And indeed it might not be currently active and might just log locally. If so then why call it telemetry instead of a log file, which is the standard terminology for local monitoring?
Also it might be harmless now, but maybe a few versions later...
@bob @ekaitzzarraga @aral @paul @measlytwerp Open about:config, search for all settings with 'http' in them, delete the string. (Except maybe for update notifications.)