removed an unused import
oops, use our logger
correct the metrics output
Revert "correct the metrics output"

This reverts commit 3a5539764a67133b4d8b9d1c1fe1fdb9113696f3.
updated the prefetch to 20
updated the metrics output
- corrected the prefix
- made sure times are outputted in seconds
update the histogram output to match the timer
use interfaces for db, message broker, and pusher