node 8.12-pre - new metric build_info not returning valid json data

[gitmachtl]

$ cardano-node8 version
cardano-node 8.12.0 - linux-x86_64 - ghc-8.10
git rev ae8bc933ee6b6366c04854c1e127fd8dfb29b556

the new metric build_info returns pseudo json data. would be nice if its valid json data.

curl -s http://127.0.0.1:13798/metrics | grep build_info
cardano_node_metrics_cardano_build_info {version_major="8",version_minor="12",version_patch="0",version="8.12.0",revision="ae8bc933ee6b6366c04854c1e127fd8dfb29b556",compiler_name="ghc",compiler_version="8.10",compiler_version_major="8",compiler_version_minor="10",architecture="x86_64",os_name="linux"} 1

it also returns two values, the pseudo-json and the value 1

[github-actions]

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