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textsize
Emacs package textsize.el to automatically choose a font point size for the Emacs default face.
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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.
Perhaps using https://github.com/WJCFerguson/textsize
You could also try using a timer to monitor any changes in the current frame's monitor. This repo may be useful dispwatch.
I have nearly the same problem (just different displays), so I use a Wayland version of Emacs: https://github.com/mpsq/emacs-gcc-wayland-devel-builder
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