Test diagnostics #425

Job	Run time
diagnostic_aggregator on humble	3m 59s
diagnostic_aggregator on iron	4m 11s
diagnostic_aggregator on rolling	3m 40s
diagnostic_common_diagnostics on humble	3m 56s
diagnostic_common_diagnostics on iron	5m 58s
diagnostic_common_diagnostics on rolling	3m 48s
diagnostic_updater on humble	3m 5s
diagnostic_updater on iron	3m 17s
diagnostic_updater on rolling	3m 33s
self_test on humble	3m 21s
self_test on iron	3m 55s
self_test on rolling	3m 59s
	46m 42s

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