add convenience now metrics #918

Job	Run time
kitchen / prepare-matrix	3s
kitchen / run-kitchen-tests (centos-stream-9)	2m 16s
kitchen / run-kitchen-tests (ubuntu-2404)	1m 50s
kitchen / run-kitchen-tests (fedora-40)	1m 46s
kitchen / run-kitchen-tests (ubuntu-2204)	1m 55s
kitchen / run-kitchen-tests (centos-stream-10)	2m 0s
kitchen / run-kitchen-tests (debian-12)	1m 46s
	11m 36s

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