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Finally taken the 2 minutes needed to stop mmcblk0/mmcblk1 flapping in #munin for my #Pi4:
#!/bin/sh
# Unversion the MMC to avoid mmcblk0/mmcblk1 flapping
/usr/share/munin/plugins/diskstats "$@" | sed 's/mmcblk[0-9][0-9]*/mmcblkN/g'
Context: one might get either mmcblk0 or mmcblk1 while booting. That's not a problem when using label-based booting, but that makes monitoring a little tricky.
Of course the same can be done for the #df plugin: it tracks mountpoints but the internal names are derived from the underlying blockdevices, so mmcblk{0,1} appear there as well.