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James M Snell
b9e257f5cb
Cloning a histogram with `structuredClone()` or `postMessage()` shares the native histogram instead of copying it. Capturing the state of a histogram at a point in time, while other code keeps recording into it, requires serializing it with `export()` and parsing the result with `importHistogram()`. Add `histogram.snapshot()`, which returns a new, independent `Histogram` containing a copy of the histogram's configuration, recorded values, `exceeds` count, and EWMA state, without the serialization round trip. Values cannot be recorded into the returned histogram. The method is available on all histograms, including `RecordableHistogram` and `ELDHistogram` instances. Signed-off-by: James M Snell <jasnell@gmail.com> Assisted-by: OpenCode PR-URL: https://github.com/nodejs/node/pull/66099 Reviewed-By: Matteo Collina <matteo.collina@gmail.com>