circuitstats.h: * 1000 is approx 2.5 days worth of continual-use circuits. */
circuitstats.h:#define CBT_NCIRCUITS_TO_OBSERVE 1000
circuitstats.h:#define CBT_MAX_RECENT_CIRCUITS 1000
circuitstats.h:#define CBT_MAX_MAX_RECENT_TIMEOUT_COUNT 10000
circuitstats.h:#define CBT_MAX_MIN_CIRCUITS_TO_OBSERVE 10000
circuitstats.h:#define CBT_DEFAULT_TIMEOUT_INITIAL_VALUE (60*1000)

this seems to have been moved into src/cor/or/circuitstats.h

use grep to search for other missing / moved variables. Thanks for the tip >>1241 , >>1242 .