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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
You can, but you have to generate the metric and get it into a monitoring service (commonly prometheus) so kube's external metrics subsystem can see it and HPA can react to it.
NOTE:
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