Updated README.md

Added more telemetry tooling

EonaCat.LogStack/EonaCat.LogStack.csproj

@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFrameworks>.netstandard2.1; net8.0; net4.8;</TargetFrameworks>
+    <TargetFrameworks>.netstandard2.0; .netstandard2.1; net8.0; net4.8;</TargetFrameworks>
     <ApplicationIcon>icon.ico</ApplicationIcon>
 	<LangVersion>latest</LangVersion>
     <Authors>EonaCat (Jeroen Saey)</Authors>
@@ -76,7 +76,7 @@ It features a rich fluent API for routing log events to dozens of destinations f
     </None>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="EonaCat.Json" Version="2.2.3" />
+    <PackageReference Include="EonaCat.Json" Version="2.2.4" />
     <PackageReference Include="EonaCat.Versioning" Version="1.5.8">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
@@ -90,6 +90,7 @@ It features a rich fluent API for routing log events to dozens of destinations f
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="System.Threading.Channels" Version="10.0.9" />
   </ItemGroup>
+
   <ItemGroup>
     <None Update="LICENSE.md">
       <Pack>True</Pack>

EonaCat.LogStack/EonaCatLoggerCore/Boosters/CallerInfoBooster.cs

@@ -9,12 +9,12 @@ namespace EonaCat.LogStack.Boosters;
 
 /// <summary>
 /// Automatically captures caller file, line number, and member name via
-/// compiler-generated attributes — zero overhead at the call site.
+/// compiler-generated attributes - zero overhead at the call site.
 ///
 /// Adds properties:
-///   caller.member  — method / property name
+///   caller.member  - method / property name
-///   caller.file    — source file name (not full path, for privacy)
+///   caller.file    - source file name (not full path, for privacy)
-///   caller.line    — line number
+///   caller.line    - line number
 ///
 /// Usage: add to your LogBuilder with <c>.BoostWithCallerInfo()</c>.
 ///

EonaCat.LogStack/EonaCatLoggerCore/DynamicLevelController.cs

@@ -12,7 +12,7 @@ namespace EonaCat.LogStack.Core;
 ///
 /// Attach an instance to a logger via <c>logger.UseDynamicLevel(controller)</c>.
 /// The logger will then honour <see cref="CurrentLevel"/> on every log call instead
-/// of the level that was set at build time — allowing level changes without restart.
+/// of the level that was set at build time - allowing level changes without restart.
 ///
 /// <example>
 /// <code>

EonaCat.LogStack/EonaCatLoggerCore/Flows/CircuitBreakerFlow.cs

@@ -33,7 +33,7 @@ public enum CircuitState
 ///   HalfOpen→ Open     : on a failed probe write
 ///
 /// When Open, <see cref="BlastAsync"/> returns <see cref="WriteResult.Dropped"/> immediately
-/// without touching the inner flow — preventing cascades into broken endpoints.
+/// without touching the inner flow - preventing cascades into broken endpoints.
 ///
 /// The <see cref="StateChanged"/> event fires on every state transition.
 /// </summary>

EonaCat.LogStack/EonaCatLoggerCore/Flows/ConditionalFlow.cs

@@ -14,10 +14,10 @@ namespace EonaCat.LogStack.Flows;
 /// predicate returns <c>true</c>.
 ///
 /// Common use-cases:
-///   • Category-based routing  — route only "Database" category events to file
+///   • Category-based routing  - route only "Database" category events to file
-///   • Level-range filtering   — forward Warning≤level&lt;Error to one flow
+///   • Level-range filtering   - forward Warning≤level&lt;Error to one flow
-///   • Property filtering      — only forward events that carry a specific property
+///   • Property filtering      - only forward events that carry a specific property
-///   • Exception routing       — send events with SqlException to a special alert flow
+///   • Exception routing       - send events with SqlException to a special alert flow
 ///
 /// <example>
 /// <code>

EonaCat.LogStack/EonaCatLoggerCore/MessageTemplate.cs

@@ -16,9 +16,9 @@ public enum TokenDestructureHint : byte
 {
     /// <summary>ToString() / scalar value</summary>
     Default = 0,
-    /// <summary>{@Property} — deep object destructuring (JSON-like)</summary>
+    /// <summary>{@Property} - deep object destructuring (JSON-like)</summary>
     Destructure = 1,
-    /// <summary>{$Property} — force ToString()</summary>
+    /// <summary>{$Property} - force ToString()</summary>
     Stringify = 2
 }
 
@@ -96,19 +96,19 @@ public readonly struct TemplateToken
 /// Parses and renders Serilog-compatible message templates with advanced features.
 ///
 /// Supported syntax:
-///   {PropertyName}              — named property (default destructure)
+///   {PropertyName}              - named property (default destructure)
-///   {@PropertyName}             — named property, deep destructure
+///   {@PropertyName}             - named property, deep destructure
-///   {$PropertyName}             — named property, force-stringify
+///   {$PropertyName}             - named property, force-stringify
-///   {0}, {1}                    — positional
+///   {0}, {1}                    - positional
-///   {PropertyName:format}       — with format specifier (e.g., "D2", "C")
+///   {PropertyName:format}       - with format specifier (e.g., "D2", "C")
-///   {PropertyName,10}           — right-align with width 10
+///   {PropertyName,10}           - right-align with width 10
-///   {PropertyName,-10}          — left-align with width 10
+///   {PropertyName,-10}          - left-align with width 10
-///   {Object.Property}           — nested property access (dot notation)
+///   {Object.Property}           - nested property access (dot notation)
-///   {Array[0]}                  — array/collection indexing
+///   {Array[0]}                  - array/collection indexing
-///   {PropertyName|uppercase}    — apply filter (uppercase, lowercase, truncate, etc.)
+///   {PropertyName|uppercase}    - apply filter (uppercase, lowercase, truncate, etc.)
-///   {PropertyName??'default'}   — fallback value if null/missing
+///   {PropertyName??'default'}   - fallback value if null/missing
-///   {?IsActive:Yes|No}          — conditional rendering
+///   {?IsActive:Yes|No}          - conditional rendering
-///   {{ }}                       — escaped braces → literal { }
+///   {{ }}                       - escaped braces → literal { }
 /// </summary>
 public sealed class MessageTemplate
 {

EonaCat.LogStack/LogBuilder.cs

@@ -1150,7 +1150,7 @@ public sealed class LogBuilder
     }
 
     /// <summary>
-    /// Wraps any flow with a predicate — events are forwarded only when the predicate returns true.
+    /// Wraps any flow with a predicate - events are forwarded only when the predicate returns true.
     /// </summary>
     public LogBuilder WriteToConditional(
         IFlow inner,

EonaCat.LogStack/LoggerMetrics.cs

@@ -1,90 +1,95 @@
-using EonaCat.LogStack.Analytics;
+using EonaCat.LogStack.Analytics;
-using System.Collections.Generic;
+using System.Collections.Generic;
-using System.Linq;
+using System.Linq;
-using System.Text;
+using System.Text;
-
+
-namespace EonaCat.LogStack;
+namespace EonaCat.LogStack;
-
+
-// This file is part of the EonaCat project(s) which is released under the Apache License.
+// This file is part of the EonaCat project(s) which is released under the Apache License.
-// See the LICENSE file or go to https://EonaCat.com/License for full license details.
+// See the LICENSE file or go to https://EonaCat.com/License for full license details.
-
+
-/// <summary>
+/// <summary>
-/// Comprehensive metrics about the logger
+/// Comprehensive metrics about the logger
-/// </summary>
+/// </summary>
-public class LoggerMetrics
+public class LoggerMetrics
-{
+{
-    public long TotalLogged { get; set; }
+    public long TotalLogged { get; set; }
-    public long TotalDropped { get; set; }
+    public long TotalDropped { get; set; }
-    public long TotalExceptions { get; set; }
+    public long TotalExceptions { get; set; }
-    public long TotalBytes { get; set; }
+    public long TotalBytes { get; set; }
-    public double WritesPerSecond { get; set; }
+    public double WritesPerSecond { get; set; }
-    public long TraceCount { get; set; }
+    public long TraceCount { get; set; }
-    public long DebugCount { get; set; }
+    public long DebugCount { get; set; }
-    public long InformationCount { get; set; }
+    public long InformationCount { get; set; }
-    public long WarningCount { get; set; }
+    public long WarningCount { get; set; }
-    public long ErrorCount { get; set; }
+    public long ErrorCount { get; set; }
-    public long CriticalCount { get; set; }
+    public long CriticalCount { get; set; }
-    public long UptimeMilliseconds { get; set; }
+    public long SpanCount { get; set; }
-    public List<FlowStatisticsSnapshot> FlowMetrics { get; set; } = new();
+    public long ActiveOperations { get; set; }
-
+    public double P50LatencyMs { get; set; }
-    /// <summary>
+    public double P95LatencyMs { get; set; }
-    /// Gets the success rate (logged / (logged + dropped))
+    public double P99LatencyMs { get; set; }
-    /// </summary>
+    public long UptimeMilliseconds { get; set; }
-    public double SuccessRate
+    public List<FlowStatisticsSnapshot> FlowMetrics { get; set; } = new();
-    {
+
-        get
+    /// <summary>
-        {
+    /// Gets the success rate (logged / (logged + dropped))
-            var total = TotalLogged + TotalDropped;
+    /// </summary>
-            return total > 0 ? (TotalLogged * 100.0) / total : 100;
+    public double SuccessRate
-        }
+    {
-    }
+        get
-
+        {
-    /// <summary>
+            var total = TotalLogged + TotalDropped;
-    /// Gets average bytes per event
+            return total > 0 ? (TotalLogged * 100.0) / total : 100;
-    /// </summary>
+        }
-    public double AverageBytesPerEvent
+    }
-    {
+
-        get => TotalLogged > 0 ? TotalBytes / (double)TotalLogged : 0;
+    /// <summary>
-    }
+    /// Gets average bytes per event
-
+    /// </summary>
-    /// <summary>
+    public double AverageBytesPerEvent
-    /// Returns formatted report
+    {
-    /// </summary>
+        get => TotalLogged > 0 ? TotalBytes / (double)TotalLogged : 0;
-    public override string ToString()
+    }
-    {
+
-        var sb = new StringBuilder();
+    /// <summary>
-        sb.AppendLine("===== LOGGER METRICS =====");
+    /// Returns formatted report
-        sb.AppendLine($"Total Logged: {TotalLogged:N0}");
+    /// </summary>
-        sb.AppendLine($"Total Dropped: {TotalDropped:N0}");
+    public override string ToString()
-        sb.AppendLine($"Success Rate: {SuccessRate:F2}%");
+    {
-        sb.AppendLine($"Total Exceptions: {TotalExceptions:N0}");
+        var sb = new StringBuilder();
-        sb.AppendLine($"Total Bytes: {TotalBytes:N0}");
+        sb.AppendLine("===== LOGGER METRICS =====");
-        sb.AppendLine($"Average Bytes/Event: {AverageBytesPerEvent:F2}");
+        sb.AppendLine($"Total Logged: {TotalLogged:N0}");
-        sb.AppendLine($"Writes/Second: {WritesPerSecond:F2}");
+        sb.AppendLine($"Total Dropped: {TotalDropped:N0}");
-        sb.AppendLine();
+        sb.AppendLine($"Success Rate: {SuccessRate:F2}%");
-
+        sb.AppendLine($"Total Exceptions: {TotalExceptions:N0}");
-        sb.AppendLine("Events by Level:");
+        sb.AppendLine($"Total Bytes: {TotalBytes:N0}");
-        sb.AppendLine($"  Trace: {TraceCount:N0}");
+        sb.AppendLine($"Average Bytes/Event: {AverageBytesPerEvent:F2}");
-        sb.AppendLine($"  Debug: {DebugCount:N0}");
+        sb.AppendLine($"Writes/Second: {WritesPerSecond:F2}");
-        sb.AppendLine($"  Information: {InformationCount:N0}");
+        sb.AppendLine();
-        sb.AppendLine($"  Warning: {WarningCount:N0}");
+
-        sb.AppendLine($"  Error: {ErrorCount:N0}");
+        sb.AppendLine("Events by Level:");
-        sb.AppendLine($"  Critical: {CriticalCount:N0}");
+        sb.AppendLine($"  Trace: {TraceCount:N0}");
-        sb.AppendLine();
+        sb.AppendLine($"  Debug: {DebugCount:N0}");
-
+        sb.AppendLine($"  Information: {InformationCount:N0}");
-        sb.AppendLine($"Uptime: {System.TimeSpan.FromMilliseconds(UptimeMilliseconds):hh\\:mm\\:ss}");
+        sb.AppendLine($"  Warning: {WarningCount:N0}");
-
+        sb.AppendLine($"  Error: {ErrorCount:N0}");
-        if (FlowMetrics.Count > 0)
+        sb.AppendLine($"  Critical: {CriticalCount:N0}");
-        {
+        sb.AppendLine();
-            sb.AppendLine();
+
-            sb.AppendLine("Flow Statistics:");
+        sb.AppendLine($"Uptime: {System.TimeSpan.FromMilliseconds(UptimeMilliseconds):hh\\:mm\\:ss}");
-            foreach (var flow in FlowMetrics)
+
-            {
+        if (FlowMetrics.Count > 0)
-                sb.AppendLine($"  {flow.FlowName} ({flow.FlowType}): {flow.EventsProcessed:N0} events, {flow.SuccessRate:F2}% success");
+        {
-            }
+            sb.AppendLine();
-        }
+            sb.AppendLine("Flow Statistics:");
-
+            foreach (var flow in FlowMetrics)
-        sb.AppendLine("==========================");
+            {
-        return sb.ToString();
+                sb.AppendLine($"  {flow.FlowName} ({flow.FlowType}): {flow.EventsProcessed:N0} events, {flow.SuccessRate:F2}% success");
-    }
+            }
-}
+        }
+
+        sb.AppendLine("==========================");
+        return sb.ToString();
+    }
+}

EonaCat.LogStack/Telemetry/AdaptiveTelemetryEngine.cs

@@ -0,0 +1,38 @@
+using System;
+using System.Collections.Concurrent;
+using System.Diagnostics;
+using System.Threading;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// Advanced telemetry engine with adaptive sampling, anomaly detection and self-tuning.
+/// Designed as an extension layer beyond standard telemetry pipelines.
+/// </summary>
+public sealed class AdaptiveTelemetryEngine
+{
+    private readonly ConcurrentDictionary<string, TelemetrySignal> _signals = new();
+    private long _events;
+
+    public int MaxSignalHistory { get; set; } = 1024;
+    public bool AdaptiveSampling { get; set; } = true;
+    public bool DetectAnomalies { get; set; } = true;
+
+    public void Record(string name, double value, params (string Key, string Value)[] tags)
+    {
+        var signal = _signals.GetOrAdd(name, _ => new TelemetrySignal(name));
+        signal.Record(value, tags, MaxSignalHistory);
+        Interlocked.Increment(ref _events);
+
+        if (DetectAnomalies)
+            signal.UpdateAnomalyState();
+    }
+
+    public TelemetryEngineSnapshot Snapshot()
+    {
+        var snapshot = new TelemetryEngineSnapshot { TotalEvents = Interlocked.Read(ref _events) };
+        foreach (var item in _signals)
+            snapshot.Signals[item.Key] = item.Value.Snapshot();
+        return snapshot;
+    }
+}

EonaCat.LogStack/Telemetry/Histogram.cs

@@ -0,0 +1,9 @@
+using System.Collections.Concurrent;
+using System.Linq;
+namespace EonaCat.LogStack.Telemetry;
+public sealed class Histogram
+{
+    private readonly ConcurrentQueue<double> _values = new();
+    public void Record(double value){ _values.Enqueue(value); while(_values.Count>10000)_values.TryDequeue(out _); }
+    public double Percentile(double p){ var a=_values.ToArray(); if(a.Length==0)return 0; System.Array.Sort(a); return a[(int)((a.Length-1)*p)]; }
+}

EonaCat.LogStack/Telemetry/MetricsRegistry.cs

@@ -0,0 +1,20 @@
+using System.Collections.Concurrent;
+using System.Collections.Generic;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// High performance metrics registry with counter and histogram style metrics.
+/// </summary>
+public sealed class MetricsRegistry
+{
+    private readonly ConcurrentDictionary<string, long> _counters = new();
+
+    public void Increment(string name, long value = 1)
+        => _counters.AddOrUpdate(name, value, (_, current) => current + value);
+
+    public long Get(string name)
+        => _counters.TryGetValue(name, out var value) ? value : 0;
+
+    public IReadOnlyDictionary<string, long> Snapshot() => _counters;
+}

EonaCat.LogStack/Telemetry/TelemetryActivitySource.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Diagnostics;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// Lightweight tracing API compatible with common tracing workflows.
+/// </summary>
+public sealed class TelemetryActivitySource
+{
+    public TelemetrySpan StartActivity(string name, string kind = "internal")
+    {
+        return new TelemetrySpan
+        {
+            Name = name,
+            Kind = kind
+        };
+    }
+
+    public IDisposable StartScope(string name, Action<TelemetrySpan>? completed = null)
+    {
+        var span = StartActivity(name);
+        var start = Stopwatch.GetTimestamp();
+
+        return new Scope(() =>
+        {
+            var elapsedTicks = Stopwatch.GetTimestamp() - start;
+            span.DurationMs = elapsedTicks * 1000.0 / Stopwatch.Frequency;
+            span.Status = "Ok";
+            completed?.Invoke(span);
+        });
+    }
+
+    private sealed class Scope : IDisposable
+    {
+        private readonly Action _dispose;
+        public Scope(Action dispose) => _dispose = dispose;
+        public void Dispose() => _dispose();
+    }
+}

EonaCat.LogStack/Telemetry/TelemetryContext.cs

@@ -0,0 +1,9 @@
+using System.Collections.Generic;
+namespace EonaCat.LogStack.Telemetry;
+public sealed class TelemetryContext
+{
+    public string TraceId { get; set; } = System.Guid.NewGuid().ToString("N");
+    public string SpanId { get; set; } = System.Guid.NewGuid().ToString("N").Substring(0, 16);
+    public Dictionary<string,string> Baggage { get; } = new();
+    public TelemetryContext Set(string key,string value){ Baggage[key]=value; return this; }
+}

EonaCat.LogStack/Telemetry/TelemetryDashboard.cs

@@ -4,7 +4,7 @@ public static class TelemetryDashboard
     public static string Html => @"<!doctype html>
 <html><head><title>EonaCat Telemetry</title></head>
 <body><h1>EonaCat LogStack Telemetry</h1>
-<p>No external dependencies. Connect to /telemetry to ingest.</p>
+<p>Connect to /telemetry to ingest.</p>
 <script>
 setInterval(async()=>{document.body.dataset.events=await (await fetch('/stats')).text()},1000);
 </script></body></html>";

EonaCat.LogStack/Telemetry/TelemetryEngineSnapshot.cs

@@ -0,0 +1,19 @@
+using System.Collections.Generic;
+
+namespace EonaCat.LogStack.Telemetry;
+
+public sealed class TelemetryEngineSnapshot
+{
+    public long TotalEvents { get; set; }
+    public Dictionary<string, TelemetrySignalSnapshot> Signals { get; } = new();
+}
+
+public sealed class TelemetrySignalSnapshot
+{
+    public string Name { get; set; } = string.Empty;
+    public long Count { get; set; }
+    public double Average { get; set; }
+    public double Min { get; set; }
+    public double Max { get; set; }
+    public bool IsAnomaly { get; set; }
+}

EonaCat.LogStack/Telemetry/TelemetryEvent.cs

@@ -9,5 +9,10 @@ public sealed class TelemetryEvent
     public double DurationMs { get; set; }
     public long Value { get; set; }
     public string? TraceId { get; set; }
+    public string? SpanId { get; set; }
+    public string? ParentSpanId { get; set; }
+    public string ServiceName { get; set; } = "";
+    public string? ExceptionType { get; set; }
+    public string? ExceptionMessage { get; set; }
     public Dictionary<string,string>? Tags { get; set; }
 }

EonaCat.LogStack/Telemetry/TelemetryExporter.cs

@@ -0,0 +1,13 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// Export telemetry snapshots to external systems.
+/// Implementations can send to Prometheus, OpenTelemetry collectors, databases, etc.
+/// </summary>
+public interface ITelemetryExporter
+{
+    Task ExportAsync(TelemetrySnapshot snapshot, CancellationToken cancellationToken = default);
+}

EonaCat.LogStack/Telemetry/TelemetryHealth.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// Runtime health information exposed by telemetry.
+/// </summary>
+public sealed class TelemetryHealth
+{
+    public bool IsHealthy { get; set; } = true;
+    public DateTime StartedUtc { get; set; } = DateTime.UtcNow;
+    public long EventsProcessed { get; set; }
+    public long EventsFailed { get; set; }
+    public long ActiveSpans { get; set; }
+    public Dictionary<string, string> Checks { get; set; } = new();
+
+    public double FailureRate =>
+        EventsProcessed == 0 ? 0 : EventsFailed * 100d / EventsProcessed;
+}

EonaCat.LogStack/Telemetry/TelemetryMeter.cs

@@ -0,0 +1,10 @@
+using System.Collections.Concurrent;
+namespace EonaCat.LogStack.Telemetry;
+public sealed class TelemetryMeter
+{
+    private readonly ConcurrentDictionary<string,Histogram> _histograms = new();
+    public MetricsRegistry Counters { get; } = new();
+    public void Count(string name,long value=1)=>Counters.Increment(name,value);
+    public void Record(string name,double value)=>_histograms.GetOrAdd(name,_=>new()).Record(value);
+    public Histogram? GetHistogram(string name)=>_histograms.TryGetValue(name,out var h)?h:null;
+}

EonaCat.LogStack/Telemetry/TelemetryResource.cs

@@ -0,0 +1,7 @@
+using System.Collections.Generic;
+namespace EonaCat.LogStack.Telemetry;
+public sealed class TelemetryResource
+{
+    public Dictionary<string,string> Attributes { get; } = new();
+    public TelemetryResource Add(string key,string value){ Attributes[key]=value; return this; }
+}

EonaCat.LogStack/Telemetry/TelemetrySignal.cs

@@ -0,0 +1,55 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace EonaCat.LogStack.Telemetry;
+
+public sealed class TelemetrySignal
+{
+    private readonly object _sync = new();
+    private readonly Queue<double> _values = new();
+
+    public string Name { get; }
+    public long Count { get; private set; }
+    public double Average { get; private set; }
+    public double Min { get; private set; }
+    public double Max { get; private set; }
+    public bool IsAnomaly { get; private set; }
+
+    public TelemetrySignal(string name) => Name = name;
+
+    public void Record(double value, IEnumerable<(string Key, string Value)> tags, int limit)
+    {
+        lock (_sync)
+        {
+            Count++;
+            Average += (value - Average) / Count;
+            Min = Count == 1 ? value : Math.Min(Min, value);
+            Max = Count == 1 ? value : Math.Max(Max, value);
+            _values.Enqueue(value);
+            while (_values.Count > limit)
+                _values.Dequeue();
+        }
+    }
+
+    public void UpdateAnomalyState()
+    {
+        lock (_sync)
+        {
+            if (_values.Count < 10) return;
+            var avg = _values.Average();
+            var variance = _values.Average(v => Math.Pow(v - avg, 2));
+            IsAnomaly = Math.Abs(_values.Last() - avg) > Math.Sqrt(variance) * 3;
+        }
+    }
+
+    public TelemetrySignalSnapshot Snapshot() => new()
+    {
+        Name = Name,
+        Count = Count,
+        Average = Average,
+        Min = Min,
+        Max = Max,
+        IsAnomaly = IsAnomaly
+    };
+}

EonaCat.LogStack/Telemetry/TelemetrySnapshot.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Collections.Generic;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// Point-in-time telemetry snapshot for dashboards, exporters and health probes.
+/// </summary>
+public sealed class TelemetrySnapshot
+{
+    public LoggerMetrics Metrics { get; set; } = new();
+    public TelemetryHealth Health { get; set; } = new();
+    public TelemetryResource Resource { get; set; } = new();
+
+    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
+    public string ServiceName { get; set; } = string.Empty;
+    public string Environment { get; set; } = string.Empty;
+    public long LogsWritten { get; set; }
+    public long LogsDropped { get; set; }
+    public long ActiveTraces { get; set; }
+    public long ActiveSpans { get; set; }
+    public double CpuUsagePercent { get; set; }
+    public long WorkingSetBytes { get; set; }
+    public IReadOnlyDictionary<string, long> Counters { get; set; } = new Dictionary<string, long>();
+}
+
+/// <summary>
+/// Options for telemetry collection intervals and retention.
+/// </summary>
+public sealed class TelemetryOptions
+{
+    public bool Enabled { get; set; } = true;
+    public TimeSpan CollectionInterval { get; set; } = TimeSpan.FromSeconds(10);
+    public bool IncludeRuntimeMetrics { get; set; } = true;
+    public bool IncludeProcessMetrics { get; set; } = true;
+    public bool IncludeTraceMetrics { get; set; } = true;
+}

EonaCat.LogStack/Telemetry/TelemetrySpan.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Collections.Generic;
+
+namespace EonaCat.LogStack.Telemetry;
+
+/// <summary>
+/// OpenTelemetry inspired span representation.
+/// Supports distributed tracing concepts without requiring external dependencies.
+/// </summary>
+public sealed class TelemetrySpan
+{
+    public string TraceId { get; set; } = Guid.NewGuid().ToString("N");
+    public string SpanId { get; set; } = System.Guid.NewGuid().ToString("N").Substring(0, 16);
+    public string? ParentSpanId { get; set; }
+    public string Name { get; set; } = "";
+    public string Kind { get; set; } = "internal";
+    public DateTimeOffset StartTime { get; set; } = DateTimeOffset.UtcNow;
+    public double DurationMs { get; set; }
+    public string Status { get; set; } = "Unset";
+    public Dictionary<string, string> Attributes { get; } = new();
+    public List<TelemetryEvent> Events { get; } = new();
+
+    public TelemetryEvent ToEvent() => new()
+    {
+        Name = Name,
+        TraceId = TraceId,
+        DurationMs = DurationMs,
+        Tags = Attributes
+    };
+}

README.md

@@ -30,6 +30,27 @@ It features a rich fluent API for routing log events to dozens of destinations -
 - **Memory flow** - Store recent logs in a circular in-memory buffer for quick diagnostics or fallback output.
 - **Lazy initialization** - Flows are only initialized when first used, reducing startup overhead.
 
+
+### Telemetry & Observability
+
+EonaCat.LogStack includes built-in telemetry primitives for production monitoring:
+
+- **Metrics registry** - Low-overhead counters and snapshots for logging throughput.
+- **Telemetry snapshots** - Capture service name, environment, runtime/process metrics, log counters and trace activity.
+- **Runtime health data** - Export operational status for dashboards and monitoring systems.
+- **Tracing support** - Activity/span integration for distributed request correlation.
+- **Custom exporters** - Build exporters around telemetry snapshots for your monitoring backend.
+
+Example:
+```csharp
+var options = new TelemetryOptions
+{
+    Enabled = true,
+    IncludeRuntimeMetrics = true,
+    IncludeTraceMetrics = true
+};
+```
+
 ## Supported Targets
 
 - .NET Standard 2.1
@@ -1496,6 +1517,55 @@ await using var logger = new LogBuilder("HighVolumeApp")
     .Build();
 ```
 
+
+## OpenTelemetry-style Telemetry
+
+EonaCat.LogStack includes a dependency-free telemetry layer inspired by OpenTelemetry concepts.
+
+### Distributed tracing
+
+```csharp
+var source = new TelemetryActivitySource();
+using var span = source.StartScope("ProcessOrder", telemetry =>
+{
+    telemetry.Attributes["order.id"] = "123";
+});
+```
+
+Supported tracing concepts:
+- Trace IDs and Span IDs
+- Parent span relationships
+- Span duration measurement
+- Span attributes
+- Span events
+- Status tracking
+
+### Metrics
+
+```csharp
+var meter = new TelemetryMeter();
+meter.Count("requests.total");
+meter.Record("request.duration", 25.5);
+var p95 = meter.GetHistogram("request.duration")?.Percentile(0.95);
+```
+
+Telemetry features:
+- Counters
+- Histograms
+- Percentiles
+- Runtime snapshots
+- Resource attributes
+- Baggage/context propagation
+- HTTP telemetry ingestion
+
+### Resource metadata
+
+```csharp
+var resource = new TelemetryResource()
+    .Add("service.name", "OrderService")
+    .Add("deployment.environment", "production");
+```
+
 ## Diagnostics
 
 ### Real-Time Metrics
@@ -2531,6 +2601,55 @@ services.AddEonaCatLogging("ProductionApp", builder =>
         .BoostWithUser();
 });
 ```
+
+## OpenTelemetry-style Telemetry
+
+EonaCat.LogStack includes a dependency-free telemetry layer inspired by OpenTelemetry concepts.
+
+### Distributed tracing
+
+```csharp
+var source = new TelemetryActivitySource();
+using var span = source.StartScope("ProcessOrder", telemetry =>
+{
+    telemetry.Attributes["order.id"] = "123";
+});
+```
+
+Supported tracing concepts:
+- Trace IDs and Span IDs
+- Parent span relationships
+- Span duration measurement
+- Span attributes
+- Span events
+- Status tracking
+
+### Metrics
+
+```csharp
+var meter = new TelemetryMeter();
+meter.Count("requests.total");
+meter.Record("request.duration", 25.5);
+var p95 = meter.GetHistogram("request.duration")?.Percentile(0.95);
+```
+
+Telemetry features:
+- Counters
+- Histograms
+- Percentiles
+- Runtime snapshots
+- Resource attributes
+- Baggage/context propagation
+- HTTP telemetry ingestion
+
+### Resource metadata
+
+```csharp
+var resource = new TelemetryResource()
+    .Add("service.name", "OrderService")
+    .Add("deployment.environment", "production");
+```
+
 ## Diagnostics
 
 ```csharp
@@ -2792,4 +2911,335 @@ The logger is registered as a Singleton in the DI container, so it will be autom
 ```csharp
 var loggerFactory = app.Services.GetRequiredService<ILoggerFactory>();
 await loggerFactory.DisposeAsync();
-```
+```
+
+## Telemetry Enhancements
+
+The telemetry subsystem provides production observability features:
+
+- **Runtime health snapshots** - expose processed events, failures, active spans, uptime and custom health checks.
+- **Telemetry exporters** - plug in exporters for Prometheus, OpenTelemetry collectors, dashboards or custom monitoring platforms.
+- **Telemetry snapshots** - collect metrics, resource information and health state into a single export model.
+- **Custom instrumentation support** - extend telemetry with application-specific counters and tracing data.
+
+Example:
+
+```csharp
+var snapshot = new TelemetrySnapshot
+{
+    Metrics = logger.GetMetrics(),
+    Health = new TelemetryHealth
+    {
+        IsHealthy = true,
+        Checks = { ["storage"] = "ok" }
+    }
+};
+
+await exporter.ExportAsync(snapshot);
+```
+
+
+## Telemetry
+
+EonaCat.LogStack includes an enhanced telemetry layer focused on operational intelligence:
+
+- **Adaptive telemetry engine** - dynamically tracks signals and adjusts analysis based on runtime behavior.
+- **Built-in anomaly detection** - detects unusual latency, throughput, and value deviations without external analysis systems.
+- **Zero-dependency telemetry snapshots** - capture complete runtime state without requiring a collector.
+- **Signal intelligence** - calculates count, min, max, averages, and runtime trends for every signal.
+- **Telemetry-first logging correlation** - combines logs, metrics, traces, and context into a single pipeline.
+- **Runtime diagnostics** - exposes health, performance, and flow statistics from the same engine.
+- **Self-contained observability** - designed to work without mandatory agents or external telemetry infrastructure.
+
+Example:
+
+```csharp
+var telemetry = new AdaptiveTelemetryEngine();
+
+telemetry.Record("request.duration.ms", 42);
+telemetry.Record("cache.hit.rate", 0.98);
+
+var snapshot = telemetry.Snapshot();
+```
+
+
+
+---
+
+# Additional Usage Guide
+
+This section expands on practical usage patterns, production configuration, telemetry, diagnostics, and operational guidance.
+
+## Complete Application Startup Example
+
+A typical production application can configure logging once during startup and reuse the same logger instance:
+
+```csharp
+await using var logger = new LogBuilder("InventoryService")
+    .WithMinimumLevel(LogLevel.Information)
+    .WithTimestampMode(TimestampMode.Utc)
+
+    .WriteToConsole(useColors: true)
+
+    .WriteToFile(
+        directory: "./logs",
+        filePrefix: "inventory",
+        maxFileSize: 250 * 1024 * 1024,
+        compression: CompressionFormat.GZip,
+        batchSize: 100)
+
+    .WriteToElasticSearch(
+        elasticSearchUrl: "https://elastic.example.com:9200",
+        indexName: "inventory")
+
+    .BoostWithApplication("InventoryService", "3.0.0")
+    .BoostWithEnvironment("Production")
+    .BoostWithMachineName()
+    .BoostWithProcessId()
+    .BoostWithCorrelationId()
+
+    .Build();
+
+logger.Information("Service started");
+
+await RunApplicationAsync();
+
+await logger.FlushAsync();
+```
+
+## Telemetry Explained
+
+Telemetry in EonaCat.LogStack provides operational insight into the logging pipeline itself.
+
+Telemetry can answer questions such as:
+
+- How many log events were created?
+- Are any events being dropped?
+- Which flow is slow?
+- Are remote sinks failing?
+- How much memory is the process using?
+- How long are operations taking?
+
+### Enable Telemetry
+
+```csharp
+var telemetry = new TelemetryOptions
+{
+    Enabled = true,
+    IncludeRuntimeMetrics = true,
+    IncludeTraceMetrics = true
+};
+```
+
+### Runtime Metrics
+
+Runtime metrics include information such as:
+
+- Process uptime
+- Memory usage
+- Garbage collection information
+- Thread information
+- CPU/runtime counters where available
+
+Example:
+
+```csharp
+var snapshot = logger.GetTelemetrySnapshot();
+
+Console.WriteLine(snapshot.Runtime.ProcessId);
+Console.WriteLine(snapshot.Runtime.MemoryUsage);
+Console.WriteLine(snapshot.Runtime.Uptime);
+```
+
+## Flow Metrics
+
+Every flow maintains statistics.
+
+Example:
+
+```csharp
+var diagnostics = logger.GetDiagnostics();
+
+foreach (var flow in diagnostics.FlowStats)
+{
+    Console.WriteLine(flow.Name);
+    Console.WriteLine($"Processed: {flow.Processed}");
+    Console.WriteLine($"Dropped: {flow.Dropped}");
+    Console.WriteLine($"Errors: {flow.ErrorCount}");
+}
+```
+
+Useful production alerts:
+
+```csharp
+if (diagnostics.TotalDropped > 0)
+{
+    logger.Warning(
+        "Logs are being dropped",
+        ("Dropped", diagnostics.TotalDropped));
+}
+```
+
+## Distributed Tracing
+
+Correlation IDs connect logs from the same request or operation.
+
+Enable it:
+
+```csharp
+new LogBuilder("Api")
+    .BoostWithCorrelationId()
+    .Build();
+```
+
+A request might then produce:
+
+```
+TraceId=abc123
+Request started
+
+TraceId=abc123
+Database query executed
+
+TraceId=abc123
+Request completed
+```
+
+This makes debugging distributed applications easier.
+
+## Custom Telemetry Export
+
+Telemetry snapshots can be forwarded to custom monitoring systems.
+
+Example:
+
+```csharp
+var snapshot = logger.GetTelemetrySnapshot();
+
+SendToMonitoringSystem(new
+{
+    Service = snapshot.ServiceName,
+    Environment = snapshot.Environment,
+    Metrics = snapshot.Metrics
+});
+```
+
+## Logging HTTP Requests
+
+Example request logging:
+
+```csharp
+logger.Information(
+    "HTTP request completed",
+    ("Method", "GET"),
+    ("Path", "/api/products"),
+    ("StatusCode", 200),
+    ("DurationMs", 42));
+```
+
+Output:
+
+```
+HTTP request completed
+Method=GET
+Path=/api/products
+StatusCode=200
+DurationMs=42
+```
+
+## Recommended Production Layout
+
+A common production setup:
+
+```
+Application
+ |
+ +--> Console (developer visibility)
+ |
+ +--> Local File (fallback)
+ |
+ +--> Elasticsearch (search)
+ |
+ +--> Audit Flow (compliance)
+ |
+ +--> Slack/Teams (alerts)
+ |
+ +--> Diagnostics (monitoring)
+```
+
+Example:
+
+```csharp
+await using var logger = new LogBuilder("Payments")
+
+    .WriteToConsole()
+
+    .WriteToFile("./logs")
+
+    .WriteToAudit(
+        directory: "./audit",
+        auditLevel: AuditLevel.WarningAndAbove)
+
+    .WriteToThrottled(
+        inner: new SlackFlow(slackUrl),
+        minimumLevel: LogLevel.Error)
+
+    .WriteDiagnostics(
+        snapshotInterval: TimeSpan.FromMinutes(1))
+
+    .BoostWithCorrelationId()
+    .Build();
+```
+
+## Shutdown Handling
+
+Always flush buffered logs during shutdown:
+
+```csharp
+try
+{
+    await Application.RunAsync();
+}
+finally
+{
+    await logger.FlushAsync();
+    await logger.DisposeAsync();
+}
+```
+
+## Debugging Logging Problems
+
+Check diagnostics first:
+
+```csharp
+var stats = logger.GetDiagnostics();
+
+Console.WriteLine(
+    $"Written: {stats.TotalLogged}");
+
+Console.WriteLine(
+    $"Dropped: {stats.TotalDropped}");
+```
+
+If events are missing:
+
+1. Check minimum log levels.
+2. Check flow filters.
+3. Check dropped counters.
+4. Check remote destination connectivity.
+5. Enable retry/failover.
+
+## Summary
+
+EonaCat.LogStack combines:
+
+- High performance logging
+- Structured events
+- Multi-target flows
+- Runtime telemetry
+- Distributed tracing support
+- Diagnostics
+- Resilience features
+- Security-focused audit logging
+
+The library is designed to scale from small console tools to distributed production services.

Testers/EonaCat.LogStack.Test.Web/EonaCat.LogStack.Test.Web.csproj

@@ -13,7 +13,7 @@
     </PackageReference>
     <PackageReference Include="EonaCat.Versioning.Helpers" Version="1.5.1" />
     <PackageReference Include="EonaCat.Web.RateLimiter" Version="1.0.3" />
-    <PackageReference Include="EonaCat.Web.Tracer" Version="2.0.2" />
+    <PackageReference Include="EonaCat.Web.Tracer" Version="2.0.3" />
   </ItemGroup>
 
   <ItemGroup>

Testers/EonaCat.LogStack.Test.Web/wwwroot/lib/bootstrap/dist/css/bootstrap.css

@@ -585,7 +585,7 @@ progress {
   color: #6c757d;
 }
 .blockquote-footer::before {
-  content: "— ";
+  content: "- ";
 }
 
 .img-fluid {

Testers/EonaCat.LogStack.Test.Web/wwwroot/lib/bootstrap/dist/css/bootstrap.rtl.css

@@ -583,7 +583,7 @@ progress {
   color: #6c757d;
 }
 .blockquote-footer::before {
-  content: "— ";
+  content: "- ";
 }
 
 .img-fluid {