fix(otlp): span exporter now inherits configured resource_attributes

_resource_attributes() in otlp_exporter.py built its own hardcoded
resource dict (service.name/instance.id/telemetry.scope only) instead
of reusing gateway_health_export.py's _runtime_resource_attributes(),
which already applies the resource_attributes allowlist from config.
Result: operator-configured attributes like deployment.environment.name
reached metrics and diagnostic logs but never spans.

Span resource building now delegates to the same
_runtime_resource_attributes() helper metrics/logs already use,
removing the duplicate implementation instead of patching it in place.

agent/monitoring/otlp_exporter.py

@@ -116,14 +116,12 @@ def build_exporter(config: Dict[str, Any]):
 
 
 def _resource_attributes(config: Dict[str, Any]) -> Dict[str, str]:
-    from agent.monitoring.gateway_health import _safe_instance_id
-    from agent.monitoring.policy import ensure_install_id
+    # Lazy import: gateway_health_export imports this module back (for
+    # start_streaming), so the dependency must resolve at call time, not
+    # at module load, to avoid a circular import.
+    from agent.monitoring.gateway_health_export import _runtime_resource_attributes
 
-    return {
-        "service.name": "hermes-gateway",
-        "service.instance.id": _safe_instance_id(ensure_install_id(config)),
-        "telemetry.scope": "gateway_monitoring",
-    }
+    return _runtime_resource_attributes(config, telemetry_scope="gateway_monitoring")
 
 
 def _make_provider(config: Dict[str, Any]):

tests/monitoring/test_otlp_exporter.py

@@ -66,6 +66,20 @@ def test_trace_resource_includes_stable_hashed_instance():
     assert attrs["telemetry.scope"] == "gateway_monitoring"
 
 
+def test_trace_resource_includes_configured_deployment_environment():
+    attrs = OE._resource_attributes({
+        "monitoring": {
+            "install_id": "private-install-id",
+            "gateway_health_export": {
+                "resource_attributes": {"deployment.environment.name": "production"},
+            },
+        },
+    })
+
+    assert attrs["deployment.environment.name"] == "production"
+    assert attrs["service.name"] == "hermes-gateway"
+
+
 
 
 def test_streamer_receives_events_and_respects_filter(monkeypatch):