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src/Graph/StellaOps.Graph.Api/Services/GraphMetrics.cs

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+using System.Diagnostics.Metrics;
+
+namespace StellaOps.Graph.Api.Services;
+
+public interface IGraphMetrics : IDisposable
+{
+    Counter<long> BudgetDenied { get; }
+    Histogram<double> QueryLatencySeconds { get; }
+    Counter<long> OverlayCacheHit { get; }
+    Counter<long> OverlayCacheMiss { get; }
+    Histogram<double> ExportLatencySeconds { get; }
+    Meter Meter { get; }
+}
+
+public sealed class GraphMetrics : IGraphMetrics
+{
+    private readonly Meter _meter;
+
+    public GraphMetrics()
+    {
+        _meter = new Meter("StellaOps.Graph.Api", "1.0.0");
+        BudgetDenied = _meter.CreateCounter<long>("graph_query_budget_denied_total");
+        QueryLatencySeconds = _meter.CreateHistogram<double>("graph_tile_latency_seconds", unit: "s");
+        OverlayCacheHit = _meter.CreateCounter<long>("graph_overlay_cache_hits_total");
+        OverlayCacheMiss = _meter.CreateCounter<long>("graph_overlay_cache_misses_total");
+        ExportLatencySeconds = _meter.CreateHistogram<double>("graph_export_latency_seconds", unit: "s");
+    }
+
+    public Counter<long> BudgetDenied { get; }
+    public Histogram<double> QueryLatencySeconds { get; }
+    public Counter<long> OverlayCacheHit { get; }
+    public Counter<long> OverlayCacheMiss { get; }
+    public Histogram<double> ExportLatencySeconds { get; }
+    public Meter Meter => _meter;
+
+    public void Dispose()
+    {
+        _meter.Dispose();
+    }
+}