• Check monitor settings such as log monitoring and process monitoring must be defined in the configuration file (mackerel-agent.conf) of the host on which mackerel-agent is installed.
• For this reason, unlike host metric monitoring, configuring a monitor for multiple hosts belonging to the same service / role is not possible from the Web console.
• You can standardize the monitors by distributing a unitary filed object to each host and then fetching them with the 'include' option.

For reference

• Using the official check plugin pack for check monitoring - Mackerel Docs
• Adding monitors for script checks - Mackerel Docs