[ntuple] Add ROOT_EXPERIMENTAL_EXPORT_RNTUPLE_METRICS - #23110
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The export path was memoized in a local static variable, so it was fixed by the first call and ignored later changes. I triggered this bug when needed to set ROOT_EXPORT_RNTUPLE_METRICS via gSystem->Setenv().
albfsg
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silverweed
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August 19, 2026 12:07
Introduce a new environment variable to allow the user to state its intention to activate metrics and where to store them in a usable way which doesn't require source code modifications. If the environment variable `ROOT_EXPORT_RNTUPLE_METRICS` is set, metrics are automatically: - Enabled on construction, and any counter added afterwards through MakeCounter() is enabled as well. - Stored in the `.root` file path (relative or absolute) set by `ROOT_EXPORT_RNTUPLE_METRICS` on destruction The generated .root file will contain one RNTuple for each component with its metrics enabled. Each RNTuple will have a flat schema consisting of fully qualified counter names, such as RPageSinkFile_timeCpuZip. There is one entry per counter, which means if a counter appears more than once in a given RNTuple, all instances will be merged. Comes with a unit test. Modifies the output of the integration test roottest-root-ntuple-metrics-metrics_env_enabled, as the implementation of the automatic metrics storage uses the RNTupleMerger under the hood, which triggers a warning message.
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This Pull request:
Changes or fixes:
ROOT_EXPORT_RNTUPLE_METRICSintoROOT_EXPERIMENTAL_EXPORT_RNTUPLE_METRICSGetMetricsExportPathROOT_EXPERIMENTAL_EXPORT_RNTUPLE_METRICSto a .root file automatically enables the metrics and saves them in the .root file.Checklist:
This PR fixes #
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