Merge branch 'charts' into 'master'

go.mod

go.sum

node/Makefile

node/bindata.go

node/http.go

node/metrics.go

node/static/css/uPlot.min.css

node/static/css/uPlot.min.css.br

node/static/css/uPlot.min.css.gz

node/static/js/autoradio.js

node/static/js/autoradio.js.br

node/static/js/autoradio.js.gz

node/static/js/uPlot.iife.min.js

node/static/js/uPlot.iife.min.js.br

node/static/js/uPlot.iife.min.js.gz

node/templates/index.html

vendor/github.com/json-iterator/go/.codecov.yml

vendor/github.com/json-iterator/go/.gitignore

vendor/github.com/json-iterator/go/.travis.yml

vendor/github.com/json-iterator/go/Gopkg.lock