It's quite passing. They are looking for leaks ("leeks").
"The libpoireau library intercepts a small fraction of calls to malloc/calloc/etc., to generate a statistically representative overview of an application's heap footprint. While the interceptor currently only tracks long-lived allocations (e.g., leaks) ..."
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[ 4.3 ms ] story [ 18.4 ms ] thread"The libpoireau library intercepts a small fraction of calls to malloc/calloc/etc., to generate a statistically representative overview of an application's heap footprint. While the interceptor currently only tracks long-lived allocations (e.g., leaks) ..."