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PackageKit
A D-BUS abstraction layer that allows the user to manage packages in a secure way using a cross-distro, cross-architecture API.
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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.
I think what OP is using for updates is the gnome software application which is based on the more general packagekit framework (KDE's discover uses the same framework). And one feature of packagekit is the ability to install updates at shutdown (Sorry, can't find a better link in a quick search)
NOTE:
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Hence, a higher number means a more popular project.