Rename Feedser to Concelier

src/StellaOps.Concelier.Models/OsvGhsaParityDiagnostics.cs

@@ -0,0 +1,72 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics.Metrics;
+
+namespace StellaOps.Concelier.Models;
+
+/// <summary>
+/// Emits telemetry for OSV vs GHSA parity reports so QA dashboards can track regression trends.
+/// </summary>
+public static class OsvGhsaParityDiagnostics
+{
+    private static readonly Meter Meter = new("StellaOps.Concelier.Models.OsvGhsaParity");
+    private static readonly Counter<long> TotalCounter = Meter.CreateCounter<long>(
+        "concelier.osv_ghsa.total",
+        unit: "count",
+        description: "Total GHSA identifiers evaluated for OSV parity.");
+    private static readonly Counter<long> IssueCounter = Meter.CreateCounter<long>(
+        "concelier.osv_ghsa.issues",
+        unit: "count",
+        description: "Parity issues grouped by dataset, issue kind, and field mask.");
+
+    public static void RecordReport(OsvGhsaParityReport report, string dataset)
+    {
+        ArgumentNullException.ThrowIfNull(report);
+        dataset = NormalizeDataset(dataset);
+
+        if (report.TotalGhsaIds > 0)
+        {
+            TotalCounter.Add(report.TotalGhsaIds, CreateTotalTags(dataset));
+        }
+
+        if (!report.HasIssues)
+        {
+            return;
+        }
+
+        foreach (var issue in report.Issues)
+        {
+            IssueCounter.Add(1, CreateIssueTags(dataset, issue));
+        }
+    }
+
+    private static KeyValuePair<string, object?>[] CreateTotalTags(string dataset)
+        => new[]
+        {
+            new KeyValuePair<string, object?>("dataset", dataset),
+        };
+
+    private static KeyValuePair<string, object?>[] CreateIssueTags(string dataset, OsvGhsaParityIssue issue)
+    {
+        var mask = issue.FieldMask.IsDefaultOrEmpty
+            ? "none"
+            : string.Join('|', issue.FieldMask);
+
+        return new[]
+        {
+            new KeyValuePair<string, object?>("dataset", dataset),
+            new KeyValuePair<string, object?>("issueKind", issue.IssueKind),
+            new KeyValuePair<string, object?>("fieldMask", mask),
+        };
+    }
+
+    private static string NormalizeDataset(string dataset)
+    {
+        if (string.IsNullOrWhiteSpace(dataset))
+        {
+            return "default";
+        }
+
+        return dataset.Trim().ToLowerInvariant();
+    }
+}