Fix metrics not shutting down if there are open connections #11951

Job	Run time
check-dependency-rules	9s
check-fail-ci	10s
check-markdown	14s
check-workspace	19s
preflight / preflight	45s
preflight / ci-versions	1m 0s
check-rust-feature-propagation	2m 3s
fmt	1m 7s
test-rust-features	2m 4s
check-toml-format	59s
check-umbrella	2m 18s
All quick checks passed	1s
	11m 9s

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