Test diagnostics #400

Job	Run time
diagnostic_aggregator on humble	6m 23s
diagnostic_aggregator on iron	4m 32s
diagnostic_aggregator on rolling	5m 11s
diagnostic_common_diagnostics on humble	5m 34s
diagnostic_common_diagnostics on iron	4m 30s
diagnostic_common_diagnostics on rolling	4m 24s
diagnostic_updater on humble	4m 42s
diagnostic_updater on iron	4m 32s
diagnostic_updater on rolling	5m 16s
self_test on humble	4m 7s
self_test on iron	4m 19s
self_test on rolling	4m 44s
	58m 14s

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