fix(sys_metric_stat.go): typo

[ecafkoob]

Describe what this PR does / why we need it

fix log typo

Does this pull request fix one issue?

Describe how you did it

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Special notes for reviews

[CLAassistant]

All committers have signed the CLA.

[sczyh30]

LGTM

[codecov-commenter]

Codecov Report

Merging #426 (b87c582) into master (d9b691b) will not change coverage.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master     #426   +/-   ##
=======================================
  Coverage   53.43%   53.43%           
=======================================
  Files          89       89           
  Lines        5820     5820           
=======================================
  Hits         3110     3110           
  Misses       2361     2361           
  Partials      349      349           

Impacted Files	Coverage Δ
core/system_metric/sys_metric_stat.go	17.55% <0.00%> (ø)

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[sczyh30]

Thanks for contributing!