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Avoid iowait percentage's overflow when counter is reset #947

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merged 2 commits into from Nov 17, 2023
Merged

Avoid iowait percentage's overflow when counter is reset #947

merged 2 commits into from Nov 17, 2023

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Arthur1
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@Arthur1 Arthur1 commented Nov 16, 2023 •
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IOwait counter retrieved from /proc/stat can be reset.

I noticed that the "iowait" mode was also the only mode which had any counter resets.
prometheus/prometheus#2856 (comment)

I created a function to calculate the difference of counters considering resets to avoid overflows.

@Arthur1 Arthur1 self-assigned this Nov 16, 2023
ne-sachirou
ne-sachirou approved these changes Nov 17, 2023
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🙆‍♀️

@Arthur1 Arthur1 merged commit e6ac1b6 into master Nov 17, 2023
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@Arthur1 Arthur1 deleted the iowait-can-be-reset branch November 17, 2023 07:09
@mackerelbot mackerelbot mentioned this pull request Dec 1, 2023
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