[2.3.0] Checkmk Werk 15517 created: check_cert: Fixed metrics in output

[//]: # (werk v2) # check_cert: Fixed metrics in output key | value ---------- | --- date | 2024-09-23T14:48:43+00:00 version | 2.3.0p19 class | fix edition | cre component | checks level | 2 compatible | yes The active check for monitoring certificates produces two metrics by now. These metrics have been written in a broken format and therefore never been created. This is now fixed and both metrics are now available. The affected metrics are * certificate_remaining_validity (is also used for Perf-O-Meter) * overall_execution_time