Hiroshi Hatake

This feature is implemented in [Fluency](https://github.com/komamitsu/fluency#for-single-fluend). I think that this library's owners do not want to add this feature because they want to keep simple implementation.

Thanks for your review! I'll try to resolve issues which are pointed out.

Rebased!

> BTW, will you actually use AsyncRawSocketSender? No, I won't. It's just an experimental. > why don't you add a comment like this on the class? `This feature is highly...

> The thing is PlaceholderValidator does not allow a timekey larger than a day (https://github.com/fluent/fluentd/blob/master/lib/fluent/plugin/output.rb#L686) so it won't be possible to validate time placeholders for year and month using the...

I couldn't reproduce this issue with fluent-plugin-cloudwatch-logs v0.10.0: ```aconf @type forward @type stdout @type cloudwatch_logs region ap-northeast-1 aws_key_id aws_sec_key auto_create_stream true log_group_name fluentd log_stream_name_key mykey auto_create_stream true message_keys message @type...

@kenhys Could you check this issue?

> Err:1 http://deb.debian.org/debian stretch InRelease > Temporary failure resolving 'deb.debian.org' > Err:2 http://security.debian.org/debian-security stretch/updates InRelease > Temporary failure resolving 'security.debian.org' > Err:3 http://deb.debian.org/debian stretch-updates InRelease > Temporary failure resolving 'deb.debian.org'...

mongo-ruby-driver and its dependent bson gem do not support dot in key field. I'd filed a bug ticket in MongoDB JIRA: https://jira.mongodb.org/projects/RUBY/issues/RUBY-2562

> (By the way, fluent-logger-csharp is not maintained anymore, does it work with recent fluentd? ) For recent Fluentd, I think that [NLog.Targets.Fluentd](https://github.com/fluent/NLog.Targets.Fluentd) is recommended.