Check [CONTRIBUTING guideline](https://github.com/fluent/fluentd/blob/master/CONTRIBUTING.md) first and here is the list to help us investigate the problem.

- fluentd or td-agent version.
- Environment information:
	- Operating system: `cat /etc/os-release`
	- Kernel version: `uname -r`
- Your configuration
- Your problem explanation. If you have an error logs, write it together.
