67 lines
2.0 KiB
Markdown
67 lines
2.0 KiB
Markdown
---
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id: PLN-0093
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ticket: vm-render-parallel-execution-boundary
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title: Add Render Telemetry Counters and Events
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status: done
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created: 2026-06-05
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ref_decisions: [DEC-0031]
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tags: [runtime, renderer, telemetry, diagnostics]
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---
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## Briefing
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`DEC-0031` requires render drops, repeats, stale discards, render errors, and present errors to be observable without becoming VM semantics.
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## Objective
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Add the minimum render telemetry surface required for asynchronous render diagnostics and certification.
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## Dependencies
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- Source decision: `DEC-0031`.
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- `PLN-0089` and `PLN-0092` provide main event sources.
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## Scope
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- Add minimum counters and last-frame IDs from `DEC-0031`.
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- Add event recording hooks for handoff, consume, present, repeat, stale discard, errors, and shutdown discard.
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- Expose telemetry through existing runtime/host diagnostics patterns.
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- Ensure VM program behavior cannot observe telemetry as render ACK.
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## Non-Goals
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- Do not build a UI profiler.
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- Do not add VM syscalls for present ACK.
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- Do not define host-specific logging formats beyond necessary hooks.
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## Execution Method
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1. Locate current telemetry facilities and atomic counter patterns.
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2. Add render telemetry structure with counters and last IDs.
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3. Wire replacement-before-consume from handoff.
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4. Wire consumed/presented/repeated from consumer path.
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5. Wire stale epoch and shutdown discards.
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6. Wire render/present error reporting.
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7. Add read-only diagnostics access for host/debug tooling.
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## Acceptance Criteria
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- All minimum counters and IDs from `DEC-0031` exist.
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- Latest-wins replacement is measurable.
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- Repeated presents and stale epoch discards are measurable.
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- Telemetry is not a blocking ACK path for the VM.
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## Tests
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- Unit tests for counter increments.
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- Handoff replacement telemetry test.
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- Stale epoch discard telemetry test.
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- Error path telemetry test where render/present errors can be simulated.
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## Affected Artifacts
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- Runtime telemetry modules.
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- `RenderManager`.
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- Render handoff and publication paths.
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- Host/debug telemetry readers.
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