{ "license": "CC BY 4.0", "recipe": { "slug": "telemetry-volume-by-event-name", "title": "Measure Telemetry Volume by Event Name", "testedWith": "Apache DataFusion 45.2.0", "lastReviewed": "2026-07-28" }, "contract": { "tableName": "telemetry_ingestion_events", "schema": [ { "name": "timestamp_utc", "type": "Timestamp", "description": "Ingestion attempt time in UTC." }, { "name": "event_name", "type": "Utf8", "description": "Controlled event name." }, { "name": "source", "type": "Utf8", "description": "Bounded producer or SDK source." }, { "name": "payload_bytes", "type": "Int64", "description": "Serialized event size before transport compression." }, { "name": "accepted", "type": "Boolean", "description": "Whether ingestion accepted the event." }, { "name": "environment", "type": "Utf8", "description": "Deployment environment." } ] }, "query": "SELECT\n event_name,\n source,\n COUNT(*) AS events,\n SUM(payload_bytes) AS total_payload_bytes,\n AVG(payload_bytes) AS avg_payload_bytes,\n SUM(CASE WHEN accepted THEN 0 ELSE 1 END) AS rejected_events,\n 100.0 * SUM(CASE WHEN accepted THEN 0 ELSE 1 END)\n / NULLIF(COUNT(*), 0) AS rejection_rate_pct\nFROM telemetry_ingestion_events\nWHERE timestamp_utc >= now() - INTERVAL '24 hours'\n AND environment = 'production'\nGROUP BY event_name, source\nORDER BY total_payload_bytes DESC, event_name;", "fixtureKind": "reproducible", "inputRows": [ { "timestamp_utc": "2026-07-28T18:00:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:59:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:58:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:57:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": false, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:30:00.000Z", "event_name": "llm_request_completed", "source": "api", "payload_bytes": 1800, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:29:00.000Z", "event_name": "llm_request_completed", "source": "api", "payload_bytes": 2000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:28:00.000Z", "event_name": "llm_request_completed", "source": "api", "payload_bytes": 2200, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:00:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 500, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:59:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 520, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:58:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 480, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:57:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 510, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:56:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 530, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:55:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 460, "accepted": false, "environment": "production" } ], "illustrativeInputRows": [ { "timestamp_utc": "2026-07-28T18:00:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:59:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:58:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:57:00.000Z", "event_name": "debug_trace", "source": "worker", "payload_bytes": 4000, "accepted": false, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:30:00.000Z", "event_name": "llm_request_completed", "source": "api", "payload_bytes": 1800, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:29:00.000Z", "event_name": "llm_request_completed", "source": "api", "payload_bytes": 2000, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:28:00.000Z", "event_name": "llm_request_completed", "source": "api", "payload_bytes": 2200, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T17:00:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 500, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:59:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 520, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:58:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 480, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:57:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 510, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:56:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 530, "accepted": true, "environment": "production" }, { "timestamp_utc": "2026-07-28T16:55:00.000Z", "event_name": "page_viewed", "source": "web", "payload_bytes": 460, "accepted": false, "environment": "production" } ], "expectedOutput": { "columns": [ "event_name", "source", "events", "total_payload_bytes", "avg_payload_bytes", "rejected_events", "rejection_rate_pct" ], "rows": [ { "event_name": "debug_trace", "source": "worker", "events": 4, "total_payload_bytes": 16000, "avg_payload_bytes": 4000, "rejected_events": 1, "rejection_rate_pct": 25 }, { "event_name": "llm_request_completed", "source": "api", "events": 3, "total_payload_bytes": 6000, "avg_payload_bytes": 2000, "rejected_events": 0, "rejection_rate_pct": 0 }, { "event_name": "page_viewed", "source": "web", "events": 6, "total_payload_bytes": 3000, "avg_payload_bytes": 500, "rejected_events": 1, "rejection_rate_pct": 16.66666667 } ] }, "notes": [ "The included synthetic input rows generate the expected output when timestamps are shifted into the documented query window.", "Run this fixture in the public browser SQL playground; the selected query executes locally with DuckDB-Wasm.", "Adapt time windows, thresholds, identities, and business definitions before operational use." ] }