GraalVM smoke tests

Add tests for metric `pending.connections.time` with status `ERROR` #57

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Run time

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Job	Run time
build (ubuntu-20.04, native)	3m 7s
build (ubuntu-20.04, nio)	3m 7s
build (macos-11, native)	5m 8s
build (macos-11, nio)	4m 58s
build (windows-2022, nio)	4m 40s
	21m 0s