The highest tagged major version is v3.

go-systemd/

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Go bindings to systemd socket activation, journal and D-BUS APIs.

Path	Synopsis
activation Package activation implements primitives for systemd socket activation.	Package activation implements primitives for systemd socket activation.
dbus Integration with the systemd D-Bus API.	Integration with the systemd D-Bus API.
journal Package journal provides write bindings to the systemd journal	Package journal provides write bindings to the systemd journal