この3つ。
- output: Add slow_flush_log_threshold parameter https://github.com/fluent/fluentd/pull/1366
- formatter_csv: Change fields parameter to required. Now accepts both a,b and ["a", "b"] https://github.com/fluent/fluentd/pull/1361
- in_syslog: Add "priority_key" and "facility_key" parameters https://github.com/fluent/fluentd/pull/1351
