[[logging-config-changes]]
== Logging configuration changes

WARNING: {kib} 8.0.0 and later uses a new logging system. Before you upgrade, read the documentation for your {kib} version.

[[logging-pattern-format-old-and-new-example]]
[options="header"]
|===

| Parameter | Log record in **pattern** format | Legacy log record in **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

|===

[[logging-json-format-old-and-new-example]]
[options="header"]
|===

| Parameter | Log record in **json** format | Legacy 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 }`

|===