Well, most of the actual sensors are in space ;) but yes, telemetry collected via the DSN gets routed through JPL first.

Also, in addition to the SSD website linked upthread, the NAIF site [0] (where the SPICE library and kernels can be downloaded) also seems to be down. It would not surprise me in any way if some of these facilities are hosted on-prem and are in a power-down state due to the fires.

(Speaking of the DSN, their website [1] is also down.)

[0] https://naif.jpl.nasa.gov/naif/toolkit.html

[1] https://deepspace.jpl.nasa.gov/