[pull] main from prometheus:main #39
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We use the cache iteration number to detect when the same metric has occurred twice in a scrape. We need to bump this number at the end of every scrape, not just successful scrapes. The `iter` number is also used: * After a successful scrape, to delete older metrics and metadata. * To detect when metadata changed in this scrape. None of those additional cases is broken by incrementing the number on error. Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
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