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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.
Based on your requirements it sounds like AWStats [1] may be a fit. It's rather old-school but it's simple and works great on access logs and can be run on any node that you consolidate your logs to. It's had a sketchy security history so run it on something only you can access and/or put decent authentication in front of it.
[1] - https://github.com/eldy/AWStats
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