dashboard improvements (#896)

- Feature: Added Workspaces dashboard page with HTTP request stats and per-workspace metrics
- Feature: Added Build Storage dashboard page with service-specific HTTP request stats
- Improvement: Front page now shows Hub and Object Store activity tiles; HTTP panel is fixed above the tiles grid
- Improvement: HTTP stats tiles now include 5m/15m rates and p999/max latency across all service pages

2 files changed, 12 insertions, 1 deletions

diff --git a/src/zenserver/hub/httphubservice.cpp b/src/zenserver/hub/httphubservice.cpp
index dcab50f2d..ebefcf2e3 100644
--- a/src/zenserver/hub/httphubservice.cpp
+++ b/src/zenserver/hub/httphubservice.cpp
@@ -286,11 +286,21 @@ HttpHubService::HandleStatusRequest(HttpServerRequest& Request)
 void
 HttpHubService::HandleStatsRequest(HttpServerRequest& Request)
 {
+	Request.WriteResponse(HttpResponseCode::OK, CollectStats());
+}
+
+CbObject
+HttpHubService::CollectStats()
+{
 	CbObjectWriter Cbo;
 
 	EmitSnapshot("requests", m_HttpRequests, Cbo);
 
-	Request.WriteResponse(HttpResponseCode::OK, Cbo.Save());
+	Cbo << "currentInstanceCount" << m_Hub.GetInstanceCount();
+	Cbo << "maxInstanceCount" << m_Hub.GetMaxInstanceCount();
+	Cbo << "instanceLimit" << m_Hub.GetConfig().InstanceLimit;
+
+	return Cbo.Save();
 }
 
 uint64_t
diff --git a/src/zenserver/hub/httphubservice.h b/src/zenserver/hub/httphubservice.h
index 5f940017e..1bb1c303e 100644
--- a/src/zenserver/hub/httphubservice.h
+++ b/src/zenserver/hub/httphubservice.h
@@ -29,6 +29,7 @@ public:
 	virtual void		HandleRequest(HttpServerRequest& Request) override;
 	virtual void		HandleStatusRequest(HttpServerRequest& Request) override;
 	virtual void		HandleStatsRequest(HttpServerRequest& Request) override;
+	virtual CbObject	CollectStats() override;
 	virtual uint64_t	GetActivityCounter() override;
 
 	void SetNotificationEndpoint(std::string_view UpstreamNotificationEndpoint, std::string_view InstanceId);