feat(assisted-query): Add metrics search feature flag and forward options (#112240)

## Summary
- Register `gen-ai-explore-metrics-search` feature flag to gate the
metrics AI search bar independently
- Update `SearchAgentStartEndpoint` to accept the new flag when strategy
is "Metrics"
- Forward the full `options` dict to Seer instead of extracting only
`model_name`, so strategy-specific context (like `metric_context`)
passes through

## Test plan
- [ ] Verify the `gen-ai-explore-metrics-search` flag is registered and
exposed to the frontend
- [ ] Verify the endpoint accepts requests with `strategy: "Metrics"`
when the new flag is enabled
- [ ] Verify the full `options` dict is forwarded to Seer

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
Co-authored-by: Cursor Agent <cursoragent@cursor.com>

Author: 3 people

src/sentry/features/temporary.py

@@ -126,6 +126,8 @@ def register_temporary_features(manager: FeatureManager) -> None:
     manager.add("organizations:gen-ai-features", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable the 'translate' functionality for GenAI on the explore > traces page
     manager.add("organizations:gen-ai-search-agent-translate", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
+    # Enable AI search bar on the explore > metrics tab
+    manager.add("organizations:gen-ai-explore-metrics-search", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable GenAI consent
     manager.add("organizations:gen-ai-consent", OrganizationFeature, FeatureHandlerStrategy.FLAGPOLE, api_expose=True)
     # Enable increased issue_owners rate limit for auto-assignment

src/sentry/seer/endpoints/search_agent_start.py

@@ -67,6 +67,7 @@ def send_search_agent_start_request(
     user_email: str | None = None,
     timezone: str | None = None,
     model_name: str | None = None,
+    metric_context: dict[str, Any] | None = None,
     viewer_context: SeerViewerContext | None = None,
 ) -> dict[str, Any]:
     """
@@ -87,6 +88,8 @@ def send_search_agent_start_request(
     options: dict[str, Any] = {}
     if model_name is not None:
         options["model_name"] = model_name
+    if metric_context is not None:
+        options["metric_context"] = metric_context
     if options:
         body["options"] = options
 
@@ -129,15 +132,23 @@ def post(self, request: Request, organization: Organization) -> Response:
         strategy = validated_data.get("strategy", "Traces")
         options = validated_data.get("options") or {}
         model_name = options.get("model_name")
+        metric_context = options.get("metric_context")
 
         projects = self.get_projects(
             request, organization, project_ids=set(validated_data["project_ids"])
         )
         project_ids = [project.id for project in projects]
 
-        if not features.has(
+        has_feature = features.has(
             "organizations:gen-ai-search-agent-translate", organization, actor=request.user
-        ):
+        )
+        if strategy == "Metrics":
+            has_feature = has_feature and features.has(
+                "organizations:gen-ai-explore-metrics-search",
+                organization,
+                actor=request.user,
+            )
+        if not has_feature:
             return Response(
                 {"detail": "Feature flag not enabled"},
                 status=status.HTTP_403_FORBIDDEN,
@@ -174,6 +185,7 @@ def post(self, request: Request, organization: Organization) -> Response:
                 user_email=user_email,
                 timezone=timezone,
                 model_name=model_name,
+                metric_context=metric_context,
                 viewer_context=viewer_context,
             )
 

src/sentry/seer/endpoints/search_agent_state.py

@@ -81,9 +81,12 @@ def get(self, request: Request, organization: Organization, run_id: str) -> Resp
                 }
             }
         """
-        if not features.has(
+        has_feature = features.has(
             "organizations:gen-ai-search-agent-translate", organization, actor=request.user
-        ):
+        ) or features.has(
+            "organizations:gen-ai-explore-metrics-search", organization, actor=request.user
+        )
+        if not has_feature:
             return Response(
                 {"detail": "Feature flag not enabled"},
                 status=status.HTTP_403_FORBIDDEN,