Add a logline every time we run a report, to help with debugging.

We are wondering why zendesk didn't complain when there are a bunch of
(legit) bug reports last weekend.  But we don't have enough data to
figure it out.  Hopefully this will help.

Auditors: alpert

Test Plan:
Ran it manually on toby and saw this output:

  2014-09-16 21:02:01 UTC] TOTAL 678/714185s; 1410899603-: 0/1121s; m=1.064 p=0