mackerel-client 
mackerel-client is a ruby library to access Mackerel (https://mackerel.io/). CLI tool mkr is also provided.
Usage
@mackerel = Mackerel::Client.new(:mackerel_api_key => "<Put your API key")
host = @mackerel.get_host("<hostId>")CLI
Host
- Get host(s) information from hostname or service, role.
mkr.rb host info [--name foo] [--service service] [--role role]
- Set status of a host
mkr.rb host status --host-id foo --status working
- Retire a host
mkr.rb host retire --host-id foo
- Get status of a host (not implemented yet)
mkr.rb host status --host-id foo
Note: CLI command name has been changed to mkr.rb from 0.0.7.
Primary CLI mkr is implemented in Go (https://github.com/mackerelio/mkr).
Authentication
export MACKEREL_APIKEY=foobar