  Surveys of exoplanet host stars are valuable tools for assessing population
level trends in exoplanets, and their outputs can include stellar ages,
activity, and rotation periods. We extracted chromospheric activity
measurements from the California-Kepler Survey (CKS) Gaia survey spectra in
order to probe connections between stellar activity and fundamental stellar
properties. Building on the California Kepler Survey's legacy of 1189 planet
host star stellar properties including temperature, surface gravity metallicity
and isochronal age, we add measurements of the Ca II H and K lines as a proxy
for chromospheric activity for 879 planet hosting stars. We used these
chromospheric activity measurements to derive stellar rotation periods. We find
a discrepancy between photometrically derived and activity-derived rotation
periods for stars on the Rossby Ridge. These results support the theory of
weakened magnetic braking. We find no evidence for metallicity-dependent
activity relations, within the metallicity range of -0.2 to +0.3 dex. With our
single epoch spectra we identify stars that are potentially in Maunder Minimum
like state using a combination of log (R'HK) and position below the
main-sequence. We do not yet have the multi-year time series needed to verify
stars in Maunder Minimum like states. These results can help inform future
theoretical studies that explore the relationship between stellar activity,
stellar rotation, and magnetic dynamos.
