I could reproduce the error with a new Checkmk instanz.
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Install checkmk version > 2.0.0
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Create new site + install plugin sslcertificates from Heinlein support (check_mk_extensions/sslcertificates at cmk2.0 · HeinleinSupport/check_mk_extensions · GitHub)
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monitor 1 Host with sslcertificates Plugin
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run
cmk-update-config -vvv
→ error at Plugin zypper
@dnLL do you use the same Plugin and can confirm this?