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This code can not even be enabled without patching and has no use without some external tools. 32 additional bytes in zio_t plus their initialization/destruction is too high cost for rarely used development tool. Making it conditional under METASLAB_TRACE define reduces zio_t on FreeBSD by 64 bytes due to stucture alignment and removed the initialization from CPU profiles. Reviewed-by: Paul Dagnelie <[email protected]> Reviewed-by: Brian Behlendorf <[email protected]> Signed-off-by: Alexander Motin <[email protected]> Closes #18714