stabilizaiton work - projects rework for maintenanceability and ui livening

src/__Libraries/StellaOps.Provcache.Api/ProvcacheEndpointExtensions.GetMetrics.cs

@@ -0,0 +1,47 @@
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.Logging;
+
+namespace StellaOps.Provcache.Api;
+
+public static partial class ProvcacheEndpointExtensions
+{
+    /// <summary>
+    /// GET /v1/provcache/metrics
+    /// </summary>
+    private static async Task<IResult> GetMetricsAsync(
+        IProvcacheService provcacheService,
+        ILogger<ProvcacheApiEndpoints> logger,
+        CancellationToken cancellationToken)
+    {
+        logger.LogDebug("GET /v1/provcache/metrics");
+
+        try
+        {
+            var metrics = await provcacheService.GetMetricsAsync(cancellationToken);
+
+            var hitRate = metrics.TotalRequests > 0
+                ? (double)metrics.TotalHits / metrics.TotalRequests
+                : 0;
+
+            return Results.Ok(new ProvcacheMetricsResponse
+            {
+                TotalRequests = metrics.TotalRequests,
+                TotalHits = metrics.TotalHits,
+                TotalMisses = metrics.TotalMisses,
+                TotalInvalidations = metrics.TotalInvalidations,
+                HitRate = hitRate,
+                CurrentEntryCount = metrics.CurrentEntryCount,
+                AvgLatencyMs = metrics.AvgLatencyMs,
+                P99LatencyMs = metrics.P99LatencyMs,
+                ValkeyCacheHealthy = metrics.ValkeyCacheHealthy,
+                PostgresRepositoryHealthy = metrics.PostgresRepositoryHealthy,
+                CollectedAt = metrics.CollectedAt
+            });
+        }
+        catch (Exception ex)
+        {
+            logger.LogError(ex, "Error getting cache metrics");
+            return InternalError("Metrics retrieval failed");
+        }
+    }
+}