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# v0.14
## Release v0.14.14 - 2017/03/23
### New features / Enhancements
* in_http: Support 'application/msgpack` header
https://github.com/fluent/fluentd/pull/1498
* in_udp: Add message_length_limit parameter for parameter name consistency with in_syslog
https://github.com/fluent/fluentd/pull/1515
* in_monitor_agent: Start one HTTP server per worker on sequential port numbers
https://github.com/fluent/fluentd/pull/1493
* in_tail: Skip the refresh of watching list on startup
https://github.com/fluent/fluentd/pull/1487
* filter_parser: filter_parser: Add emit_invalid_record_to_error parameter
https://github.com/fluent/fluentd/pull/1494
* parser_syslog: Support RFC5424 syslog format
https://github.com/fluent/fluentd/pull/1492
* parser: Allow escape sequence in Apache access log
https://github.com/fluent/fluentd/pull/1479
* config: Add actual value in the placholder error message
https://github.com/fluent/fluentd/pull/1497
* log: Add Fluent::Log#<< to support some SDKs
https://github.com/fluent/fluentd/pull/1478
### Bug fixes
* Fix cleanup resource
https://github.com/fluent/fluentd/pull/1483
* config: Set encoding forcefully to avoid UndefinedConversionError
https://github.com/fluent/fluentd/pull/1477
* Fix Input and Output deadlock when buffer is full during startup
https://github.com/fluent/fluentd/pull/1502
* config: Fix log_level handling in <system>
https://github.com/fluent/fluentd/pull/1501
* Fix typo in root agent error log
https://github.com/fluent/fluentd/pull/1491
* storage: Fix a bug storage_create cannot accept hash as `conf` keyword argument
https://github.com/fluent/fluentd/pull/1482
## Release v0.14.13 - 2017/02/17
### New features / Enhancements
* in_tail: Add 'limit_recently_modified' to limit watch files.
https://github.com/fluent/fluentd/pull/1474
* configuration: Improve 'flush_interval' handling for better message and backward compatibility
https://github.com/fluent/fluentd/pull/1442
* command: Add 'fluent-plugin-generate' command
https://github.com/fluent/fluentd/pull/1427
* output: Skip record when 'Output#format' returns nil
https://github.com/fluent/fluentd/pull/1469
### Bug fixes
* output: Secondary calculation should consider 'retry_max_times'
https://github.com/fluent/fluentd/pull/1452
* Fix regression of deprecatd 'process' module
https://github.com/fluent/fluentd/pull/1443
* Fix missing parser_regex require
https://github.com/fluent/fluentd/issues/1458
https://github.com/fluent/fluentd/pull/1453
* Keep 'Fluent::BufferQueueLimitError' for exsting plugins
https://github.com/fluent/fluentd/pull/1456
* in_tail: Untracked files should be removed from watching list to avoid memory bloat
https://github.com/fluent/fluentd/pull/1467
* in_tail: directories should be skipped when the ** pattern is used
https://github.com/fluent/fluentd/pull/1464
* record_transformer: Revert "Use BasicObject for cleanroom" for `enable_ruby` regression.
https://github.com/fluent/fluentd/pull/1461
* buf_file: handle "Too many open files" error to keep buffer and metadata pair
https://github.com/fluent/fluentd/pull/1468
## Release v0.14.12 - 2017/01/30
### New features / Enhancements
* Support multi process workers by `workers` option
https://github.com/fluent/fluentd/pull/1386
* Support TLS transport security layer by server plugin helper, and forward input/output plugins
https://github.com/fluent/fluentd/pull/1423
* Update internal log event handling to route log events to `@FLUENT_LOG` label if configured, suppress log events in startup/shutdown in default
https://github.com/fluent/fluentd/pull/1405
* Rename buffer plugin chunk limit parameters for consistency
https://github.com/fluent/fluentd/pull/1412
* Encode string values from configuration files in UTF8
https://github.com/fluent/fluentd/pull/1411
* Reorder plugin load paths to load rubygem plugins earlier than built-in plugins to overwrite them
https://github.com/fluent/fluentd/pull/1410
* Clock API to control internal thread control
https://github.com/fluent/fluentd/pull/1425
* Validate `config_param` options to restrict unexpected specifications
https://github.com/fluent/fluentd/pull/1437
* formatter: Add `add_newline` option to get formatted lines without newlines
https://github.com/fluent/fluentd/pull/1420
* in_forward: Add `ignore_network_errors_at_startup` option for automated cluster deployment
https://github.com/fluent/fluentd/pull/1399
* in_forward: Close listening socket in #stop, not to accept new connection request in early stage of shutdown
https://github.com/fluent/fluentd/pull/1401
* out_forward: Ensure to pack values in `str` type of msgpack
https://github.com/fluent/fluentd/pull/1413
* in_tail: Add `emit_unmatched_lines` to capture lines which unmatch configured regular expressions
https://github.com/fluent/fluentd/pull/1421
* in_tail: Add `open_on_every_update` to read lines from files opened in exclusive mode on Windows platform
https://github.com/fluent/fluentd/pull/1409
* in_monitor_agent: Add `with_ivars` query parameter to get instance variables only for specified instance variables
https://github.com/fluent/fluentd/pull/1393
* storage_local: Generate file store path using `usage`, with `root_dir` configuration
https://github.com/fluent/fluentd/pull/1438
* Improve test stability
https://github.com/fluent/fluentd/pull/1426
### Bug fixes
* Fix bug to ignore command line options: `--rpc-endpoint`, `--suppress-config-dump`, etc
https://github.com/fluent/fluentd/pull/1398
* Fix bug to block infinitely in shutdown when buffer is full and `overflow_action` is `block`
https://github.com/fluent/fluentd/pull/1396
* buf_file: Fix bug not to use `root_dir` even if configured correctly
https://github.com/fluent/fluentd/pull/1417
* filter_record_transformer: Fix to use BasicObject for clean room
https://github.com/fluent/fluentd/pull/1415
* filter_record_transformer: Fix bug that `remove_keys` doesn't work with `renew_time_key`
https://github.com/fluent/fluentd/pull/1433
* in_monitor_agent: Fix bug to crash with NoMethodError for some output plugins
https://github.com/fluent/fluentd/pull/1365
## Release v0.14.11 - 2016/12/26
### New features / Enhancements
* Add "root_dir" parameter in <system> directive to configure server root directory, used for buffer/storage paths
https://github.com/fluent/fluentd/pull/1374
* Fix not to restart Fluentd processes when unrecoverable errors occur
https://github.com/fluent/fluentd/pull/1359
* Show warnings in log when output flush operation takes longer time than threshold
https://github.com/fluent/fluentd/pull/1370
* formatter_csv: Raise configuration error when no field names are specified
https://github.com/fluent/fluentd/pull/1369
* in_syslog: Update implementation to use plugin helpers
https://github.com/fluent/fluentd/pull/1382
* in_forward: Add a configuration parameter "source_address_key"
https://github.com/fluent/fluentd/pull/1382
* in_monitor_agent: Add a parameter "include_retry" to get detail retry status
https://github.com/fluent/fluentd/pull/1387
* Add Ruby 2.4 into supported ruby versions
### Bug fixes
* Fix to set process name of supervisor process
https://github.com/fluent/fluentd/pull/1380
* in_forward: Fix a bug not to handle "require_ack_response" correctly
https://github.com/fluent/fluentd/pull/1389
## Release v0.14.10 - 2016/12/14
### New features / Enhancement
* Add socket/server plugin helper to write TCP/UDP clients/servers as Fluentd plugin
https://github.com/fluent/fluentd/pull/1312
https://github.com/fluent/fluentd/pull/1350
https://github.com/fluent/fluentd/pull/1356
https://github.com/fluent/fluentd/pull/1362
* Fix to raise errors when injected hostname is also specified as chunk key
https://github.com/fluent/fluentd/pull/1357
* in_tail: Optimize to read lines from file
https://github.com/fluent/fluentd/pull/1325
* in_monitor_agent: Add new parameter "include_config"(default: true)
https://github.com/fluent/fluentd/pull/1317
* in_syslog: Add "priority_key" and "facility_key" options
https://github.com/fluent/fluentd/pull/1351
* filter_record_transformer: Remove obsoleted syntax like "${message}" and not to dump records in logs
https://github.com/fluent/fluentd/pull/1328
* Add an option "--time-as-integer" to fluent-cat command to send events from v0.14 fluent-cat to v0.12 fluentd
https://github.com/fluent/fluentd/pull/1349
### Bug fixes
* Specify correct Oj options for newer versions (Oj 2.18.0 or later)
https://github.com/fluent/fluentd/pull/1331
* TimeSlice output plugins (in v0.12 style) raise errors when "utc" parameter is specified
https://github.com/fluent/fluentd/pull/1319
* Parser plugins cannot use options for regular expressions
https://github.com/fluent/fluentd/pull/1326
* Fix bugs not to raise errors to use logger in v0.12 plugins
https://github.com/fluent/fluentd/pull/1344
https://github.com/fluent/fluentd/pull/1332
* Fix bug about shutting down Fluentd in Windows
https://github.com/fluent/fluentd/pull/1367
* in_tail: Close files explicitly in tests
https://github.com/fluent/fluentd/pull/1327
* out_forward: Fix bug not to convert buffer configurations into v0.14 parameters
https://github.com/fluent/fluentd/pull/1337
* out_forward: Fix bug to raise error when "expire_dns_cache" is specified
https://github.com/fluent/fluentd/pull/1346
* out_file: Fix bug to raise error about buffer chunking when it's configured as secondary
https://github.com/fluent/fluentd/pull/1338
## Release v0.14.9 - 2016/11/15
### New features / Enhancement
* filter_parser: Port fluent-plugin-parser into built-in plugin
https://github.com/fluent/fluentd/pull/1191
* parser/formatter plugin helpers with default @type in plugin side
https://github.com/fluent/fluentd/pull/1267
* parser: Reconstruct Parser related classes
https://github.com/fluent/fluentd/pull/1286
* filter_record_transformer: Remove old behaviours
https://github.com/fluent/fluentd/pull/1311
* Migrate some built-in plugins into v0.14 API
https://github.com/fluent/fluentd/pull/1257 (out_file)
https://github.com/fluent/fluentd/pull/1297 (out_exec, out_exec_filter)
https://github.com/fluent/fluentd/pull/1306 (in_forward, out_forward)
https://github.com/fluent/fluentd/pull/1308 (in_http)
* test: Improve test drivers
https://github.com/fluent/fluentd/pull/1302
https://github.com/fluent/fluentd/pull/1305
### Bug fixes
* log: Avoid name conflict between Fluent::Logger
https://github.com/fluent/fluentd/pull/1274
* fluent-cat: Fix fluent-cat command to send sub-second precision time
https://github.com/fluent/fluentd/pull/1277
* config: Fix a bug not to overwrite default value with nil
https://github.com/fluent/fluentd/pull/1296
* output: Fix timezone for compat timesliced output plugins
https://github.com/fluent/fluentd/pull/1307
* out_forward: fix not to raise error when out_forward is initialized as secondary
https://github.com/fluent/fluentd/pull/1313
* output: Event router for secondary output
https://github.com/fluent/fluentd/pull/1283
* test: fix to return the block value as expected by many rubyists
https://github.com/fluent/fluentd/pull/1284
## Release v0.14.8 - 2016/10/13
### Bug fixes
* Add msgpack_each to buffer chunks in compat-layer output plugins
https://github.com/fluent/fluentd/pull/1273
## Release v0.14.7 - 2016/10/07
### New features / Enhancement
* Support data compression in buffer plugins
https://github.com/fluent/fluentd/pull/1172
* in_forward: support to transfer compressed data
https://github.com/fluent/fluentd/pull/1179
* out_stdout: fix to show nanosecond resolution time
https://github.com/fluent/fluentd/pull/1249
* Add option to rotate Fluentd daemon's log
https://github.com/fluent/fluentd/pull/1235
* Add extract plugin helper, with symmetric time parameter support in parser/formatter and inject/extract
https://github.com/fluent/fluentd/pull/1207
* Add a feature to parse/format numeric time (unix time [+ subsecond value])
https://github.com/fluent/fluentd/pull/1254
* Raise configuration errors for inconsistent <label> configurations
https://github.com/fluent/fluentd/pull/1233
* Fix to instantiate an unconfigured section even for multi: true
https://github.com/fluent/fluentd/pull/1210
* Add validators of placeholders for buffering key extraction
https://github.com/fluent/fluentd/pull/1255
* Fix to show log messages about filter optimization only when needed
https://github.com/fluent/fluentd/pull/1227
* Add some features to write plugins more easily
https://github.com/fluent/fluentd/pull/1256
* Add a tool to load dumped events from file
https://github.com/fluent/fluentd/pull/1165
### Bug fixes
* Fix Oj's default option to encode/decode JSON in the same way with Yajl
https://github.com/fluent/fluentd/pull/1147
https://github.com/fluent/fluentd/pull/1239
* Fix to raise correct configuration errors
https://github.com/fluent/fluentd/pull/1223
* Fix a bug to call `shutdown` method (and some others) twice
https://github.com/fluent/fluentd/pull/1242
* Fix to enable `chunk.each` only when it's encoded by msgpack
https://github.com/fluent/fluentd/pull/1263
* Fix a bug not to stop enqueue/flush threads correctly
https://github.com/fluent/fluentd/pull/1264
* out_forward: fix a bug that UDP heartbeat doesn't work
https://github.com/fluent/fluentd/pull/1238
* out_file: fix a crash bug when v0.14 enables symlink and resumes existing buffer file chunk generated by v0.12
https://github.com/fluent/fluentd/pull/1234
* in_monitor_agent: fix compatibility problem between outputs of v0.12 and v0.14
https://github.com/fluent/fluentd/pull/1232
* in_tail: fix a bug to crash to read large amount logs
https://github.com/fluent/fluentd/pull/1259
https://github.com/fluent/fluentd/pull/1261
## Release v0.14.6 - 2016/09/07
### Bug fixes
* in_tail: Add a missing parser_multiline require
https://github.com/fluent/fluentd/pull/1212
* forward: Mark secret parameters of forward plugins as secret
https://github.com/fluent/fluentd/pull/1209
## Release v0.14.5 - 2016/09/06
### New features / Enhancement
* Add authentication / authorization feature to forward protocol and in/out_forward plugins
https://github.com/fluent/fluentd/pull/1136
* Add a new plugin to dump buffers in retries as secondary plugin
https://github.com/fluent/fluentd/pull/1154
* Merge out_buffered_stdout and out_buffered_null into out_stdout and out_null
https://github.com/fluent/fluentd/pull/1200
### Bug fixes
* Raise configuration errors to clearify what's wrong when "@type" is missing
https://github.com/fluent/fluentd/pull/1202
* Fix the bug not to launch Fluentd when v0.12 MultiOutput plugin is configured
https://github.com/fluent/fluentd/pull/1206
## Release v0.14.4 - 2016/08/31
### New features / Enhancement
* Add a method to Filter API to update time of events
https://github.com/fluent/fluentd/pull/1140
* Improve performance of filter pipeline
https://github.com/fluent/fluentd/pull/1145
* Fix to suppress not to warn about different plugins for primary and secondary without any problems
https://github.com/fluent/fluentd/pull/1153
* Add deprecated/obsoleted options to config_param to show removed/warned parameters
https://github.com/fluent/fluentd/pull/1186
* in_forward: Add a feature source_hostname_key to inject source hostname into records
https://github.com/fluent/fluentd/pull/807
* in_tail: Add a feature from_encoding to specify both encoding from and to
https://github.com/fluent/fluentd/pull/1067
* filter_record_transformer: Fix to prevent overwriting reserved placeholder keys
https://github.com/fluent/fluentd/pull/1176
* Migrate some build-in plugins into v0.14 API
https://github.com/fluent/fluentd/pull/1149
https://github.com/fluent/fluentd/pull/1151
* Update dependencies
https://github.com/fluent/fluentd/pull/1193
### Bug fixes
* Fix to start/stop/restart Fluentd processes correctly on Windows environment
https://github.com/fluent/fluentd/pull/1171
https://github.com/fluent/fluentd/pull/1192
* Fix to handle Windows events correctly in winsvc.rb
https://github.com/fluent/fluentd/pull/1155
https://github.com/fluent/fluentd/pull/1170
* Fix not to continue to restart workers for configuration errors
https://github.com/fluent/fluentd/pull/1183
* Fix output threads to start enqueue/flush buffers until plugins' start method ends
https://github.com/fluent/fluentd/pull/1190
* Fix a bug not to set umask 0
https://github.com/fluent/fluentd/pull/1152
* Fix resource leak on one-shot timers
https://github.com/fluent/fluentd/pull/1178
* Fix to call plugin helper methods in configure
https://github.com/fluent/fluentd/pull/1184
* Fix a bug to count event size
https://github.com/fluent/fluentd/pull/1164/files
* Fix to require missed compat modules
https://github.com/fluent/fluentd/pull/1168
* Fix to start properly for plugins under MultiOutput
https://github.com/fluent/fluentd/pull/1167
* Fix test drivers to set class name into plugin instances
https://github.com/fluent/fluentd/pull/1069
* Fix tests not to use mocks for Time (improve test stabilization)
https://github.com/fluent/fluentd/pull/1194
## Release 0.14.3 - 2016/08/30
* Fix the dependency for ServerEngine 1.x
## Release 0.14.2 - 2016/08/09
### New features / Enhancement
* Fix to split large event stream into some/many chunks in buffers
https://github.com/fluent/fluentd/pull/1062
* Add parser and filter support in compat_parameters plugin helper
https://github.com/fluent/fluentd/pull/1079
* Add a RPC call to flush buffers and stop workers
https://github.com/fluent/fluentd/pull/1134
* Update forward protocol to pass the number of events in a payload
https://github.com/fluent/fluentd/pull/1137
* Improve performance of some built-in formatter plugins
https://github.com/fluent/fluentd/pull/1082
https://github.com/fluent/fluentd/pull/1086
* Migrate some built-in plugins and plugin util modules into v0.14 API
https://github.com/fluent/fluentd/pull/1058
https://github.com/fluent/fluentd/pull/1061
https://github.com/fluent/fluentd/pull/1076
https://github.com/fluent/fluentd/pull/1078
https://github.com/fluent/fluentd/pull/1081
https://github.com/fluent/fluentd/pull/1083
https://github.com/fluent/fluentd/pull/1091
* Register RegExpParser as a parser plugin explicitly
https://github.com/fluent/fluentd/pull/1094
* Add delimiter option to CSV parser
https://github.com/fluent/fluentd/pull/1108
* Add an option to receive longer udp syslog messages
https://github.com/fluent/fluentd/pull/1127
* Add a option to suspend internal status in dummy plugin
https://github.com/fluent/fluentd/pull/900
* Add a feature to capture filtered records in test driver for Filter plugins
https://github.com/fluent/fluentd/pull/1077
* Add some utility methods to plugin test drivers
https://github.com/fluent/fluentd/pull/1114
### Bug fixes
* Fix bug to read non buffer-chunk files as buffer chunks when Fluentd resumed
https://github.com/fluent/fluentd/pull/1124
* Fix bug not to load Filter plugins which are specified in configurations
https://github.com/fluent/fluentd/pull/1118
* Fix bug to ignore `-p` option to specify directories of plugins
https://github.com/fluent/fluentd/pull/1133
* Fix bug to overwrite base class configuration section definitions by subclasses
https://github.com/fluent/fluentd/pull/1119
* Fix to stop Fluentd worker process by Ctrl-C when --no-supervisor specified
https://github.com/fluent/fluentd/pull/1089
* Fix regression about RPC call to reload configuration
https://github.com/fluent/fluentd/pull/1093
* Specify to ensure Oj JSON parser to use strict mode
https://github.com/fluent/fluentd/pull/1147
* Fix unexisting path handling in Windows environment
https://github.com/fluent/fluentd/pull/1104
## Release 0.14.1 - 2016/06/30
### New features / Enhancement
* Add plugin helpers for parsers and formatters
https://github.com/fluent/fluentd/pull/1023
* Extract some mixins into compat modules
https://github.com/fluent/fluentd/pull/1044
https://github.com/fluent/fluentd/pull/1052
* Add utility methods for tests and test drivers
https://github.com/fluent/fluentd/pull/1047
* Migrate some built-in plugins to v0.14 APIs
https://github.com/fluent/fluentd/pull/1049
https://github.com/fluent/fluentd/pull/1057
https://github.com/fluent/fluentd/pull/1060
https://github.com/fluent/fluentd/pull/1064
* Add support of X-Forwarded-For header in in_http plugin
https://github.com/fluent/fluentd/pull/1051
* Warn not to create too many staged chunks at configure
https://github.com/fluent/fluentd/pull/1054
* Add a plugin helper to inject tag/time/hostname
https://github.com/fluent/fluentd/pull/1063
### Bug fixes
* Fix in_monitor_agent for v0.14 plugins
https://github.com/fluent/fluentd/pull/1003
* Fix to call #format_stream of plugins themselves when RecordFilter mixin included
https://github.com/fluent/fluentd/pull/1005
* Fix shutdown sequence to wait force flush
https://github.com/fluent/fluentd/pull/1009
* Fix a deadlock bug in shutdown
https://github.com/fluent/fluentd/pull/1010
* Fix to require DetachProcessMixin in default for compat plugins
https://github.com/fluent/fluentd/pull/1014
* Fix to overwrite configure_proxy name only for root sections for debugging
https://github.com/fluent/fluentd/pull/1015
* Rename file for in_unix plugin
https://github.com/fluent/fluentd/pull/1017
* Fix a bug not to create pid file when daemonized
https://github.com/fluent/fluentd/pull/1021
* Fix wrong DEFAULT_PLUGIN_PATH
https://github.com/fluent/fluentd/pull/1028
* Fix a bug not to use primary plugin type for secondary in default
https://github.com/fluent/fluentd/pull/1032
* Add --run-worker option to distinguish to run as worker without supervisor
https://github.com/fluent/fluentd/pull/1033
* Fix regression of fluent-debug command
https://github.com/fluent/fluentd/pull/1046
* Update windows-pr dependency to 1.2.5
https://github.com/fluent/fluentd/pull/1065
* Fix supervisor to pass RUBYOPT to worker processes
https://github.com/fluent/fluentd/pull/1066
## Release 0.14.0 - 2016/05/25
### New features / Enhancement
This list includes changes of 0.14.0.pre.1 and release candidates.
* Update supported Ruby version to 2.1 or later
https://github.com/fluent/fluentd/pull/692
* Sub-second event time support
https://github.com/fluent/fluentd/pull/653
* Windows support and supervisor improvement
https://github.com/fluent/fluentd/pull/674
https://github.com/fluent/fluentd/pull/831
https://github.com/fluent/fluentd/pull/880
* Add New plugin API
https://github.com/fluent/fluentd/pull/800
https://github.com/fluent/fluentd/pull/843
https://github.com/fluent/fluentd/pull/866
https://github.com/fluent/fluentd/pull/905
https://github.com/fluent/fluentd/pull/906
https://github.com/fluent/fluentd/pull/917
https://github.com/fluent/fluentd/pull/928
https://github.com/fluent/fluentd/pull/943
https://github.com/fluent/fluentd/pull/964
https://github.com/fluent/fluentd/pull/965
https://github.com/fluent/fluentd/pull/972
https://github.com/fluent/fluentd/pull/983
* Add standard chunking format
https://github.com/fluent/fluentd/pull/914
* Add Compatibility layer for v0.12 plugins
https://github.com/fluent/fluentd/pull/912
https://github.com/fluent/fluentd/pull/969
https://github.com/fluent/fluentd/pull/974
https://github.com/fluent/fluentd/pull/992
https://github.com/fluent/fluentd/pull/999
* Add Plugin Storage API
https://github.com/fluent/fluentd/pull/864
https://github.com/fluent/fluentd/pull/910
* Enforce to use router.emit instead of Engine.emit
https://github.com/fluent/fluentd/pull/883
* log: Show plugin name and id in logs
https://github.com/fluent/fluentd/pull/860
* log: Dump configurations with v1 syntax in logs
https://github.com/fluent/fluentd/pull/867
* log: Dump errors with class in logs
https://github.com/fluent/fluentd/pull/899
* config: Add simplified syntax for configuration values of hash and array
https://github.com/fluent/fluentd/pull/875
* config: Add 'init' option to config_section to initialize section objects
https://github.com/fluent/fluentd/pull/877
* config: Support multiline string in quoted strings
https://github.com/fluent/fluentd/pull/929
* config: Add optional arguments on Element#elements to select child elements
https://github.com/fluent/fluentd/pull/948
* config: Show deprecated warnings for reserved parameters
https://github.com/fluent/fluentd/pull/971
* config: Make the detach process forward interval configurable
https://github.com/fluent/fluentd/pull/982
* in_tail: Add 'path_key' option to inject tailing path
https://github.com/fluent/fluentd/pull/951
* Remove in_status plugin
https://github.com/fluent/fluentd/pull/690
### Bug fixes
* config: Enum list must be of symbols
https://github.com/fluent/fluentd/pull/821
* config: Fix to dup values in default
https://github.com/fluent/fluentd/pull/827
* config: Fix problems about overwriting subsections
https://github.com/fluent/fluentd/pull/844
https://github.com/fluent/fluentd/pull/981
* log: Serialize Fluent::EventTime as Integer in JSON
https://github.com/fluent/fluentd/pull/904
* out_forward: Add missing error class and tests for it
https://github.com/fluent/fluentd/pull/922
### Internal fix / Refactoring
* Fix dependencies between files
https://github.com/fluent/fluentd/pull/799
https://github.com/fluent/fluentd/pull/808
https://github.com/fluent/fluentd/pull/823
https://github.com/fluent/fluentd/pull/824
https://github.com/fluent/fluentd/pull/825
https://github.com/fluent/fluentd/pull/826
https://github.com/fluent/fluentd/pull/828
https://github.com/fluent/fluentd/pull/859
https://github.com/fluent/fluentd/pull/892
* Separate PluginId from config
https://github.com/fluent/fluentd/pull/832
* Separate MessagePack factory from Engine
https://github.com/fluent/fluentd/pull/871
* Register plugins to registry
https://github.com/fluent/fluentd/pull/838
* Move TypeConverter mixin to mixin.rb
https://github.com/fluent/fluentd/pull/842
* Override default configurations by <system>
https://github.com/fluent/fluentd/pull/854
* Suppress Ruby level warnings
https://github.com/fluent/fluentd/pull/846
https://github.com/fluent/fluentd/pull/852
https://github.com/fluent/fluentd/pull/890
https://github.com/fluent/fluentd/pull/946
https://github.com/fluent/fluentd/pull/955
https://github.com/fluent/fluentd/pull/966
See https://github.com/fluent/fluentd/blob/v0.12/ChangeLog for v0.12 changelog