Merge pull request #939 from SiaFoundation/pj/prune-metric-timerfc3339 #758

Job	Run time
dispatch (siafoundation/homebrew-sia)	2s
build-mac (mainnet)	4m 11s
build-linux (mainnet)	2m 30s
dispatch (siafoundation/linux)	2s
build-windows (mainnet)	5m 36s
build-mac (zen)	4m 47s
build-linux (zen)	2m 31s
build-windows (zen)	4m 47s
docker (mainnet)	7m 32s
docker (zen)	7m 32s
	39m 30s

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