This is for host labels. Service labels have to be generated in the discovery function of the check plugin. Have a look at check_mk_extensions/sslcertificates/lib/check_mk/base/plugins/agent_based/sslcertificates.py at 17c17fd3c6af140e2c95f61b95c6bbb623f95cb7 · HeinleinSupport/check_mk_extensions · GitHub
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