SignalR Logging: Add ActivitySource for server and client (#34201)

* SignalR Logging: Add ActivitySource

* Moved new tracing section, made corrections

* Minor change intro ActivitySource

* Edit sweep of the rest of doc, minor changes

* More minor editing on rest of doc

Author: wadepickett

aspnetcore/signalr/diagnostics.md

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+using Microsoft.AspNetCore.SignalR;
+
+namespace SignalRChat.Hubs
+{
+    public class ChatHub : Hub
+    {
+        public async Task SendMessage(string user, string message)
+        {
+            await Clients.All.SendAsync("ReceiveMessage", user, message);
+        }
+    }
+}

aspnetcore/signalr/diagnostics/_static/9.x/signalr-activities-events.png

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+@page
+@model ErrorModel
+@{
+    ViewData["Title"] = "Error";
+}
+
+<h1 class="text-danger">Error.</h1>
+<h2 class="text-danger">An error occurred while processing your request.</h2>
+
+@if (Model.ShowRequestId)
+{
+    <p>
+        <strong>Request ID:</strong> <code>@Model.RequestId</code>
+    </p>
+}
+
+<h3>Development Mode</h3>
+<p>
+    Swapping to the <strong>Development</strong> environment displays detailed information about the error that occurred.
+</p>
+<p>
+    <strong>The Development environment shouldn't be enabled for deployed applications.</strong>
+    It can result in displaying sensitive information from exceptions to end users.
+    For local debugging, enable the <strong>Development</strong> environment by setting the <strong>ASPNETCORE_ENVIRONMENT</strong> environment variable to <strong>Development</strong>
+    and restarting the app.
+</p>

aspnetcore/signalr/diagnostics/_static/9.x/signalr-distributed-tracing-aspire-dashboard.png

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+using System.Diagnostics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace SignalRChat.Pages
+{
+    [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
+    [IgnoreAntiforgeryToken]
+    public class ErrorModel : PageModel
+    {
+        public string? RequestId { get; set; }
+
+        public bool ShowRequestId => !string.IsNullOrEmpty(RequestId);
+
+        private readonly ILogger<ErrorModel> _logger;
+
+        public ErrorModel(ILogger<ErrorModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+            RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier;
+        }
+    }
+
+}

aspnetcore/signalr/diagnostics/samples/9.x/SignalRChatTraceExample/ChatHub/ChatHub.cs

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+@page
+<div class="container">
+    <div class="row p-1">
+        <div class="col-1">User</div>
+        <div class="col-5"><input type="text" id="userInput" /></div>
+    </div>
+    <div class="row p-1">
+        <div class="col-1">Message</div>
+        <div class="col-5"><input type="text" class="w-100" id="messageInput" /></div>
+    </div>
+    <div class="row p-1">
+        <div class="col-6 text-end">
+            <input type="button" id="sendButton" value="Send Message" />
+        </div>
+    </div>
+    <div class="row p-1">
+        <div class="col-6">
+            <hr />
+        </div>
+    </div>
+    <div class="row p-1">
+        <div class="col-6">
+            <ul id="messagesList"></ul>
+        </div>
+    </div>
+</div>
+<script src="~/js/signalr/dist/browser/signalr.js"></script>
+<script src="~/js/chat.js"></script>

aspnetcore/signalr/diagnostics/samples/9.x/SignalRChatTraceExample/Pages/Error.cshtml

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+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace SignalRChat.Pages
+{
+    public class IndexModel : PageModel
+    {
+        private readonly ILogger<IndexModel> _logger;
+
+        public IndexModel(ILogger<IndexModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+
+        }
+    }
+}

aspnetcore/signalr/diagnostics/samples/9.x/SignalRChatTraceExample/Pages/Error.cshtml.cs

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+@page
+@model PrivacyModel
+@{
+    ViewData["Title"] = "Privacy Policy";
+}
+<h1>@ViewData["Title"]</h1>
+
+<p>Use this page to detail your site's privacy policy.</p>

aspnetcore/signalr/diagnostics/samples/9.x/SignalRChatTraceExample/Pages/Index.cshtml

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+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+
+namespace SignalRChat.Pages
+{
+    public class PrivacyModel : PageModel
+    {
+        private readonly ILogger<PrivacyModel> _logger;
+
+        public PrivacyModel(ILogger<PrivacyModel> logger)
+        {
+            _logger = logger;
+        }
+
+        public void OnGet()
+        {
+        }
+    }
+
+}