[Traffic Control] Fix blocked metric #80675

Job	Run time
license-check	1m 1s
diff	7s
windows-build (windows-ghcloud)	9m 8s
test-extra (ubuntu-ghcloud)	26m 1s
test (ubuntu-ghcloud)	30m 5s
clippy	3m 44s
move-test	0s
simtest	15m 34s
cargo-deny (bans, licenses, sources)	36s
cargo-deny (advisories)	37s
rustfmt	19s
cutting a new execution layer	1m 20s
test-extra	0s
test	0s
	1h 28m 32s

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