The first unmanned test of the Lunar Module was done in mission Apollo 5 LM 1. The separation of the ascent stage from the descent stage was done during flight. Did they install additional sensors and telemetry channels to supervize the separation?
Additional instrumentation known as Development Flight Instrumentation (DFI) was present.
The Apollo Experience Report - Development Flight Instrumentation (p. 38)- states
A total of 195 DFI measurements was installed on the LM-1 vehicle for the Apollo 5 mission. The flight equipment used is listed in table C-11. The instrumentation system performed satisfactorily, with the exception of seven measurements that did not respond as planned. Four thermocouple measurements malfunctioned (probably became unbonded), and three low-pressure measurements failed (probably because of constricted ports from engine firing).
Unfortunately the referenced table lists the components used by the DFI system, but does not list the parameters that were monitored.
Page 48 of the Post-Flight Mission Report discusses the sensors that failed.