[CI] [SKIP TESTS] Add detailed Probe-Agent connection diagnostics

backend/fleet/tests/Fleet.Tests/LinkTests.cs

@@ -364,13 +364,18 @@ public sealed class LinkTests
         agent.KnockPeers.Add(probe.PublicKeySpki);
         await agent.Listener.Started.Task;
 
-        (PeerSessionInfo client, TlsFrameTransport transport) = await PeerConnector.ConnectAsync("127.0.0.1", agent.Listener.Port, agent.PublicKey, probe, "prb_1", null, 1 << 20, TimeProvider.System, default);
+        var logs = new Fleet.Hosting.BufferedNodeLog(NullNodeLog.Instance, TimeProvider.System);
+        var scoped = new ContextNodeLog(logs, ("attempt_id", "test-attempt"));
+        (PeerSessionInfo client, TlsFrameTransport transport) = await PeerConnector.ConnectAsync("127.0.0.1", agent.Listener.Port, agent.PublicKey, probe, "prb_1", null, 1 << 20, TimeProvider.System, scoped, default);
         await using (transport)
         {
             PeerSessionInfo server = await seen.Task.WaitAsync(TimeSpan.FromSeconds(5));
             Assert.Equal("prb_1", server.PeerId);
             Assert.Equal(client.Credentials.Key, server.Credentials.Key);
             Assert.Equal(client.Credentials.SessionId, server.Credentials.SessionId);
+            NodeLogBatch batch = logs.TakeBatch(32);
+            Assert.Equal(new[] { "tcp_connect", "tls", "peer_auth" }, batch.Records.Select(x => x.Fields["phase"]));
+            Assert.All(batch.Records, entry => Assert.Equal("test-attempt", entry.Fields["attempt_id"]));
         }
     }
 
@@ -383,8 +388,12 @@ public sealed class LinkTests
         agent.KnockPeers.AddRange([probe.PublicKeySpki, impostor.PublicKeySpki]); // 敲门通过之后，名册外的 ID 和伪造的签名仍然被拒绝
         await agent.Listener.Started.Task;
 
+        var logs = new Fleet.Hosting.BufferedNodeLog(NullNodeLog.Instance, TimeProvider.System);
         InvalidOperationException unknown = await Assert.ThrowsAsync<InvalidOperationException>(async () =>
-            await PeerConnector.ConnectAsync("127.0.0.1", agent.Listener.Port, agent.PublicKey, probe, "prb_unknown", null, 1 << 20, TimeProvider.System, default));
+            await PeerConnector.ConnectAsync("127.0.0.1", agent.Listener.Port, agent.PublicKey, probe, "prb_unknown", null, 1 << 20, TimeProvider.System, logs, default));
+        NodeLogRecord failure = Assert.Single(logs.TakeBatch(32).Records, entry => entry.Message == "peer control handshake failed");
+        Assert.Equal("peer_auth", failure.Fields["phase"]);
+        Assert.Equal("InvalidOperationException", failure.Fields["exception"]);
         InvalidOperationException forged = await Assert.ThrowsAsync<InvalidOperationException>(async () =>
             await PeerConnector.ConnectAsync("127.0.0.1", agent.Listener.Port, agent.PublicKey, impostor, "prb_1", null, 1 << 20, TimeProvider.System, default));
         Assert.Equal(unknown.Message, forged.Message);