stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Provcache/ProvcacheService.Metrics.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace StellaOps.Provcache;
+
+public sealed partial class ProvcacheService
+{
+    /// <inheritdoc />
+    public async Task<ProvcacheMetrics> GetMetricsAsync(CancellationToken cancellationToken = default)
+    {
+        var stats = await _repository.GetStatisticsAsync(cancellationToken).ConfigureAwait(false);
+
+        ProvcacheTelemetry.SetItemsCount(stats.TotalEntries);
+
+        double avgLatency, p99Latency;
+        lock (_metricsLock)
+        {
+            avgLatency = _latencies.Count > 0 ? _latencies.Average() : 0;
+            p99Latency = _latencies.Count > 0
+                ? _latencies.OrderBy(x => x).ElementAt((int)(_latencies.Count * 0.99))
+                : 0;
+        }
+
+        return new ProvcacheMetrics
+        {
+            TotalRequests = Interlocked.Read(ref _totalRequests),
+            TotalHits = Interlocked.Read(ref _totalHits),
+            TotalMisses = Interlocked.Read(ref _totalMisses),
+            TotalInvalidations = Interlocked.Read(ref _totalInvalidations),
+            CurrentEntryCount = stats.TotalEntries,
+            AvgLatencyMs = avgLatency,
+            P99LatencyMs = p99Latency,
+            ValkeyCacheHealthy = true, // TODO: Add health check
+            PostgresRepositoryHealthy = true, // TODO: Add health check
+            CollectedAt = _timeProvider.GetUtcNow()
+        };
+    }
+}