Do not allow invalid latency values in metrics

[aledbf]

No description provided.

[codecov-io]

Codecov Report

Merging #2844 into master will decrease coverage by <.01%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master    #2844      +/-   ##
==========================================
- Coverage   47.34%   47.34%   -0.01%     
==========================================
  Files          75       75              
  Lines        5413     5414       +1     
==========================================
  Hits         2563     2563              
- Misses       2525     2527       +2     
+ Partials      325      324       -1

Impacted Files	Coverage Δ
internal/ingress/metric/collectors/socket.go	79.81% <50%> (+0.09%)	⬆️
internal/watch/file_watcher.go	80.76% <0%> (-3.85%)	⬇️

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[antoineco]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aledbf, antoineco

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