Mackerel Support About monitoring Monitoring operations Is it possible to control which port the mackerel-agent uses? While it's not possible to control the port, we do support connection via proxy. For more information please refer to the section "I want to connect via HTTP Proxy." in the agent specs. Related articles The agent won’t startup. Is it possible to monitor network devices? What is the source IP address for Webhook and other services’ alert notifications from Mackerel? What environments are supported by Mackerel? Is it possible to download metrics and monitors?