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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.
Since I've noticed this widget is a open-source project, I tracked down a github page, and reinstall it following his instruction. (https://github.com/dhabyx/plasma-simpleMonitor)
And I found serial more github pages, such as https://github.com/marco-parillo/plasma-simpleMonitor, and at AUR (https://aur.archlinux.org/packages/plasma5-applets-simplemonitor/). I figured it would be a good idea to uninstall this widget completely, and install it from AUR.
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.