> ## Documentation Index > Fetch the complete documentation index at: https://docs.honeycomb.io/llms.txt > Use this file to discover all available pages before exploring further. # Honeycomb Dataset Fields > Reference Honeycomb's standard dataset fields by dataset type. To get the most out of Honeycomb visualizations, you will need to map some of the source fields in your sent data to Honeycomb-specific standard dataset fields. Different dataset fields are available depending on the type of dataset you are sending to Honeycomb. ## Trace Datasets Honeycomb will identify a dataset as a trace dataset, if you either: * send a source field named `trace.trace_id` to Honeycomb, or * [manually map](/send-data/standardize/map-data/) a source field to the **Trace ID** dataset field in the dataset's Dataset Definitions. ### Available Fields You can map the following dataset fields for a trace dataset: To allow Honeycomb to detect and map dataset fields automatically, name the data field you send to Honeycomb the value listed in the **Source Field Name** column. To learn how to map dataset fields manually, visit [Map Data](/send-data/standardize/map-data/). | Dataset Field | Description | Allowed Type(s) | Source Field Name | Can Group By? | | ----------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------- | ----------------------------- | ------------- | | **Error** | Value that indicates an error occurred. Used to identify errors when calculating the "Total Spans with Errors" visualizations. | boolean, string, [calculated field](/configure/environments/calculated-fields/) | `error` | Yes | | **HTTP Status Code** | Code that indicates the success, failure, or other status of a request. | string, integer, float, [calculated field](/configure/environments/calculated-fields/) | `response.status_code` | Yes | | **Metadata: Annotation Type** | Type of the span annotation, which controls how Honeycomb visualizes this event in a trace. Possible values include `span_event` (indicates the span is a [span event](/send-data/standardize/add-context/#attach-context-at-a-particular-moment-in-time)) and `link` (indicates the span is a [span link](/send-data/standardize/add-context/#establish-relationships-between-spans-in-different-trace-hierarchies)). | string, [calculated field](/configure/environments/calculated-fields/) | `meta.annotation_type` | No | | **Metadata: Link Span ID** | Unique ID of the span you want to link to the current span. Indicates the span is a span event. Use with **Metadata: Link Trace ID**. | string, [calculated field](/configure/environments/calculated-fields/) | `trace.link.span_id` | No | | **Metadata: Link Trace ID** | Unique ID of the trace you want to link to the current span. Use with **Metadata: Link Span ID**. | string, [calculated field](/configure/environments/calculated-fields/) | `trace.link.trace_id` | No | | **Name** | Name of the function or method in which the span was created. | string, [calculated field](/configure/environments/calculated-fields/) | `name` | Yes | | **Parent span ID** | ID of the span's parent span, which is the location from which the span was called. | string, [calculated field](/configure/environments/calculated-fields/) | `parent_id` | No | | **Route** | HTTP URL or equivalent route processed by the request. | string, [calculated field](/configure/environments/calculated-fields/) | Not automatically mapped | Yes | | **Service name** | Name of the instrumented service. | string, [calculated field](/configure/environments/calculated-fields/) | `service.name` | No | | **Span duration** | Length of time the span took in milliseconds (ms). Used to calculate the "95th Percentile Latency" visualizations. | float, integer, [calculated field](/configure/environments/calculated-fields/) | `duration_ms` or `durationMs` | No | | **Span ID** | Unique ID of the span. | string, [calculated field](/configure/environments/calculated-fields/) | `span_id` | No | | **Trace ID** | Unique ID of the trace to which the span belongs. | string, [calculated field](/configure/environments/calculated-fields/) | `trace.trace_id` | No | | **User** | User making the request in the system. | float, string, integer, [calculated field](/configure/environments/calculated-fields/) | Not automatically mapped | Yes | ## Log Datasets For Honeycomb to identify a dataset as a logs dataset, either: * send a source field named `body` to Honeycomb, or * [manually map](/send-data/standardize/map-data/) a source field to the **Log Message** dataset field in the dataset's Dataset Definitions. ### Available Fields You can map the following dataset fields for a log dataset: To allow Honeycomb to detect and map dataset fields automatically, name the data field you send to Honeycomb the value listed in the **Source Field Name** column. To learn how to map dataset fields manually, visit [Map Data](/send-data/standardize/map-data/). | Dataset Field | Description | Allowed Type(s) | Source Field Name | | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------------------------------------------------- | ----------------- | | **Log Message** | Value containing the log event message. May be a human-readable string message (including multiline) describing the event in free form. | string, [calculated field](/configure/environments/calculated-fields/) | `body` | | **Log Severity** | Severity level of the event (also known as log level). Supported values include: `trace`, `debug`, `info`, `warn`, `error`, `fatal`, and `unspecified`. | string, [calculated field](/configure/environments/calculated-fields/) | `severity` |