Release Fluentd v1.18.0 · fluent/fluentd

Full Changelog: v1.17.1...v1.18.0

#4624 Add zero-downtime-restart feature for non-Windows
#4661 Add with-source-only feature
- fluentd command: Add --with-source-only option
- System configuration: Add with_source_only option
#4661 Embedded plugin: Add out_buffer plugin, which can be used for buffering and relabeling events
#4580 Config File Syntax: Extend Embedded Ruby Code support for Hashes and Arrays
- Example: key {"foo":"#{1 + 1}"} => key {"foo":"2"}
- Please note that this is not backward compatible, although we assume that this will never affect to actual existing configs.
- In case the behavior changes unintentionally, you can disable this feature by surrounding the entire value with single quotes.
  - key '{"foo":"#{1 + 1}"}' => key {"foo":"#{1 + 1}"}
#4718 transport tls: Use SSL_VERIFY_NONE by default
#4720 transport tls: Add ensure_fips option to ensure FIPS compliant mode
#4649 plugin_helper/server: Add receive_buffer_size parameter in transport section
#4620 filter_parser: Now able to handle multiple parsed results
#4655 in_http: add add_tag_prefix option
#4604 System configuration: add path option in log section

#4716 command: fix NoMethodError of --daemon under Windows
#4605 fluentd command: fix --plugin (-p) option not to overwrite default value

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