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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.
Multiload-ng still has some activity going on (github), so while it isn't necessarily super actively developed, if there's something that you're absolutely missing then you could always try your luck in there, or see if there's a fork or something.
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.