record a metric with open census to ensure backwards compat #16050

Job	Run time
setup-environment	16s
govulncheck	36s
lint	3m 11s
checks	1m 42s
unittest-matrix (~1.21.5)	2m 20s
unittest-matrix (~1.20.12)	2m 7s
cross-build-collector (darwin, amd64)	46s
test-coverage	3m 34s
cross-build-collector (darwin, arm64)	41s
cross-build-collector (linux, 386)	45s
cross-build-collector (linux, amd64)	43s
cross-build-collector (linux, arm64)	46s
cross-build-collector (linux, ppc64le)	41s
cross-build-collector (linux, arm, 7)	40s
cross-build-collector (linux, s390x)	47s
cross-build-collector (windows, 386)	44s
cross-build-collector (windows, amd64)	42s
unittest	1s
	21m 2s

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