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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.
As to which consumer is reading from which topics, ACLs help you with managing this (ok, you wouldn't know if a consumer doesn't read from a topic which it is allowed to read from). For consumer lag tracking check out Burrow, which should help you with that (e.g. also can send out notifications as per its docs, haven't tried this myself though).
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