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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.
Most Linux distribution images in EC2 include cloud-init which runs on startup and retrieves the user data. If you are using a standard Linux distribution AMI then it's probably cloud-init that is taking actions based on your user data, and so cloud-init's documentation on User Data Formats is the relevant reference for you.
NOTE:
The number of mentions on this list indicates mentions on common posts plus user suggested alternatives.
Hence, a higher number means a more popular project.