Merge pull request #47555 from rumpl/feat-c8d-prom #5

Job	Run time
validate-dco / run	23s
build	1m 51s
test (dockerd, client, integration)	16m 25s
test (dockerd, cmd/buildctl, integration)	6m 17s
test (dockerd, solver, integration)	6m 22s
test (dockerd, frontend, integration)	6m 36s
test (dockerd, frontend/dockerfile, integration)	19m 46s
test (dockerd-containerd, client, integration)	18m 17s
test (dockerd-containerd, cmd/buildctl, integration)	6m 21s
test (dockerd-containerd, solver, integration)	6m 22s
test (dockerd-containerd, frontend, integration)	6m 27s
test (dockerd-containerd, frontend/dockerfile, integration)	20m 38s
	1h 55m 45s

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