# Observed pre-existing intermittent tracker race

This file records an unrelated timing observation and its repeated reproduction;
it is **not** a DGR-001 benchmark/contract failure.

Test:

```text
tests/test_tracker_routing.py::test_tracker_dashboard_can_cancel_inflight_proxy
```

One earlier full-suite run produced:

```text
1 failed, 745 passed, 13 skipped
```

A five-run isolated retry matrix reproduced the same rate repeatedly:

```text
current DGR-001 branch: 4/5 passed, 1/5 failed
clean d904c40:          4/5 passed, 1/5 failed
```

An earlier full-suite run on the signed-provenance DGR-001 state completed
green:

```text
751 passed, 13 skipped
```

Two full-suite runs after adding the isolated GPU diagnostic profile each hit
the same race and otherwise passed:

```text
1 failed, 750 passed, 13 skipped
```

The latest expanded hardening suite hit the same race and otherwise passed:

```text
1 failed, 754 passed, 13 skipped
```

The final hardened state subsequently completed a full green run:

```text
755 passed, 13 skipped
```

In each failure, the mock upstream's three-second release timeout completed the
stream before the cancel POST, so the request was already absent and the cancel
endpoint returned 404. No tracker/proxy file changed in DGR-001. The race is
therefore timing-sensitive, pre-existing, and unrelated to the benchmark,
provenance, or GPU-diagnostic code.