The magnetic activity of the Sun becomes stronger and weaker over an 11 year cycle,
modulating the radiation and charged particle environment experienced by the Earth as
"space weather". Similar activity cycles in other Sun-like stars can have a profound
influence on planetary habitability. Ground-based synoptic programs to observe stellar
activity cycles have unique requirements for spectroscopic cadence and duration, which
are well suited to queue-scheduled operations using robotic telescopes. I will describe
how a blue-sensitive medium-resolution spectrograph that includes the Ca II H and K lines
can fruitfully be used to observe stellar rotation and activity cycles using the SONG
network, with negligible impact on the primary observing programs. The opportunities for
scientific discovery are particularly rich for younger and hotter stars, where the rotation
and cycle timescales are shorter and asteroseismic characterization is easier.