Export Prometheus metrics

[loaynaser3]

adding option for "exporter"
this is an initial PR, simple way of exporting metrics
@yonahd , @Yuni-sa how you think we should proceed from here ?

[Yuni-sa]

@loaynaser3 @yonahd
this looks really good I think I have everything else set up regarding the helm packaging and deployment can I add it here or should I create I different pr for the helm chart?

[Yuni-sa]

also, it's probably best to source the time interval from an environment variable, allowing for easy changes from the helm chart.

[yonahd]

@loaynaser3 @yonahd this looks really good I think I have everything else set up regarding the helm packaging and deployment can I add it here or should I create I different pr for the helm chart?

Let's put the chart changes in a separate PR

[yonahd]

also, it's probably best to source the time interval from an environment variable, allowing for easy changes from the helm chart.

+1
Just create some default value if the environment variable doesn't exist.

[codecov-commenter]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (f3235b0) 49.36% compared to head (3c44abd) 42.82%.
Report is 4 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #87      +/-   ##
==========================================
- Coverage   49.36%   42.82%   -6.54%     
==========================================
  Files          15       17       +2     
  Lines        1493     1749     +256     
==========================================
+ Hits          737      749      +12     
- Misses        657      898     +241     
- Partials       99      102       +3     

Files	Coverage Δ
pkg/kor/exporter.go	5.71% <5.71%> (ø)

... and 14 files with indirect coverage changes

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[yonahd]

@loaynaser3 Looking over the implementation now.
There is a use case that comes to mind where a user want to run kor only for some resources and would still like to get metrics. What would be the cost of implementing this as a flag for the commands?
e.g.
kor cm,secret --metrics
or something like that

[loaynaser3]

@yonahd i thought of this scenario but i didnt see the use of it.
regarding this change its not a major change, we can add a call function to root and change the if condition to switch case

[yonahd]

@yonahd i thought of this scenario but i didnt see the use of it. regarding this change its not a major change, we can add a call function to root and change the if condition to switch case

Ok. Let's keep it this way for now.
Is this ready for review?

[loaynaser3]

@yonahd yes

[yonahd]

@loaynaser3 Looks good.
A couple small comments

[yonahd]

@loaynaser3 Can you also change the name of the pull request

[yonahd]

LGTM