Fix fail count calculation

[dougkei]

lastFetch is in millisecond while the divisor is interval in second

[pivotal-issuemaster]

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[codecov]

Codecov Report

Merging #3723 into master will not change coverage.
The diff coverage is 0%.

@@            Coverage Diff            @@
##             master    #3723   +/-   ##
=========================================
  Coverage     65.84%   65.84%           
  Complexity     1593     1593           
=========================================
  Files           203      203           
  Lines          7455     7455           
  Branches        877      877           
=========================================
  Hits           4909     4909           
  Misses         2225     2225           
  Partials        321      321

Impacted Files	Coverage Δ	Complexity Δ
...rk/cloud/netflix/eureka/EurekaHealthIndicator.java	15.78% <0%> (ø)	2 <0> (ø)	⬇️

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[spencergibb]

Can you describe the error you are seeing?