With serials like
Node SN Model Namespace Usage Format FW Rev
---------------- -------------------- ---------------------------------------- --------- -------------------------- ---------------- --------
/dev/nvme0n1 285S100HTYST KXG50ZNV512G TOSHIBA 1 512,11 GB / 512,11 GB 512 B + 0 B AAGA4106
/dev/nvme1n1 S4GENX0N713949 SAMSUNG MZVLB512HBJQ-00000 1 474,89 GB / 512,11 GB 512 B + 0 B EXF7201Q
the internal names (by serial number) were rewritten to
Field Internal name Type Warn Crit Info
/dev/nvme0n1 _85S100HTYST_w derive
/dev/nvme1n1 S4GENX0N713949_w derive
--> the trailing underscore in case of nvme0n1 created problems in graph processing:
[RRD ERROR] Unable to graph /var/cache/munin/www/lxdserver/....agitos.de/nvme_bytes-month.png : undefined vname c285S100HTYST_r
Therefore I added a prefix 'SN_' for internal names.