A comment below Was “I have the farts, again” broadcast from the Moon to the whole world? links to this humorous video clip of the 1997 comedy movie RocketMan about astronauts on Mars. Personnel on the ground discuss the methane level reported in the space suit telemetry.
I would expect that modern, real space suits report things like temperature, pressure and (possibly) humidity, as well as levels of oxygen and CO2, but what about other trace gasses that might indicate a space suit failure or issue, or a medical condition of the occupant? Ketones, methane, or other byproducts of life processes perhaps?