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Always align scrapes even if tolerance is bigger than 1% of scrape interval 

When the scrape tolerance is bigger than 1% of the scrape interval, take
1% of the scrape interval as the tolerance instead of not aligning the
scrape at all.

Signed-off-by: Julien Pivotto <roidelapluie@o11y.eu>
This commit is contained in:
Julien Pivotto 2024-02-21 15:09:21 +01:00
parent aba0071480
commit e22b564049
1 changed files with 6 additions and 2 deletions
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8
scrape/scrape.go
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@ -1192,14 +1192,18 @@ mainLoop:
// Calling Round ensures the time used is the wall clock, as otherwise .Sub // Calling Round ensures the time used is the wall clock, as otherwise .Sub
// and .Add on time.Time behave differently (see time package docs). // and .Add on time.Time behave differently (see time package docs).
scrapeTime := time.Now().Round(0) scrapeTime := time.Now().Round(0)
if AlignScrapeTimestamps && sl.interval > 100*ScrapeTimestampTolerance { if AlignScrapeTimestamps {
tolerance := ScrapeTimestampTolerance
if maxTolerance := sl.interval / 100; tolerance < maxTolerance {
tolerance = maxTolerance
}
// For some reason, a tick might have been skipped, in which case we // For some reason, a tick might have been skipped, in which case we
// would call alignedScrapeTime.Add(interval) multiple times. // would call alignedScrapeTime.Add(interval) multiple times.
for scrapeTime.Sub(alignedScrapeTime) >= sl.interval { for scrapeTime.Sub(alignedScrapeTime) >= sl.interval {
alignedScrapeTime = alignedScrapeTime.Add(sl.interval) alignedScrapeTime = alignedScrapeTime.Add(sl.interval)
} }
// Align the scrape time if we are in the tolerance boundaries. // Align the scrape time if we are in the tolerance boundaries.
if scrapeTime.Sub(alignedScrapeTime) <= ScrapeTimestampTolerance { if scrapeTime.Sub(alignedScrapeTime) <= tolerance {
scrapeTime = alignedScrapeTime scrapeTime = alignedScrapeTime
} }
} }