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Currently all staleness markers are appended for any sample that disappears from scrape cache, even if that sample was never appended to TSDB. When staleness markers are appended they always use ref=0 as the SeriesRef, so the downstream appender doesn't know if the sample is for a know series or not. This changes the scrape cache so the map used for staleness tracking stores the cache entry instead of only the label set. Having the cache entry means: - we can ignore stale samples that didn't end up in TSDB (not in the scrape cache) - we can append them to TSDB using correct ref value, so the appender knows if they are for know or unknown series Signed-off-by: Lukasz Mierzwa <l.mierzwa@gmail.com>