I would look in your upgraded site why no RRD’s are written.
Can you have a look at your converted RRD files. They must be inside ~/var/check_mk/rrd. The old PNP4Nagios RRDs are inside ~/var/pnp4nagios/perfdata
Now the question is why nothing happens there.
If you have a problem with writing performance data then you should also have many error messages about this in your log files.
If you use now the CMC the CMC log file would be a good start.
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