Massive log file

My Particle-Pi has been failing, during my digging I found a 1.2Gb log file.

/var/log/particle-agent.log

Is that normal? Rotating/deleting log files might be a good idea.
Although I note that since deleting the file (about an hour ago) it has not been recreated.

Filed the issue here: https://github.com/spark/particle-agent/issues/5