conntrack: Add operational metrics on errors for hash computation and aggregators

[ronensc]

This PR adds the following operational metrics that count errors during hash computation and in the aggregators.

conntrack_aggregator_errors{error="MissingFieldError",field="Bytes"} 11
conntrack_aggregator_errors{error="Float64ConversionError",field="Bytes"} 22
conntrack_hash_errors{error="MissingFieldError",field="Missing"} 33

[github-actions]

New image: quay.io/netobserv/flowlogs-pipeline:8fdf2a6. It will expire after two weeks.

[codecov]

Codecov Report

Merging #416 (7cc95d6) into main (381890d) will increase coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #416      +/-   ##
==========================================
+ Coverage   64.62%   64.75%   +0.13%     
==========================================
  Files          94       94              
  Lines        6629     6645      +16     
==========================================
+ Hits         4284     4303      +19     
+ Misses       2101     2099       -2     
+ Partials      244      243       -1     

Flag	Coverage Δ
unittests	64.75% <100.00%> (+0.13%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/test/utils.go	72.66% <ø> (ø)
pkg/pipeline/extract/conntrack/aggregator.go	98.13% <100.00%> (+2.98%)	⬆️
pkg/pipeline/extract/conntrack/conntrack.go	93.40% <100.00%> (+0.03%)	⬆️
pkg/pipeline/extract/conntrack/hash.go	84.21% <100.00%> (+0.87%)	⬆️
pkg/pipeline/extract/conntrack/metrics.go	100.00% <100.00%> (ø)
pkg/pipeline/extract/conntrack/store.go	81.37% <100.00%> (+0.46%)	⬆️

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[jpinsonneau]

LGTM in terms of code (not tested). Thanks @ronensc !

[ronensc]

Rebased and added another operational metric to count how connections are getting ended per scheduling group, either by getting FIN flag or by timing out.

conntrack_end_connections{group="0: DEFAULT",reason="FIN_flag"} 11
conntrack_end_connections{group="0: DEFAULT",reason="timeout"} 22

[ronensc]

/approve

[openshift-ci]

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