IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Logging configuration migration

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Logging configuration migration

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Compatibility with the legacy logging system is assured until the end of the v7 version. All log messages handled by root context are forwarded to the legacy logging service. If you re-write root appenders, make sure that it contains default appender to provide backward compatibility.

When you switch to the new logging configuration, you will start seeing duplicate log entries in both formats. These will be removed when the default appender is no longer required. If you define an appender for a logger, the log messages aren’t handled by the root logger anymore and are not forwarded to the legacy logging service.

Parameter	Platform log record in pattern format	Legacy Platform log record text format
@timestamp	ISO8601_TZ `2012-01-31T23:33:22.011-05:00`	Absolute `23:33:22.011`
logger	`parent.child`	`['parent', 'child']`
level	`DEBUG`	`['debug']`
meta	stringified JSON object `{"to": "v8"}`	N/A
pid	can be configured as `%pid`	N/A

Parameter	Platform log record in json format	Legacy Platform log record json format
@timestamp	ISO8601_TZ `2012-01-31T23:33:22.011-05:00`	ISO8601 `2012-01-31T23:33:22.011Z`
logger	`log.logger: parent.child`	`tags: ['parent', 'child']`
level	`log.level: DEBUG`	`tags: ['debug']`
meta	merged in log record `{... "to": "v8"}`	merged in log record `{... "to": "v8"}`
pid	`process.pid: 12345`	`pid: 12345`
type	N/A	`type: log`
error	`{ message, name, stack }`	`{ message, name, stack, code, signal }`

Logging configuration via CLI

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As is the case for any of Kibana’s config settings, you can specify your logging configuration via the CLI. For convenience, the --verbose and --silent flags exist as shortcuts and will continue to be supported beyond v7.

If you wish to override these flags, you can always do so by passing your preferred logging configuration directly to the CLI. For example, with the following configuration:

logging:
  appenders:
    custom:
      type: console
      layout:
        type: pattern
        pattern: "[%date][%level] %message"

you can override the flags with:

legacy logging	Kibana Platform logging	cli shortcuts
--verbose	--logging.root.level=debug --logging.root.appenders[0]=default --logging.root.appenders[1]=custom	--verbose
--quiet	--logging.root.level=error --logging.root.appenders[0]=default --logging.root.appenders[1]=custom	not supported
--silent	--logging.root.level=off	--silent

To preserve backwards compatibility, you are required to pass the root default appender until the legacy logging system is removed in v8.0.

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