Remove unused class variable from heartbeat/monitor.py
Remove unused class variable from heartbeat/monitor.py

harrissoerja/vumi,vishwaprakashmishra/xmatrix,vishwaprakashmishra/xmatrix,harrissoerja/vumi,TouK/vumi,harrissoerja/vumi,TouK/vumi,vishwaprakashmishra/xmatrix,TouK/vumi