evdev: use a prometheus-safe label for ev_sysctl_tree
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Authored by kevans on Jun 30 2026, 2:21 PM.

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rGcb8bda40695f: evdev: use a prometheus-safe label for ev_sysctl_tree

Summary

Prometheus doesn't allow spaces, let's normalize this to what we use
elsewhere for consistency. The sysctl exporter could probably do this
itself, but let's decouple that from the immediate problem: matching the
label between the exported data and in-tree is nice for greppability.