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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.
Since this is the standard Ubuntu image it's presumably cloud-init which is interpreting your user_data, in which case there are two other possible techniques to use to get this key registered.
NOTE:
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