Monit の通知を外部のアプリケーションで行う場合に変数を受け渡す方法

結論

環境変数を用いる。

簡易具体例

result =<<~EOM
  対象サービス: #{ENV['MONIT_SERVICE']}
  詳細: #{ENV['MONIT_DESCRIPTION']}
EOM

puts result

具体的にはドキュメントを参照のこと

MONIT_SERVICE
The name of the service (from monitrc) for which the program is executed.

----------

The following environment variables are only available in the service start/stop/restart program and exec action context:

MONIT_EVENT
The event that occurred on the service

MONIT_DESCRIPTION
A description of the error condition

MONIT_DATE
The time and date (RFC 822 style) the event occurred

MONIT_HOST
The host the event occurred on