fix(agentx): allow sparse low-concurrency profile tails

docs/benchmark-modes/semianalysis-agentx-faq.md

@@ -837,9 +837,9 @@ the failed and total request counts, observed failure percentage, configured lim
 operator to the inference-server logs.
 
 For profiling phases that meet the AgentX scenario's minimum valid duration, the scenario also
-requires TTFT or inter-token-latency observations to extend through at least 98% of the phase. This
-catches a server that stops returning responses while allowing a healthy long response to keep
-proving global server activity even when no new request starts near the boundary. A stalled run
+requires TTFT or inter-token-latency observations to extend through at least 95% of the phase. This
+catches a server that stops returning responses while allowing a sparse low-concurrency run to end
+with a long request in flight. A stalled run
 exits non-zero, the JSON artifact is retained with `submission_valid: false` and reason
 `insufficient_profile_metric_coverage`, and the error directs the operator to the server logs.
 Warmup observations and intentionally short `--unsafe-override` smoke runs do not count.

src/aiperf/common/scenario/inferencex_agentx_mvp.py

@@ -36,5 +36,5 @@
     system_idle_gap_cap_seconds=10.0,
     forbid_inter_turn_delay_cap=True,
     require_cache_bust=CacheBustTarget.FIRST_TURN_PREFIX,
-    minimum_profile_metric_coverage_ratio=0.98,
+    minimum_profile_metric_coverage_ratio=0.95,
 )

tests/unit/common/scenario/test_scenario_registry.py

@@ -36,7 +36,7 @@ def test_inferencex_agentx_mvp_registered():
     assert spec.inter_turn_delay_cap_seconds is None
     assert spec.trace_idle_gap_cap_seconds is None
     assert spec.system_idle_gap_cap_seconds == 10.0
-    assert spec.minimum_profile_metric_coverage_ratio == 0.98
+    assert spec.minimum_profile_metric_coverage_ratio == 0.95
     assert spec.forbid_trace_idle_gap_cap is False
     assert spec.forbid_inter_turn_delay_cap is True
 

tests/unit/records/test_records_manager_process_results.py

@@ -282,7 +282,7 @@ async def test_accumulator_summarize_failure_does_not_abort(self) -> None:
 
     @pytest.mark.asyncio
     async def test_agentx_metric_coverage_failure_is_fatal(self) -> None:
-        """A duration-based AgentX phase below 98% remains exportable but fatal."""
+        """A duration-based AgentX phase below 95% remains exportable but fatal."""
         acc = _make_summary_accumulator([_STUB_METRIC_RESULT])
         acc.profile_metric_duration_coverage.return_value = (
             ProfileMetricDurationCoverage(
@@ -306,7 +306,7 @@ async def test_agentx_metric_coverage_failure_is_fatal(self) -> None:
 
         assert len(result.fatal_errors) == 1
         assert result.fatal_errors[0].type == "ProfileMetricCoverageError"
-        assert "required 98.0%" in result.fatal_errors[0].message
+        assert "required 95.0%" in result.fatal_errors[0].message
         assert "check inference server logs" in result.fatal_errors[0].message
         assert result.results.runtime_submission_invalid_reasons == [
             "insufficient_profile_metric_coverage"