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The custom values are the "le" bucket boundaries of native histograms with custom buckets. They are never modified. It is ok to not copy them when iterating a chunk, just reference them. If we will ever have a function that modifies the custom values, like 'trim' for example. That function will have to make a copy on write. Signed-off-by: György Krajcsovits <gyorgy.krajcsovits@grafana.com>