dtrace_io(4) on FreeBSD
The text aa13d43510d1, as FreeBSD 15.0-RELEASE, FreeBSD 14.3-RELEASE, FreeBSD 14.2-RELEASE, FreeBSD 14.1-RELEASE, FreeBSD 14.0-RELEASE, FreeBSD 13.5-RELEASE, FreeBSD 13.4-RELEASE, FreeBSD 13.3-RELEASE shipped it.
a DTrace provider for tracing events related to disk I/O