Calculate difference between current and previous values

Elastic Stack Beats
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Hi, I'm trying to create Watcher Alert for dropped packets system.network.in.dropped (the system metrics are shipped with Metricbeats) if more than 50 dropped packets are present alert should be generated. To do this I need calculate difference between current and previous values.

Screenshot 2022-04-12 141935
Screenshot 2022-04-12 1419351081×421 40.5 KB

What is the best way of doing it?

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i hope derivative aggregation might help in this situation.

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