feat: add periodic WARNING metrics to assist in debugging #18907

Job	Run time
owlbot-py	1m 14s
generate-readme	1m 13s
owlbot-yaml	1m 14s
gitignore_correctness	1m 13s
root-pom	1m 39s
group_id_check_for_maps_libraries	9m 1s
gapic-bom	1m 40s
package_name_check	1m 6s
	18m 20s

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