Fix process metric precision #30512

Job	Run time
unit-test (17, windows-latest, datanode)	36m 13s
unit-test (17, windows-latest, others)	23m 11s
unit-test (17, ubuntu-latest, datanode)	24m 38s
unit-test (17, ubuntu-latest, others)	18m 39s
	1h 42m 41s

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