Dashboard overhaul, compute integration (#814)

- **Frontend dashboard overhaul**: Unified compute/main dashboards into a single shared UI. Added new pages for cache, projects, metrics, sessions, info (build/runtime config, system stats). Added live-update via WebSockets with pause control, sortable detail tables, themed styling. Refactored compute/hub/orchestrator pages into modular JS.
- **HTTP server fixes and stats**: Fixed http.sys local-only fallback when default port is in use, implemented root endpoint redirect for http.sys, fixed Linux/Mac port reuse. Added /stats endpoint exposing HTTP server metrics (bytes transferred, request rates). Added WebSocket stats tracking.
- **OTEL/diagnostics hardening**: Improved OTLP HTTP exporter with better error handling and resilience. Extended diagnostics services configuration.
- **Session management**: Added new sessions service with HTTP endpoints for registering, updating, querying, and removing sessions. Includes session log file support. This is still WIP.
- **CLI subcommand support**: Added support for commands with subcommands in the zen CLI tool, with improved command dispatch.
- **Misc**: Exposed CPU usage/hostname to frontend, fixed JS compact binary float32/float64 decoding, limited projects displayed on front page to 25 sorted by last access, added vscode:// link support.

Also contains some fixes from TSAN analysis.

1 files changed, 128 insertions, 9 deletions

diff --git a/src/zenserver/storage/cache/httpstructuredcache.cpp b/src/zenserver/storage/cache/httpstructuredcache.cpp
index 00151f79e..06b8f6c27 100644
--- a/src/zenserver/storage/cache/httpstructuredcache.cpp
+++ b/src/zenserver/storage/cache/httpstructuredcache.cpp
@@ -1827,8 +1827,8 @@ HttpStructuredCacheService::HandleRpcRequest(HttpServerRequest& Request, std::st
 	}
 }
 
-void
-HttpStructuredCacheService::HandleStatsRequest(HttpServerRequest& Request)
+CbObject
+HttpStructuredCacheService::CollectStats()
 {
 	ZEN_MEMSCOPE(GetCacheHttpTag());
 
@@ -1858,13 +1858,132 @@ HttpStructuredCacheService::HandleStatsRequest(HttpServerRequest& Request)
 	const CidStoreSize	 CidSize   = m_CidStore.TotalSize();
 	const CacheStoreSize CacheSize = m_CacheStore.TotalSize();
 
+	Cbo.BeginObject("cache");
+	{
+		Cbo << "badrequestcount" << BadRequestCount;
+		Cbo.BeginObject("rpc");
+		Cbo << "count" << RpcRequests;
+		Cbo << "ops" << RpcRecordBatchRequests + RpcValueBatchRequests + RpcChunkBatchRequests;
+		Cbo.BeginObject("records");
+		Cbo << "count" << RpcRecordRequests;
+		Cbo << "ops" << RpcRecordBatchRequests;
+		Cbo.EndObject();
+		Cbo.BeginObject("values");
+		Cbo << "count" << RpcValueRequests;
+		Cbo << "ops" << RpcValueBatchRequests;
+		Cbo.EndObject();
+		Cbo.BeginObject("chunks");
+		Cbo << "count" << RpcChunkRequests;
+		Cbo << "ops" << RpcChunkBatchRequests;
+		Cbo.EndObject();
+		Cbo.EndObject();
+
+		Cbo.BeginObject("size");
+		{
+			Cbo << "disk" << CacheSize.DiskSize;
+			Cbo << "memory" << CacheSize.MemorySize;
+		}
+		Cbo.EndObject();
+
+		Cbo << "hits" << HitCount << "misses" << MissCount << "writes" << WriteCount;
+		Cbo << "hit_ratio" << (TotalCount > 0 ? (double(HitCount) / double(TotalCount)) : 0.0);
+
+		if (m_UpstreamCache.IsActive())
+		{
+			Cbo << "upstream_ratio" << (HitCount > 0 ? (double(UpstreamHitCount) / double(HitCount)) : 0.0);
+			Cbo << "upstream_hits" << m_CacheStats.UpstreamHitCount;
+			Cbo << "upstream_ratio" << (HitCount > 0 ? (double(UpstreamHitCount) / double(HitCount)) : 0.0);
+			Cbo << "upstream_ratio" << (HitCount > 0 ? (double(UpstreamHitCount) / double(HitCount)) : 0.0);
+		}
+
+		Cbo << "cidhits" << ChunkHitCount << "cidmisses" << ChunkMissCount << "cidwrites" << ChunkWriteCount;
+
+		{
+			ZenCacheStore::CacheStoreStats StoreStatsData = m_CacheStore.Stats();
+			Cbo.BeginObject("store");
+			Cbo << "hits" << StoreStatsData.HitCount << "misses" << StoreStatsData.MissCount << "writes" << StoreStatsData.WriteCount
+				<< "rejected_writes" << StoreStatsData.RejectedWriteCount << "rejected_reads" << StoreStatsData.RejectedReadCount;
+			const uint64_t StoreTotal = StoreStatsData.HitCount + StoreStatsData.MissCount;
+			Cbo << "hit_ratio" << (StoreTotal > 0 ? (double(StoreStatsData.HitCount) / double(StoreTotal)) : 0.0);
+			EmitSnapshot("read", StoreStatsData.GetOps, Cbo);
+			EmitSnapshot("write", StoreStatsData.PutOps, Cbo);
+			Cbo.EndObject();
+		}
+	}
+	Cbo.EndObject();
+
+	if (m_UpstreamCache.IsActive())
+	{
+		EmitSnapshot("upstream_gets", m_UpstreamGetRequestTiming, Cbo);
+		Cbo.BeginObject("upstream");
+		{
+			m_UpstreamCache.GetStatus(Cbo);
+		}
+		Cbo.EndObject();
+	}
+
+	Cbo.BeginObject("cid");
+	{
+		Cbo.BeginObject("size");
+		{
+			Cbo << "tiny" << CidSize.TinySize;
+			Cbo << "small" << CidSize.SmallSize;
+			Cbo << "large" << CidSize.LargeSize;
+			Cbo << "total" << CidSize.TotalSize;
+		}
+		Cbo.EndObject();
+	}
+	Cbo.EndObject();
+
+	return Cbo.Save();
+}
+
+void
+HttpStructuredCacheService::HandleStatsRequest(HttpServerRequest& Request)
+{
+	ZEN_MEMSCOPE(GetCacheHttpTag());
+
 	bool ShowCidStoreStats	 = Request.GetQueryParams().GetValue("cidstorestats") == "true";
 	bool ShowCacheStoreStats = Request.GetQueryParams().GetValue("cachestorestats") == "true";
 
-	CidStoreStats CidStoreStats = {};
+	if (!ShowCidStoreStats && !ShowCacheStoreStats)
+	{
+		Request.WriteResponse(HttpResponseCode::OK, CollectStats());
+		return;
+	}
+
+	// Full stats with optional detailed store/cid breakdowns
+
+	CbObjectWriter Cbo;
+
+	EmitSnapshot("requests", m_HttpRequests, Cbo);
+
+	const uint64_t		 HitCount		  = m_CacheStats.HitCount;
+	const uint64_t		 UpstreamHitCount = m_CacheStats.UpstreamHitCount;
+	const uint64_t		 MissCount		  = m_CacheStats.MissCount;
+	const uint64_t		 WriteCount		  = m_CacheStats.WriteCount;
+	const uint64_t		 BadRequestCount  = m_CacheStats.BadRequestCount;
+	struct CidStoreStats StoreStats		  = m_CidStore.Stats();
+	const uint64_t		 ChunkHitCount	  = StoreStats.HitCount;
+	const uint64_t		 ChunkMissCount	  = StoreStats.MissCount;
+	const uint64_t		 ChunkWriteCount  = StoreStats.WriteCount;
+	const uint64_t		 TotalCount		  = HitCount + MissCount;
+
+	const uint64_t RpcRequests			  = m_CacheStats.RpcRequests;
+	const uint64_t RpcRecordRequests	  = m_CacheStats.RpcRecordRequests;
+	const uint64_t RpcRecordBatchRequests = m_CacheStats.RpcRecordBatchRequests;
+	const uint64_t RpcValueRequests		  = m_CacheStats.RpcValueRequests;
+	const uint64_t RpcValueBatchRequests  = m_CacheStats.RpcValueBatchRequests;
+	const uint64_t RpcChunkRequests		  = m_CacheStats.RpcChunkRequests;
+	const uint64_t RpcChunkBatchRequests  = m_CacheStats.RpcChunkBatchRequests;
+
+	const CidStoreSize	 CidSize   = m_CidStore.TotalSize();
+	const CacheStoreSize CacheSize = m_CacheStore.TotalSize();
+
+	CidStoreStats DetailedCidStoreStats = {};
 	if (ShowCidStoreStats)
 	{
-		CidStoreStats = m_CidStore.Stats();
+		DetailedCidStoreStats = m_CidStore.Stats();
 	}
 	ZenCacheStore::CacheStoreStats CacheStoreStats = {};
 	if (ShowCacheStoreStats)
@@ -2002,8 +2121,8 @@ HttpStructuredCacheService::HandleStatsRequest(HttpServerRequest& Request)
 			}
 			Cbo.EndObject();
 		}
-		Cbo.EndObject();
 	}
+	Cbo.EndObject();
 
 	if (m_UpstreamCache.IsActive())
 	{
@@ -2029,10 +2148,10 @@ HttpStructuredCacheService::HandleStatsRequest(HttpServerRequest& Request)
 		if (ShowCidStoreStats)
 		{
 			Cbo.BeginObject("store");
-			Cbo << "hits" << CidStoreStats.HitCount << "misses" << CidStoreStats.MissCount << "writes" << CidStoreStats.WriteCount;
-			EmitSnapshot("read", CidStoreStats.FindChunkOps, Cbo);
-			EmitSnapshot("write", CidStoreStats.AddChunkOps, Cbo);
-			//		EmitSnapshot("exists", CidStoreStats.ContainChunkOps, Cbo);
+			Cbo << "hits" << DetailedCidStoreStats.HitCount << "misses" << DetailedCidStoreStats.MissCount << "writes"
+				<< DetailedCidStoreStats.WriteCount;
+			EmitSnapshot("read", DetailedCidStoreStats.FindChunkOps, Cbo);
+			EmitSnapshot("write", DetailedCidStoreStats.AddChunkOps, Cbo);
 			Cbo.EndObject();
 		}
 	}