Add kstats tracking gang allocations
Gang blocks have a significant impact on the long and short term
performance of a zpool, but there is not a lot of observability into
whether they're being used. This change adds gang-specific kstats to
ZFS, to better allow users to see whether ganging is happening.
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Reviewed-by: Alexander Motin <mav at FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2 at llnl.gov>
Signed-off-by: Paul Dagnelie <paul.dagnelie at klarasystems.com>
Closes #17003
UnifiedSplitRaw
