For this particular satellite, I think it's actually both. One of the components of the imaging system failed relatively early on[1], but they've worked around

For this particular satellite, I think it's actually both. One of the components of the imaging system failed relatively early on[1], but they've worked around the issue for the past 20 years. 1: https://landsat.gsfc.nasa.gov/satellites/landsat-7/ https://landsat.gsfc.nasa.gov/satellites/landsat-7/