[Bug 257316] kstat.zfs sysctl tree unreachable for pools with "." in the name

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=257316

--- Comment #3 from commit-hook@FreeBSD.org ---
A commit in branch stable/12 references this bug:

URL:
https://cgit.FreeBSD.org/src/commit/?id=98c467192082b3d4a6c91eeaa80868bb5231534c

commit 98c467192082b3d4a6c91eeaa80868bb5231534c
Author:     Alan Somers <asomers@FreeBSD.org>
AuthorDate: 2021-07-21 21:11:00 +0000
Commit:     Alan Somers <asomers@FreeBSD.org>
CommitDate: 2021-08-22 22:43:50 +0000

    Escape any '.' characters in sysctl node names

    ZFS creates some sysctl nodes that include a pool name, and '.' is an
    allowed character in pool names.  But it's the separator in the sysctl
    tree, so it can't be included in a sysctl name.  Replace it with "%25".
    Handily, "%" is illegal in ZFS pool names, so there's no ambiguity
    there.

    PR:             257316
    Sponsored by:   Axcient
    Reviewed by:    freqlabs
    Differential Revision: https://reviews.freebsd.org/D31265

    (cherry picked from commit 6c9506559080da2914749bf611225d7c0a153609)

 sys/kern/kern_sysctl.c | 47 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

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