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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.
If there doesn't exist one already, it's probably doable to remove the lines in https://github.com/KDE/plasma-desktop/tree/master/applets/taskmanager which contain the icon and install it as a custom widget.
NOTE:
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Hence, a higher number means a more popular project.