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Ensure that timestamp comparison uses wall clock time (backport #8601) 

It's not possible to assume subtraction and addition of a time.Time will
result in consistent values.

Signed-off-by: David Leadbeater <dgl@dgl.cx>
This commit is contained in:
David Leadbeater 2021-03-15 13:05:17 +00:00 committed by Julien Pivotto
parent 34ca0bb20a
commit 168d8d4f5f
1 changed files with 4 additions and 2 deletions
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6
scrape/scrape.go
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@ -1005,7 +1005,7 @@ func (sl *scrapeLoop) run(interval, timeout time.Duration, errc chan<- error) {
var last time.Time
alignedScrapeTime := time.Now()
alignedScrapeTime := time.Now().Round(0)
ticker := time.NewTicker(interval)
defer ticker.Stop()
@ -1023,7 +1023,9 @@ mainLoop:
// Temporary workaround for a jitter in go timers that causes disk space
// increase in TSDB.
// See https://github.com/prometheus/prometheus/issues/7846
scrapeTime := time.Now()
// Calling Round ensures the time used is the wall clock, as otherwise .Sub
// and .Add on time.Time behave differently (see time package docs).
scrapeTime := time.Now().Round(0)
if AlignScrapeTimestamps && interval > 100*scrapeTimestampTolerance {
// For some reason, a tick might have been skipped, in which case we
// would call alignedScrapeTime.Add(interval) multiple times.