With kernel 5.10 makegraphs not update the media graphs. Looks like the proc interface for block devices is changed.
Is this a reminder for yourself or are you looking for someone to take this ticket and work on it?
This actually seems to be in collectd.
https://git.ipfire.org/?p=ipfire-2.x.git;a=commitdiff;h=86beff5f75a88cebe62f6d629cce3ae3768e231b
https://blog.ipfire.org/post/ipfire-2-25-core-update-157-available-for-testing
https://blog.ipfire.org/post/ipfire-2-25-core-update-157-released