>>/10269/
>  zdb -e
Took about 1 hour for that to run, each of the two times. Error=last one or two metaslabs are broken, whatever that means:
> $ sudo zdb -e zb | tail # I pressed enter and pasted in "\npasted in a newline here\n"
> loading concrete vdev 0, metaslab 475 of 1047 ...
> loading concrete vdev 0, metaslab 650 of 1047 ... 
> pasted in a newline here
> loading concrete vdev 0, metaslab 1046 of 1047 ...size rt_space (0x8cb000  ASSERT at ../../module/zfs/range_tree.c:439:range_tree_remove_impl() 16656989 [...] ZFS plain file
>  16656990 2 128K 128K 1.01M 512 1M 100.00 ZFS plain file
>  16656991 2 128K 128K 1.01M 512 1M 100.00 ZFS plain file
> [...]
>  16656997 2 128K 128K 1.01M 512 1M 100.00 ZFS plain file
>  16656998 1 128K 1K 4K 512 1K 100.00
> $ # Where is "../../module/zfs/range_tree.c"?
Error
> ASSERT at ../../module/zfs/range_tree.c:439:range_tree_remove_impl()
is similar to
> kernel:[279654.540599] PANIC: zfs: adding existent segment to range tree (offset=a011368c000 size=8cb000)

>  created a 1.2-GB text file
And that's the non-verbose zpool "database" before zdb "crashed" due to range_tree_remove_impl() in line 439 of C file "range_tree.c". Last two lines of "zdb --help" are:
> Specify an option more than once (e.g. -bb) to make only that option verbose
> Default is to dump everything non-verbosely

La La La La Luna redownloaded:
> /z9/youtube/PonyPMVs_-_UPSCALED_Pony_Music_Videos_Archive_UC64MPOjBQ52HKfPRo50PUhQ/Luna_pony_parody_-_Donn_DeVore_and_The_Cutie_Marks_-_PMV-_4K_ESRGAN_UPSCALE-PonyPMVs_-_UPSCALED_Pony_Music_Videos_Archive-20230811-youtube-3840x2160-SJ23n3HZAqA.webm
Bit odd that this video was upscaled, for it's just one still image.