OpenTelemetry and Azure Monitor Exporter support

Microsoft.FeatureManagement.sln

@@ -15,6 +15,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Examples", "Examples", "{FB
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Tests.FeatureManagement.AspNetCore", "tests\Tests.FeatureManagement.AspNetCore\Tests.FeatureManagement.AspNetCore.csproj", "{FC0DC3E2-5646-4AEC-A7DB-2D6167BC3BB4}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Tests.FeatureManagement.Telemetry.AzureMonitor", "tests\Tests.FeatureManagement.Telemetry.AzureMonitor\Tests.FeatureManagement.Telemetry.AzureMonitor.csproj", "{B7D4E5F6-3A2B-4C8D-9E1F-7A8B9C0D1E2F}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "ConsoleApp", "examples\ConsoleApp\ConsoleApp.csproj", "{7B98D293-F270-423E-A9A6-0D388E903AE9}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "RazorPages", "examples\RazorPages\RazorPages.csproj", "{36DBB413-D9CA-4C56-AE5B-EAEA4C344DB3}"
@@ -25,6 +27,8 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "TargetingConsoleApp", "exam
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.FeatureManagement.Telemetry.ApplicationInsights", "src\Microsoft.FeatureManagement.Telemetry.ApplicationInsights\Microsoft.FeatureManagement.Telemetry.ApplicationInsights.csproj", "{7964DC66-B2D3-412D-B18A-86D1E07D149D}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.FeatureManagement.Telemetry.AzureMonitor", "src\Microsoft.FeatureManagement.Telemetry.AzureMonitor\Microsoft.FeatureManagement.Telemetry.AzureMonitor.csproj", "{A8F5C3D7-2E41-4B92-A3D1-6C7E8F9A1B2C}"
+EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "VariantAndTelemetryDemo", "examples\VariantAndTelemetryDemo\VariantAndTelemetryDemo.csproj", "{1502529E-47E9-4306-98C4-BF6CF7C7C275}"
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "BlazorServerApp", "examples\BlazorServerApp\BlazorServerApp.csproj", "{12BAB5A6-4EEB-4917-B5D9-4AFB6253008E}"
@@ -53,6 +57,10 @@ Global
 		{FC0DC3E2-5646-4AEC-A7DB-2D6167BC3BB4}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{FC0DC3E2-5646-4AEC-A7DB-2D6167BC3BB4}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{FC0DC3E2-5646-4AEC-A7DB-2D6167BC3BB4}.Release|Any CPU.Build.0 = Release|Any CPU
+		{B7D4E5F6-3A2B-4C8D-9E1F-7A8B9C0D1E2F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B7D4E5F6-3A2B-4C8D-9E1F-7A8B9C0D1E2F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B7D4E5F6-3A2B-4C8D-9E1F-7A8B9C0D1E2F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B7D4E5F6-3A2B-4C8D-9E1F-7A8B9C0D1E2F}.Release|Any CPU.Build.0 = Release|Any CPU
 		{7B98D293-F270-423E-A9A6-0D388E903AE9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{7B98D293-F270-423E-A9A6-0D388E903AE9}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7B98D293-F270-423E-A9A6-0D388E903AE9}.Release|Any CPU.ActiveCfg = Release|Any CPU
@@ -73,6 +81,10 @@ Global
 		{7964DC66-B2D3-412D-B18A-86D1E07D149D}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{7964DC66-B2D3-412D-B18A-86D1E07D149D}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{7964DC66-B2D3-412D-B18A-86D1E07D149D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A8F5C3D7-2E41-4B92-A3D1-6C7E8F9A1B2C}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A8F5C3D7-2E41-4B92-A3D1-6C7E8F9A1B2C}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A8F5C3D7-2E41-4B92-A3D1-6C7E8F9A1B2C}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A8F5C3D7-2E41-4B92-A3D1-6C7E8F9A1B2C}.Release|Any CPU.Build.0 = Release|Any CPU
 		{1502529E-47E9-4306-98C4-BF6CF7C7C275}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
 		{1502529E-47E9-4306-98C4-BF6CF7C7C275}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{1502529E-47E9-4306-98C4-BF6CF7C7C275}.Release|Any CPU.ActiveCfg = Release|Any CPU

examples/VariantAndAzureMonitorDemo/LoggerExtensions.cs

@@ -0,0 +1,25 @@
+namespace VariantAndAzureMonitorDemo
+{
+    public static class LoggerExtensions
+    {
+        private static readonly Action<ILogger, string, int, Exception?> _vote = LoggerMessage.Define<string, int>(
+            LogLevel.Information,
+            new EventId(1, "microsoft.custom_event.name"),
+            "{microsoft.custom_event.name} {ImageRating}");
+
+        private static readonly Action<ILogger, string, string, long, Exception?> _checkout = LoggerMessage.Define<string, string, long>(
+            LogLevel.Information,
+            new EventId(1, "microsoft.custom_event.name"),
+            "{microsoft.custom_event.name} {success} {amount}");
+
+        public static void LogVote(this ILogger logger, int rating)
+        {
+            _vote(logger, "Vote", rating, null);
+        }
+
+        public static void LogCheckout(this ILogger logger, long amount)
+        {
+            _checkout(logger, "checkout", "yes", amount, null);
+        }
+    }
+}

examples/VariantAndAzureMonitorDemo/Pages/Checkout.cshtml

@@ -0,0 +1,21 @@
+@page
+@model CheckoutModel
+@{
+    ViewData["Title"] = "Checkout";
+}
+<h1>@ViewData["Title"]</h1>
+
+<p>Click Below To Check Out!</p>
+
+<form method="post">
+    <button type="submit" id="checkout" name="checkout">
+        Check Out
+    </button>
+</form>
+
+@if (TempData["CheckedOut"] != null)
+{
+    <script>
+        alert('Checked Out!');
+    </script>
+}

examples/VariantAndAzureMonitorDemo/Pages/Checkout.cshtml.cs

@@ -0,0 +1,35 @@
+using System.Diagnostics.Metrics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Logging;
+
+namespace VariantAndAzureMonitorDemo.Pages
+{
+    public class CheckoutModel : PageModel
+    {
+        private readonly Meter _meter;
+        private readonly ILogger<CheckoutModel> _logger;
+
+        public CheckoutModel(IMeterFactory meterFactory, ILogger<CheckoutModel> logger)
+        {
+            _meter = meterFactory?.Create("VariantAndAzureMonitorDemo") ?? throw new ArgumentNullException(nameof(meterFactory));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public IActionResult OnPost()
+        {
+            long amount = Random.Shared.Next(1, 100);
+
+            // Track the checkout event using ILogger custom event
+            _logger.LogCheckout(amount);
+
+            // Track the checkout amount metric
+            var checkoutAmountHistogram = _meter.CreateHistogram<long>("checkoutAmount");
+            checkoutAmountHistogram.Record(amount);
+
+            TempData["CheckedOut"] = true;
+
+            return Page();
+        }
+    }
+}

examples/VariantAndAzureMonitorDemo/Pages/Error.cshtml

@@ -0,0 +1,26 @@
+@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>

examples/VariantAndAzureMonitorDemo/Pages/Error.cshtml.cs

@@ -0,0 +1,27 @@
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using System.Diagnostics;
+
+namespace VariantAndAzureMonitorDemo.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;
+        }
+    }
+}

examples/VariantAndAzureMonitorDemo/Pages/Index.cshtml

@@ -0,0 +1,72 @@
+@page
+@model IndexModel
+@{
+    ViewData["Title"] = "Home page";
+}
+
+<div class="text-center mb-40">
+    <h1 class="display-4">Welcome, @Model.Username !</h1>
+</div>
+
+<div class="text-center">
+    <div style="display:inline-block;width:500px;">
+        <img class="mb-40" src="@ViewData["ImageUri"]" />
+        <div class="panel panel-primary">
+            <div class="panel-heading">
+                <h3 class="panel-title">
+                    <span class="glyphicon glyphicon-arrow-right"></span>Rate the image on a scale of 1 - 5 !<span class="glyphicon glyphicon-new-window"></span>
+                </h3>
+            </div>
+            <form action="/" method="post">
+                <div class="panel-body mb-5">
+                    <ul class="list-group">
+                        <li class="list-group-item">
+                            <div class="radio">
+                                <label>
+                                    <input type="radio" name="imageScore" value="5">
+                                    5
+                                </label>
+                            </div>
+                        </li>
+                        <li class="list-group-item">
+                            <div class="radio">
+                                <label>
+                                    <input type="radio" name="imageScore" value="4">
+                                    4
+                                </label>
+                            </div>
+                        </li>
+                        <li class="list-group-item">
+                            <div class="radio">
+                                <label>
+                                    <input type="radio" name="imageScore" value="3">
+                                    3
+                                </label>
+                            </div>
+                        </li>
+                        <li class="list-group-item">
+                            <div class="radio">
+                                <label>
+                                    <input type="radio" name="imageScore" value="2">
+                                    2
+                                </label>
+                            </div>
+                        </li>
+                        <li class="list-group-item">
+                            <div class="radio">
+                                <label>
+                                    <input type="radio" name="imageScore" value="1">
+                                    1
+                                </label>
+                            </div>
+                        </li>
+                    </ul>
+                </div>
+                @Html.AntiForgeryToken()
+                <div class="panel-footer">
+                    <input type="submit" class="btn btn-primary btn-sm" value="Vote" />
+                </div>
+            </form>
+        </div>
+    </div>
+</div>

examples/VariantAndAzureMonitorDemo/Pages/Index.cshtml.cs

@@ -0,0 +1,66 @@
+using System.Diagnostics.Metrics;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Microsoft.Extensions.Logging;
+using Microsoft.FeatureManagement;
+
+namespace VariantAndAzureMonitorDemo.Pages
+{
+    public class IndexModel : PageModel
+    {
+        private readonly IVariantFeatureManager _featureManager;
+        private readonly Meter _meter;
+        private readonly ILogger<IndexModel> _logger;
+
+        public IndexModel(IVariantFeatureManager featureManager, IMeterFactory meterFactory, ILogger<IndexModel> logger)
+        {
+            _featureManager = featureManager ?? throw new ArgumentNullException(nameof(featureManager));
+            _meter = meterFactory?.Create("VariantAndAzureMonitorDemo") ?? throw new ArgumentNullException(nameof(meterFactory));
+            _logger = logger ?? throw new ArgumentNullException(nameof(logger));
+        }
+
+        public string Username { get; set; }
+
+        public async Task<IActionResult> OnGet()
+        {
+            Username = HttpContext.User.Identity.Name;
+
+            if (string.IsNullOrEmpty(Username))
+            {
+                return Redirect("/RandomizeUser");
+            }
+
+            //
+            // Use application's feature manager to get assigned variant for current user
+            Variant variant = await _featureManager
+                .GetVariantAsync("ImageRating", HttpContext.RequestAborted);
+
+            //
+            // Set the page's display image based on the assigned variant.
+            ViewData["ImageUri"] = variant.Configuration.Value;
+
+            return Page();
+        }
+
+        public IActionResult OnPost()
+        {
+            if (Request.Form != null)
+            {
+                string val = Request.Form["imageScore"];
+
+                if (val != null &&
+                    int.TryParse(val, out int rating))
+                {
+                    // Create a histogram to track the image rating
+                    var imageRatingHistogram = _meter.CreateHistogram<long>("ImageRating");
+                    imageRatingHistogram.Record(rating);
+
+                    // Track the vote event using ILogger custom event
+                    _logger.LogVote(rating);
+                }
+            }
+
+            return Redirect("/RandomizeUser");
+        }
+    }
+}

examples/VariantAndAzureMonitorDemo/Pages/RandomizeUser.cshtml

@@ -0,0 +1,4 @@
+@page
+@model VariantAndAzureMonitorDemo.Pages.RandomizeUserModel
+@{
+}

examples/VariantAndAzureMonitorDemo/Pages/RandomizeUser.cshtml.cs

@@ -0,0 +1,26 @@
+using Microsoft.AspNetCore.Authentication;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using System.Security.Claims;
+
+namespace VariantAndAzureMonitorDemo.Pages
+{
+    public class RandomizeUserModel : PageModel
+    {
+        public IActionResult OnGet()
+        {
+            // Generate new user claim
+            var claims = new List<Claim>
+            {
+                new Claim(ClaimTypes.Name, Random.Shared.Next().ToString())
+            };
+
+            var identity = new ClaimsIdentity(claims, "CookieAuth");
+            var principal = new ClaimsPrincipal(identity);
+
+            HttpContext.SignInAsync("CookieAuth", principal);
+
+            return RedirectToPage("/Index");
+        }
+    }
+}