> 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
> - v0.10.4: 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.

# Module diagnostics

> Negotiated, bounded plugin diagnostic submission and delivery controls. Bounded diagnostic delivery, independent of execution and operational logs. Counters, history, and recording permission remain owned by the Relay host.

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`.

Negotiated, bounded plugin diagnostic submission and delivery controls. Bounded diagnostic delivery, independent of execution and operational logs. Counters, history, and recording permission remain owned by the Relay host.

## Structs

* [DiagnosticCodeDefinition](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-diagnosticcodedefinition)
* [DiagnosticComponent](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-diagnosticcomponent): Component-scoped authoring handle; code IDs are one-based registration positions.
* [DiagnosticDeliveryStats](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-diagnosticdeliverystats): SDK-local saturating delivery totals; never replayed as host observations.
* [DiagnosticExtensionDefinition](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-diagnosticextensiondefinition)
* [DiagnosticObservation](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-diagnosticobservation)
* [DiagnosticReceipt](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-diagnosticreceipt)
* [WorkerDiagnostics](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/struct-workerdiagnostics): One negotiated facade per activation. Disabled/unsupported facades are inert.

## Enums

* [DiagnosticDeliveryError](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/enum-diagnosticdeliveryerror): Delivery outcome, independent of plugin execution or health.
* [DiagnosticEvidenceRetention](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/enum-diagnosticevidenceretention)
* [DiagnosticObservationOutcome](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/enum-diagnosticobservationoutcome)
* [DiagnosticObservationSeverity](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/enum-diagnosticobservationseverity)
* [DiagnosticReceiptStatus](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/enum-diagnosticreceiptstatus)

## Functions

* [builtin_code](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/fn-builtin-code): Select a typed catalogue code without copying its spelling into plugin code.
* [extension_code](/reference/api/rust-library-reference/nemo-relay-worker/diagnostics/fn-extension-code): Define a bounded internal operation in the host-assigned session namespace.