> This page is for NeMo Relay, version dev.
> For other versions, use one of these documentation indexes:
> - Latest (v0.10.4) (default): https://docs.nvidia.com/nemo/relay/latest/llms.txt
> - dev: https://docs.nvidia.com/nemo/relay/dev/llms.txt
> - v0.11.0: https://docs.nvidia.com/nemo/relay/v0.11.0/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 Observation

> Typed observation with borrowed detail and shared caller correlation.

Generated from `cargo doc --no-deps -p nemo-relay -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`.

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Typed observation with borrowed detail and shared caller correlation.

## Fields

### `code: u32`

One-based code position returned by registration.

### `outcome: DiagnosticOutcome`

Observed outcome, checked against the declaration.

### `severity: DiagnosticSeverity`

Severity is independent of outcome.

### `failure_class: Option<FailureClass>`

Evidence-based cause, never inferred from text.

### `count: NonZeroU64`

Positive input delta, not an accumulated total.

### `detail: &'a str`

Restricted diagnostic-only detail; core reports any truncation.

### `correlation: DiagnosticCorrelation<'a>`

Optional request/session identifiers, excluded from aggregation keys.

## Implementations

### `impl<'a> Observation<'a>`

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#### `failure`

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Author a failed internal operation with error severity.

#### `success`

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Author independent successful evidence.