Add documentation for extract line numbers in metrics

[Xiangs18]

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[Xiangs18]

@shahzebsiddiqui I am not sure why URL check failed. Docs was built successful though.

[shahzebsiddiqui]

@shahzebsiddiqui I am not sure why URL check failed. Docs was built successful though.

dont worry too much about the urlcheck sometimes they come and go and if its persistent issue then we need to fix it. It good practice to check the urlcheck and then navigate to website. The urlcheck has a timeout and retry limit you can take a look at https://github.com/buildtesters/buildtest/blob/devel/.github/workflows/urlchecker.yml for more details. I typically update the urls or fix them if its a known issue. Sometimes websites go down or url gets changed over time.

[shahzebsiddiqui]

@Xiangs18 i was looking at the first example, i think you should update the buildspec to remove linenum_to_stderr that one is not being used for anything and is not being described in the text above. I think we had this buildspec from the regression test perspective to capture stderr as well.

[Xiangs18]

fixed, this PR is ready to merge.

[shahzebsiddiqui]

thanks @Xiangs18 this looks good! I will merge this in