Hey @blimmer,

That's a good question. Code Climate doesn't yet have the functionality to ignore issues based on severity, but it looks like you can control whether warnings are emitted in ESLint with the --quiet flag:

Handling warnings
--quiet

This option allows you to disable reporting on warnings. If you enable this option, only errors are reported by ESLint.

Example:
eslint --quiet file.js

source: http://eslint.org/docs/user-guide/command-line-interface#handling-warnings

I could see this option managed via the .codeclimate.yml config file. Enabling it would prompt the engine to append the --quiet flag.

---
engines:
  eslint:
    enabled: true
    channel: eslint-3
    config:
      ignore_warnings: true

A downside is that you wouldn't see these warnings anywhere in the codeclimate.com interface, since they would cease to be emitted by the engine. Might be a good workaround for now though.

This was implemented in #144. Going to go ahead and close this issue! Thanks!