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src/Policy/StellaOps.Policy.Engine/Telemetry/PolicyEngineTelemetry.cs

@@ -476,6 +476,56 @@ public static class PolicyEngineTelemetry
 
     #endregion
 
+    #region VEX Decision Metrics
+
+    // Counter: policy_vex_decisions_total{status,lattice_state}
+    private static readonly Counter<long> VexDecisionsCounter =
+        Meter.CreateCounter<long>(
+            "policy_vex_decisions_total",
+            unit: "decisions",
+            description: "Total VEX decisions emitted by status and lattice state.");
+
+    // Counter: policy_vex_signing_total{success,rekor_submitted}
+    private static readonly Counter<long> VexSigningCounter =
+        Meter.CreateCounter<long>(
+            "policy_vex_signing_total",
+            unit: "signings",
+            description: "Total VEX decision signing operations.");
+
+    /// <summary>
+    /// Records a VEX decision emission.
+    /// </summary>
+    /// <param name="status">VEX status (not_affected, affected, under_investigation, fixed).</param>
+    /// <param name="latticeState">Lattice state code (U, SR, SU, RO, RU, CR, CU, X).</param>
+    public static void RecordVexDecision(string status, string latticeState)
+    {
+        var tags = new TagList
+        {
+            { "status", NormalizeTag(status) },
+            { "lattice_state", NormalizeTag(latticeState) },
+        };
+
+        VexDecisionsCounter.Add(1, tags);
+    }
+
+    /// <summary>
+    /// Records a VEX signing operation.
+    /// </summary>
+    /// <param name="success">Whether the signing operation succeeded.</param>
+    /// <param name="rekorSubmitted">Whether the envelope was submitted to Rekor.</param>
+    public static void RecordVexSigning(bool success, bool rekorSubmitted)
+    {
+        var tags = new TagList
+        {
+            { "success", success ? "true" : "false" },
+            { "rekor_submitted", rekorSubmitted ? "true" : "false" },
+        };
+
+        VexSigningCounter.Add(1, tags);
+    }
+
+    #endregion
+
     #region Reachability Metrics
 
     // Counter: policy_reachability_applied_total{state}