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amazon-ssm-agent
An agent to enable remote management of your EC2 instances, on-premises servers, or virtual machines (VMs).
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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.
Clearly you've never seen the abomination that is Enterprise Java best practices. No, seriously, real world enterprise Java is exactly that horrible, only add in 500 XML files that "configure" things.
Java tends to be the default language outside of specific use cases where other languages fit better, e.g. on-host agents like the SSM agent will be written in something like Go because it's compiled and hence easier to distribute. But server code typically is Java.