Merge pull request #1120 from sozu-proxy/fix-display-of-backend-metrics #2931

Job	Run time
Test (false, stable)	3m 9s
Docker build and push to Docker Hub	8s
Test (false, beta)	3m 4s
Build documentation	2m 34s
Test (nightly, true)	3m 3s
Coverage	5m 34s
	17m 32s

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