Title: mssql_counters.file_sizes: Added readable titles of related metrics
Level: 1
Component: checks
Compatible: compat
Version: 1.2.8p25
Date: 1500891539
Class: fix

Previously the titles of the metrics 'data_files', 'log_files_used'
and 'log_files' were generated automatically and were not readable.
Now they have readable titles.
