Test diagnostics #399

Job	Run time
diagnostic_aggregator on humble	4m 18s
diagnostic_aggregator on iron	5m 0s
diagnostic_aggregator on rolling	4m 36s
diagnostic_common_diagnostics on humble	4m 59s
diagnostic_common_diagnostics on iron	4m 11s
diagnostic_common_diagnostics on rolling	3m 51s
diagnostic_updater on humble	4m 55s
diagnostic_updater on iron	3m 35s
diagnostic_updater on rolling	3m 30s
self_test on humble	4m 58s
self_test on iron	4m 28s
self_test on rolling	4m 21s
	52m 42s

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