside the viewer’s full-speed tier.", "generatedAt": "2026-09-01T00:00:00Z", "window": { "from": "2026-08-01T00:00:00.042Z", "to": "2026-08-01T00:04:40.023Z" }, "eventCount": 7000, "note": "Synthetic data. No real people, orders or payments are described here." }, "summary": { "services": { "checkout-api": { "events": 882, "errors": 117, "errorRate": 0.1327, "avgDurationMs": 556.73 }, "catalog-api": { "events": 874, "errors": 120, "errorRate": 0.1373, "avgDurationMs": 532.03 }, "identity": { "events": 849, "errors": 104, "errorRate": 0.1225, "avgDurationMs": 532.55 }, "search-indexer": { "events": 860, "errors": 123, "errorRate": 0.143, "avgDurationMs": 558.27 }, "image-resizer": { "events": 867, "errors": 136, "errorRate": 0.1569, "avgDurationMs": 570.81 }, "notification-worker": { "events": 888, "errors": 130, "errorRate": 0.1464, "avgDurationMs": 565.31 }, "billing-ledger": { "events": 877, "errors": 126, "errorRate": 0.1437, "avgDurationMs": 552.58 }, "recommendation-engine": { "events": 903, "errors": 121, "errorRate": 0.134, "avgDurationMs": 540.33 } }, "regions": [ "eu-west-1", "eu-central-1", "us-east-1", "us-west-2", "ap-southeast-1" ], "levels": { "debug": 969, "info": 4017, "warn": 1037, "error": 977 }, "unresolvedIncidents": [], "annotations": {} }, "events": [ { "seq": 1, "id": "evt_875a8170d4529688", "traceId": "4003d2d4f8ea61a60fcf46f6ac43560f", "timestamp": "2026-08-01T00:00:00.042Z", "level": "info", "service": "image-resizer", "environment": "staging", "region": "ap-southeast-1", "http": { "method": "GET", "route": "/v1/search", "status": 201, "durationMs": 275.81, "requestBytes": 1310, "responseBytes": 51041, "cached": false }, "actor": { "userId": "u_237867", "sessionId": "2b33d815c1e979e54591b85f", "plan": "starter", "country": "BR", "city": "München", "authenticated": true }, "metrics": { "cpuPercent": 94.9, "memoryMb": 239, "dbQueries": 23, "cacheHitRatio": 0.9199, "queueDepth": 19 }, "tags": [], "error": null }, { "seq": 2, "id": "evt_aab04846a634b1a6", "traceId": "5bb8c3d05f3dd6ec1365399ae0784986", "timestamp": "2026-08-01T00:00:00.092Z", "level": "error", "service": "notification-worker", "environment": "production", "region": "eu-west-1", "http": { "method": "PATCH", "route": "/v1/catalog/products", "status": 503, "durationMs": 3186.21, "requestBytes": 2845, "responseBytes": 57861, "cached": false }, "actor": { "userId": "u_373205", "sessionId": "1be94d8dfcd0fdfc2efa711b", "plan": "pro", "country": "DE", "city": "São Paulo", "authenticated": true }, "metrics": { "cpuPercent": 56, "memoryMb": 699.5, "dbQueries": 14, "cacheHitRatio": 0.6317, "queueDepth": 16 }, "tags": [ "checkout" ], "error": { "type": "ValidationError", "message": "field \"quantity\" must be a positive integer", "retryable": false, "stack": [ "at handler (/srv/app/routes/orders.js:126:78)", "at dispatch (/srv/app/lib/router.js:24:10)", "at Server. (/srv/app/server.js:118:9)" ] } }, { "seq": 3, "id": "evt_3169ef6d3964266d", "traceId": "64ece6852d8090dff9af18d0d40f6c1e", "timestamp": "2026-08-01T00:00:00.159Z", "level": "warn", "service": "image-resizer", "environment": "production", "region": "us-west-2", "http": { "method": "PATCH", "route": "/v1/search", "status": 200, "durationMs": 51.95, "requestBytes": 2750, "responseBytes": 32006, "cached": false }, "actor": { "userId": "u_702983", "sessionId": "e69100f2eecf494b3df6f1c2", "plan": "pro", "country": "US", "city": "Zürich", "authenticated": true }, "metrics": { "cpuPercent": 39.2, "memoryMb": 289.8, "dbQueries": 2, "cacheHitRatio": 0.5855, "queueDepth": 35 }, "tags": [ "eu", "retry", "eu" ], "error": null }, { "seq": 4, "id": "evt_6682bd6e12a9845c", "traceId": "48429af105c5f50bbc0dec4a0a86dee7", "timestamp": "2026-08-01T00:00:00.194Z", "level": "info", "service": "notification-worker", "environment": "production", "region": "eu-central-1", "http": { "method": "POST", "route": "/v1/carts/:cartId/checkout", "status": 204, "durationMs": 153.24, "requestBytes": 326, "responseBytes": 45026, "cached": false }, "actor": { "userId": "u_119316", "sessionId": "b842d85fb590574bdb344703", "plan": "pro", "country": "AU", "city": "München", "authenticated": false }, "metrics": { "cpuPercent": 18.6, "memoryMb": 478.4, "dbQueries": 14, "cacheHitRatio": 0.567, "queueDepth": 10 }, "tags": [ "checkout", "checkout" ], "error": null }, { "seq": 5, "id": "evt_b67078a2dd5fbb68", "traceId": "e74ebea89c419187d3a3d899b5e5a7e4", "timestamp": "2026-08-01T00:00:00.202Z", "level": "debug", "service": "identity", "environment": "staging", "region": "eu-central-1", "http": { "method": "PATCH", "route": "/v1/catalog/products/:sku", "status": 200, "durationMs": 237.82, "requestBytes": 4053, "responseBytes": 24115, "cached": false }, "actor": { "userId": "u_475047", "sessionId": "07b928a293048e00cc93e323", "plan": "starter", "country": "ES", "city": "İzmir", "authenticated": true }, "metrics": { "cpuPercent": 1, "memoryMb": 512.5, "dbQueries": 12, "cacheHitRatio": 0.0259, "queueDepth": 6 }, "tags": [], "error": null }, { "seq": 6, "id": "evt_63f317cf83d3fdd3", "traceId": "9f28be4c7f084202021410631c485770", "timestamp": "2026-08-01T00:00:00.263Z", "level": "info", "service": "catalog-api", "environment": "production", "region": "ap-southeast-1", "http": { "method": "POST", "route": "/v1/orders/:orderId/items", "status": 200, "durationMs": 205.81, "requestBytes": 2692, "responseBytes": 17770, "cached": false }, "actor": { "userId": "u_387901", "sessionId": "e72fb1af3b6e65d19305ecc3", "plan": "pro", "country": "JP", "city": "Zürich", "authenticated": true }, "metrics": { "cpuPercent": 16.4, "memoryMb": 693.4, "dbQueries": 4, "cacheHitRatio": 0.0465, "queueDepth": 10 }, "tags": [ "b2b", "canary" ], "error": null }, { "seq": 7, "id": "evt_5d6a07a7e4ab3479", "traceId": "91e5a7e5c98ea5cfda3887cc5356e391", "timestamp": "2026-08-01T00:00:00.312Z", "level": "debug", "service": "billing-ledger", "environment": "production", "region": "eu-west-1", "http": { "method": "GET", "route": "/v1/search", "status": 204, "durationMs": 200.91, "requestBytes": 3970, "responseBytes": 4210, "cached": true }, "actor": { "userId": "u_976202", "sessionId": "92b1741bedd13d7dc8ff2a28", "plan": "starter", "country": "ES", "city": "Kraków", "authenticated": true }, "metrics": { "cpuPercent": 52.4, "memoryMb": 991.5, "dbQueries": 15, "cacheHitRatio": 0.3813, "queueDepth": 5 }, "tags": [], "error": null }, { "seq": 8, "id": "evt_984c51da15eb60ec", "traceId": "fb503550a5ea886f8f381af124025f60", "timestamp": "2026-08-01T00:00:00.335Z", "level": "error", "service": "checkout-api", "environment": "production", "region": "eu-central-1", "http": { "method": "PATCH", "route": "/health", "status": 429, "durationMs": 4114.51, "requestBytes": 3529, "responseBytes": 14341, "cached": false }, "actor": { "userId": "u_571182", "sessionId": "f28f9fd386dd56aa81f2d1a1", "plan": "enterprise", "country": "FR", "city": "Zürich", "authenticated": true }, "metrics": { "cpuPercent": 39.8, "memoryMb": 726.8, "dbQueries": 4, "cacheHitRatio": 0.1756, "queueDepth": 19 }, "tags": [], "error": { "type": "ConflictError", "message": "cart was modified by another session", "retryable": true, "stack": [ "at handler (/srv/app/routes/orders.js:92:43)", "at dispatch (/srv/app/lib/router.js:23:77)", "at Server. (/srv/app/server.js:118:9)" ] } }, { "seq": 9, "id": "evt_cbf2bf508059dfe2", "traceId": "5067891c5f2cdf7f9e299b1557ab4d7f", "timestamp": "2026-08-01T00:00:00.379Z", "level": "warn", "service": "search-indexer", "environment": "staging", "region": "us-east-1", "http": { "method": "PUT", "route": "/v1/carts/:cartId/checkout", "status": 200, "durationMs": 233.05, "requestBytes": 2481, "responseBytes": 30786, "cached": false }, "actor": { "userId": "u_375597", "sessionId": "2df1174e1d657ce29b882457", "plan": "starter", "country": "AU", "city": "Ålesund", "authenticated": true }, "metrics": { "cpuPercent": 29.5, "memoryMb": 170.7, "dbQueries": 7, "cacheHitRatio": 0.3488, "queueDepth": 36 }, "tags": [], "error": null }, { "seq": 10, "id": "evt_494bed1840d600c0", "traceId": "6f14138322d849d256ad1fe752247eef", "timestamp": "2026-08-01T00:00:00.431Z", "level": "info", "service": "catalog-api", "environment": "staging", "region": "us-west-2", "http": { "method": "PATCH", "route": "/v1/media/:assetId/thumbnail", "status": 304, "durationMs": 321.42, "requestBytes": 1994, "responseBytes": 23635, "cached": false }, "actor": { "userId": "u_154941", "sessionId": "0dc51b20290f2851fd07f95c", "plan": "enterprise", "country": "IT", "city": "Kraków", "authenticated": true }, "metrics": { "cpuPercent": 94.5, "memoryMb": 996.6, "dbQueries": 0, "cacheHitRatio": 0.8251, "queueDepth": 38 }, "tags": [ "checkout", "b2b", "checkout" ], "error": null }, { "seq": 11, "id": "evt_1742055bd4795deb", "traceId": "9ede521d5dda61dae8f4686907ae70a0", "timestamp": "2026-08-01T00:00:00.466Z", "level": "info", "service": "catalog-api", "environment": "production", "region": "eu-central-1", "http": { "method": "DELETE", "route": "/v1/catalog/products", "status": 304, "durationMs": 333.19, "requestBytes": 2686, "responseBytes": 43786, "cached": false }, "actor": { "userId": "u_455959", "sessionId": "b0fc301fcceef1498b1e4300", "plan": "enterprise", "country": "SG", "city": "İzmir", "authenticated": true }, "metrics": { "cpuPercent": 87.9, "memoryMb": 197.6, "dbQueries": 5, "cacheHitRatio": 0.6424, "queueDepth": 16 }, "tags": [ "b2b", "checkout" ], "error": null }, { "seq": 12, "id": "evt_048698f69f94807b", "traceId": "f86a63d5390ce9eb90985bc147d4badc", "timestamp": "2026-08-01T00:00:00.480Z", "level": "error", "service": "notification-worker", "environment": "production", "region": "eu-central-1", "http": { "method": "PUT", "route": "/v1/catalog/products/:sku", "status": 502, "durationMs": 2071.46, "requestBytes": 400, "responseBytes": 45104, "cached": false }, "actor": { "userId": "u_280749", "sessionId": "ce303b9ae0220b5208456a2c", "plan": "free", "country": "SG", "city": "Ålesund", "authenticated": true }, "metrics": { "cpuPercent": 43.3, "memoryMb": 866.2, "dbQueries": 22, "cacheHitRatio": 0.7581, "queueDepth": 15 }, "tags": [ "checkout" ], "error": { "type": "UpstreamTimeout", "message": "catalog-api did not respond within 2000 ms", "retryable": true, "stack": [ "at handler (/srv/app/routes/orders.js:83:29)", "at dispatch (/srv/app/lib/router.js:89:31)", "at Server. (/srv/app/server.js:118:9)" ] } }, { "seq": 13, "id": "evt_ebcf6a5cdaf28f52", "traceId": "64d10690b84ef318ed93f6d22760b65e", "timestamp": "2026-08-01T00:00:00.549Z", "level": "debug", "service": "catalog-api", "environment": "production", "region": "eu-west-1", "http": { "method": "POST", "route": "/v1/orders/:orderId", "status": 201, "durationMs": 225.63, "requestBytes": 3542, "responseBytes": 29350, "cached": false }, "actor": { "userId": "u_174825", "sessionId": "85526de994dce744eea112da", "plan": "free", "country": "JP", "city": "東京", "authenticated": true }, "metrics": { "cpuPercent": 57.5, "memoryMb": 375.7, "dbQueries": 20, "cacheHitRatio": 0.6504, "queueDepth": 14 }, "tags": [ "checkout", "slow-query" ], "error": null }, { "seq": 14, "id": "evt_95793dd1b8d0df02", "traceId": "31e6d58137c6fbd9a8f293b7eefcb4f5", "timestamp": "2026-08-01T00:00:00.562Z", "level": "debug", "service": "catalog-api", "environment": "staging", "region": "us-east-1", "http": { "method": "GET", "route": "/v1/search", "status": 200, "durationMs": 340.71, "requestBytes": 2923, "responseBytes": 7057, "cached": false }, "actor": { "userId": "u_311487", "sessionId": "9a3d33a7ee4558dd0cc95cc4", "plan": "starter", "country": "ES", "city": "İzmir", "authenticated": false }, "metrics": { "cpuPercent": 94, "memoryMb": 372.1, "dbQueries": 17, "cacheHitRatio": 0.9415, "queueDepth": 31 }, "tags": [ "canary" ], "error": null }, { "seq": 15, "id": "evt_3b82395cfe9b9d60", "traceId": "caf4c88c76f8ee79489e34817f977e08", "timestamp": "2026-08-01T00:00:00.618Z", "level": "debug", "service": "catalog-api", "environment": "production", "region": "eu-west-1", "http": { "method": "PUT", "route": "/v1/orders/:orderId/items", "status": 200, "durationMs": 192.4, "requestBytes": 2051, "responseBytes": 32616, "cached": false }, "actor": { "userId": "u_457636", "sessionId": "f1a0f1b9ab7c9b151c01588e", "plan": "starter", "country": "IT", "city": "São Paulo", "authenticated": true }, "metrics": { "cpuPercent": 31.5, "memoryMb": 907.4, "dbQueries": 3, "cacheHitRatio": 0.7478, "queueDepth": 4 }, "tags": [ "checkout", "b2b", "slow-query" ], "error": null }, { "seq": 16, "id": "evt_4217c857148be787", "traceId": "9def8aeeae6cc9f89f74d8fa262a282e", "timestamp": "2026-08-01T00:00:00.668Z", "level": "warn", "service": "identity", "environment": "staging", "region": "eu-central-1", "http": { "method": "GET", "route": "/health", "status": 201, "durationMs": 238.19, "requestBytes": 3359, "responseBytes": 10905, "cached": false }, "actor": { "userId": "u_315128", "sessionId": "cdbe5a126f5d6ae468e06da2", "plan": "pro", "country": "BR", "city": "Ålesund", "authenticated": true }, "metrics": { "cpuPercent": 23.7, "memoryMb": 824.4, "dbQueries": 5, "cacheHitRatio": 0.1462, "queueDepth": 3 }, "tags": [ "b2b", "mobile", "mobile" ], "error": null }, { "seq": 17, "id": "evt_bc57a1b129d8e49b", "traceId": "e39cf2e752c1b66e972262bcb17802bf", "timestamp": "2026-08-01T00:00:00.688Z", "level": "info", "service": 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