Don't interleave histogram metrics in multi-process collector #1148
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The OpenMetrics exposition format requires that samples for a given Metric (i.e. metric name and label set) are not interleaved, but the way that the multi-process collector handled accumulating histogram metrics could end up interleaving them. Restructure it slightly to guarantee that all the samples for a given Metric are kept together. Fixes: prometheus#1147 Signed-off-by: Colin Watson <cjwatson@debian.org>
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The OpenMetrics exposition format requires that samples for a given Metric (i.e. metric name and label set) are not interleaved, but the way that the multi-process collector handled accumulating histogram metrics could end up interleaving them. Restructure it slightly to guarantee that all the samples for a given Metric are kept together.
Fixes: #1147