| Timestamp | timestamp | core | timestamp | Time the log event was recorded (e.g., 2025-10-02T09:36:04Z). Applies to: all. |
| Host | host | core | string | The name of the originating host as defined in metrics (e.g., i-0123456789abcdef0). Applies to: all. |
| Source | source | core | string | Integration name, the technology from which data originated (e.g., nginx, postgresql). Applies to: all. |
| Service | service | core | string | The unified service name for the application or service generating data (e.g., web-api). Applies to: all. |
| Status | status | core | string | Level or severity of the log (e.g., info, warn, error). Applies to: all. |
| Message | message | core | string | Body of the log entry; indexed for full-text search by default. Applies to: all. |
| Trace ID | trace_id | core | string | Used for traces and correlate with other data, including APM traces. Applies to: all. |
| Client IP | @network.client.ip | event_attribute | string | IP address of the client that initiated the connection (e.g., 192.168.1.100). Applies to: network logs. |
| Client Port | @network.client.port | event_attribute | int64 | Port used by the client connection (e.g., 51402). Applies to: network logs. |
| Destination IP | @network.destination.ip | event_attribute | string | IP address of the destination (e.g., 10.0.0.1). Applies to: network logs. |
| Destination Port | @network.destination.port | event_attribute | int64 | Port of the destination (e.g., 443). Applies to: network logs. |
| Client Country | @network.client.geoip.country.name | event_attribute | string | Country name derived from client IP geolocation (e.g., United States). Applies to: network logs. |
| Client Country Code | @network.client.geoip.country.iso_code | event_attribute | string | ISO country code derived from client IP (e.g., US). Applies to: network logs. |
| Client City | @network.client.geoip.city.name | event_attribute | string | City name derived from client IP geolocation (e.g., San Francisco). Applies to: network logs. |
| HTTP Method | @http.method | event_attribute | string | HTTP method used in the request (e.g., GET, POST, PUT). Applies to: HTTP logs. |
| HTTP Status Code | @http.status_code | event_attribute | int64 | HTTP response status code (e.g., 200, 404, 500). Applies to: HTTP logs. |
| HTTP URL | @http.url | event_attribute | string | Full URL of the HTTP request (e.g., https://example.com/api/v1/users). Applies to: HTTP logs. |
| HTTP User Agent | @http.useragent | event_attribute | string | User agent string from the HTTP request (e.g., Mozilla/5.0...). Applies to: HTTP logs. |
| URL Host | @http.url_details.host | event_attribute | string | Parsed host from the URL (e.g., example.com). Applies to: HTTP logs. |
| URL Path | @http.url_details.path | event_attribute | string | Parsed path from the URL (e.g., /api/v1/users). Applies to: HTTP logs. |
| Error Kind | @error.kind | event_attribute | string | The type or class of the error (e.g., RuntimeError, NullPointerException). Applies to: error logs. |
| Error Message | @error.message | event_attribute | string | Concise, human-readable description of the error (e.g., Connection refused). Applies to: error logs. |
| Error Stack Trace | @error.stack | event_attribute | string | Stack trace or traceback for the error. Applies to: error logs. |
| Logger Name | @logger.name | event_attribute | string | Name of the logger (e.g., com.example.MyClass). Applies to: all. |
| Thread Name | @logger.thread_name | event_attribute | string | Name of the current thread when logging (e.g., main, worker-1). Applies to: all. |
| Method Name | @logger.method_name | event_attribute | string | Name of the method where the log was generated. Applies to: all. |
| Database Instance | @db.instance | event_attribute | string | Database instance identifier (e.g., orders-db). Applies to: database logs. |
| Database Operation | @db.operation | event_attribute | string | Type of database operation performed (e.g., SELECT, INSERT). Applies to: database logs. |
| Database User | @db.user | event_attribute | string | Database user executing the operation. Applies to: database logs. |
| User ID | @usr.id | event_attribute | string | Unique identifier of the user (e.g., 12345). Applies to: all. |
| User Email | @usr.email | event_attribute | string | Email address of the user (e.g., user@example.com). Applies to: all. |
| User Name | @usr.name | event_attribute | string | Full name or display name of the user. Applies to: all. |
| Duration | @duration | event_attribute | int64 | Duration of the operation in nanoseconds (e.g., 1500000). Applies to: all. |
| Syslog Hostname | @syslog.hostname | event_attribute | string | Hostname from syslog message. Applies to: syslog. |
| Syslog Severity | @syslog.severity | event_attribute | int64 | Syslog severity level (0-7). Applies to: syslog. |
| Syslog Facility | @syslog.facility | event_attribute | int64 | Syslog facility code. Applies to: syslog. |