changed records_size to records_batch_size

[rockspore]

Close #112

Not merging this time till metrics got approved.

[codecov]

Codecov Report

Merging #113 (0027bcb) into master (9be01f4) will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #113   +/-   ##
=====================================
  Coverage      85%    85%           
=====================================
  Files          29     29           
  Lines        1760   1760           
=====================================
  Hits         1493   1493           
  Misses        153    153           
  Partials      114    114           

Impacted Files	Coverage Δ
analytics/manager.go	84% <ø> (ø)

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[rockspore]

No need to have this renaming. We can do a mapping somewhere else.