post: add rados req lat post

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
post: add link to updated post

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
post: add link to lttng post

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>
post: forgot to add pic

Signed-off-by: Noah Watkins <noahwatkins@gmail.com>