Add cmd line option to control redacting of config metrics

[oliver006]

Fixed #609

[coveralls]

Pull Request Test Coverage Report for Build 1481

• 10 of 10 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 92.015%

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Totals
Change from base Build 1479:	0.03%
Covered Lines:	1671
Relevant Lines:	1816

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💛 - Coveralls

[codecov]

Codecov Report

Merging #611 (18f8833) into master (6ddefae) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #611      +/-   ##
==========================================
+ Coverage   88.02%   88.06%   +0.03%     
==========================================
  Files          16       16              
  Lines        1804     1810       +6     
==========================================
+ Hits         1588     1594       +6     
  Misses        145      145              
  Partials       71       71              

Impacted Files	Coverage Δ
exporter/exporter.go	91.90% <100.00%> (+0.09%)	⬆️

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