This is a program to notify slack of mackerel's open alert.
https://github.com/mackerelio/mackerel-client-go
used mackerel-client-go.
$ go get github.com/ashwanthkumar/slack-go-webhook
$ go get github.com/mackerelio/mackerel-client-go
$ export MACKEREL_APIKEY="XXXXXXXX"
add slack webhook,cannnel
$ go run main.go
