homebrew tap to install mackerel-agent
% brew tap mackerelio/mackerel-agent
% brew install mackerel-agent
and mkr
% brew install mkr
You can bump up version with tools/update.rb.
e.g.
% ruby tools/update.rb mackerel-agent latest
If you'd like to specify the new version explicitly:
% ruby tools/update.rb mackerel-agent 0.51.0