You can uninstall mackerel-agent by following the uninstall instructions for your OS.
For Linux users
You can uninstall mackerel-agent using the uninstall command in the package manager.
If you want to uninstall everything including plugins, please execute the following command.
Amazon Linux / Amazon Linux2 / CentOS / Red Hat
sudo yum remove mackerel-agent mackerel-agent-plugins mackerel-check-plugins mkr
Ubuntu / Debian
sudo apt-get remove mackerel-agent mackerel-agent-plugins mackerel-check-plugins mkr
If you are using Windows
Uninstall mackerel-agent from Start > Control Panel > Programs > Programs and Features.