Distinguish latency, freshness, and correctness before promising a real-time metric.
The move: never let "real time" stand alone. Real-time analytics carries at least three promises: the screen responds quickly, the data is recent enough for the decision, and the calculation is correct enough to trust. Those are different promises. When they are not separated, teams optimize the visible part and miss the decision risk. Latency Latency is the time taken to serve or compute the answer. It is what users feel when a tile spins or a query hangs. Freshness Freshness is the age of the data at the moment of use. A fast tile with a 40-minute-old source is…
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