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Fix textfile crashes with duplicate metrics #759

Merged
merged 2 commits into from
Jun 24, 2021
Merged

Fix textfile crashes with duplicate metrics #759

merged 2 commits into from
Jun 24, 2021

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breed808
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Resolves #755

@breed808 breed808 requested a review from a team as a code owner April 18, 2021 04:25
@carlpett
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Just making sure I read this correctly: This PR will check for duplicates within each file (but not across multiple files), and drop the entire file in case there are duplicates? We would still expose those files that do not have duplicates, but set collector_success to 0?
There was some work on this a couple of years ago in #274 which might have some valuable historical context as well.

@breed808
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Yes, that's correct. Looking at the link you provided I realise this implementation is somewhat naive, as it won't detect duplicates in different files.

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The strictest/"most correct" would probably be to merge all textfiles, and then check the complete set for validity. If it is not valid, we reject the entire textfile collector results, and emit no metrics at all.
Do you think that'd be reasonably easy to implement? I guess it'd involve a bunch of buffering, or trying to do something clever...

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breed808 commented May 1, 2021

It might be possible by stuffing each MetricFamily into a slice defined before the file loop, then checking for duplicates 🤔
I'll have a look and see if I can get it working.

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I've got this working and passing CI, have a look and let me know if there's any concerns.

carlpett
carlpett reviewed May 17, 2021
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Nice! Some minor questions

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@breed808
Check duplicates across entire textfile set
5072879 
Check all textfile metrics will be checked for duplicates. If duplicates
are detected, drop all metrics and log error.

Signed-off-by: Ben Reedy <[email protected]>
@breed808 breed808 requested a review from carlpett June 18, 2021 23:43
carlpett
carlpett approved these changes Jun 21, 2021
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Sorry, missed the push! Looks good, very nice work!

@breed808 breed808 merged commit 4b2cd0a into prometheus-community:master Jun 24, 2021
@breed808 breed808 deleted the textfile branch June 24, 2021 22:36
anubhavg-icpl pushed a commit to anubhavg-icpl/windows_exporter that referenced this pull request Sep 22, 2024
@breed808
Merge pull request prometheus-community#759 from breed808/textfile
ddb64db 
Fix textfile crashes with duplicate metrics
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Successfully merging this pull request may close these issues.

Invalid textfile collector file brings down whole exporter
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@breed808 @carlpett