Full Answer
Backfilling data with Measurement Protocol: Timestamp limits:
- Maximum age: 72 hours
- Events older than 72 hours: Rejected
- No exceptions or workarounds How to send timestamped events: timestamp_micros format: Unix timestamp in microseconds (seconds × 1,000,000) What works:
- Events from past 72 hours
- Near-real-time delayed events
- Batch processing with small delays What doesn't work:
- Last week's data
- Historical imports
- Migration from other systems For historical data: Use GA4 Data Import instead: 1. Admin → Data Import 2. Upload CSV files 3. Supports...