> This page is for NeMo Relay, version dev.
> For other versions, use one of these documentation indexes:
> - Latest (v0.11.1) (default): https://docs.nvidia.com/nemo/relay/latest/llms.txt
> - dev: https://docs.nvidia.com/nemo/relay/dev/llms.txt
> - v0.11.1: https://docs.nvidia.com/nemo/relay/v0.11.1/llms.txt
> - v0.10.4: https://docs.nvidia.com/nemo/relay/v0.10.4/llms.txt
> - v0.9.4: https://docs.nvidia.com/nemo/relay/v0.9.4/llms.txt
> - v0.8.4: https://docs.nvidia.com/nemo/relay/v0.8.4/llms.txt
> - v0.7.3: https://docs.nvidia.com/nemo/relay/v0.7.3/llms.txt

> For clean Markdown of any page, append .md to the page URL.
> For a complete documentation index, see https://docs.nvidia.com/nemo/relay/llms.txt.
> For AI client integration (Claude Code, Cursor, etc.), connect to the MCP server at https://docs.nvidia.com/nemo/relay/_mcp/server.

# Struct Emit Mark Event Params

> Builder parameters for `event`.

Generated from `cargo doc --no-deps -p nemo-relay-builtins -p nemo-relay-diagnostics -p nemo-relay-logging -p nemo-relay-plugin-host -p nemo-relay-codecs -p nemo-relay -p nemo-relay-runtime -p nemo-relay-model-pricing -p nemo-relay-resource-metrics -p nemo-relay-observability -p nemo-relay-adaptive -p nemo-relay-pii-redaction -p nemo-relay-ffi -p nemo-relay-types -p nemo-relay-plugin -p nemo-relay-worker-proto -p nemo-relay-worker`.

<pre />

Builder parameters for [`event`](/reference/api/rust-library-reference/nemo-relay/scope/fn-event).

## Fields

### `name: &'a str`

Event name to emit.

### `parent: Option<&'a ScopeHandle>`

Optional explicit parent scope.

### `data: Option<Value>`

Optional JSON payload recorded as the mark data.

### `data_schema: Option<DataSchema>`

Optional schema identifier for the mark data.

### `metadata: Option<Value>`

Optional JSON metadata recorded on the emitted event.

### `severity: Option<LogSeverity>`

Optional typed log severity stored authoritatively in mark metadata.

### `category: Option<EventCategory>`

Optional semantic category for the mark.

### `category_profile: Option<CategoryProfile>`

Optional category-specific mark profile.

### `timestamp: Option<DateTime<Utc>>`

Optional timestamp recorded on the emitted mark event. When omitted, the current UTC time is used.

## Implementations

### `impl<'a> EmitMarkEventParams<'a>`

<pre />

#### `builder`

<pre />

Create a builder for building `EmitMarkEventParams`. On the builder, call `.name(...)`, `.parent(...)`(optional), `.data(...)`(optional), `.data_schema(...)`(optional), `.metadata(...)`(optional), `.severity(...)`(optional), `.category(...)`(optional), `.category_profile(...)`(optional), `.timestamp(...)`(optional) to set the values of the fields. Finally, call `.build()` to create the instance of `EmitMarkEventParams`.