Meridian.Observability 1.0.0

.NET 10.0 This package targets .NET 10.0. The package is compatible with this framework or higher. 
dotnet add package Meridian.Observability --version 1.0.0
                    


                    

                
NuGet\Install-Package Meridian.Observability -Version 1.0.0
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package. 
<PackageReference Include="Meridian.Observability" Version="1.0.0" />
For projects that support PackageReference, copy this XML node into the project file to reference the package. 
<PackageVersion Include="Meridian.Observability" Version="1.0.0" />
                    


                            Directory.Packages.props
                        

                    

                
<PackageReference Include="Meridian.Observability" />
                    


                            Project file
For projects that support Central Package Management (CPM), copy this XML node into the solution Directory.Packages.props file to version the package. 
paket add Meridian.Observability --version 1.0.0
                    


                    

                
#r "nuget: Meridian.Observability, 1.0.0"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package. 
#:package Meridian.Observability@1.0.0
#:package directive can be used in C# file-based apps starting in .NET 10 preview 4. Copy this into a .cs file before any lines of code to reference the package. 
#addin nuget:?package=Meridian.Observability&version=1.0.0
                    


                            Install as a Cake Addin
                        

                    

                
#tool nuget:?package=Meridian.Observability&version=1.0.0
                    


                            Install as a Cake Tool

Meridian.Observability

Independent open-source project; not affiliated with or endorsed by Microsoft.

Domain-shaped tracing, metrics, and evaluation for .NET AI applications — one ActivitySource and one Meter shared across every Meridian subsystem, so a host wires one OpenTelemetry exporter and gets request counts, token usage, latency, and retrieval hit counts out of the box, not just generic HTTP metrics.

Part of Meridian — an opinionated .NET 10 AI framework built on the Microsoft Agent Framework, reachable from modern .NET apps directly and from COM-based applications (VB6, Visual FoxPro, Delphi, VBA) through a COM Callable Wrapper.

Install

dotnet add package Meridian.Observability

Example

using Meridian.Observability.Tracing;
using Meridian.Observability.Metrics;

// Register once, wherever you set up OpenTelemetry:
services.AddOpenTelemetry()
    .WithTracing(t => t.AddSource(MeridianTelemetry.SourceName))
    .WithMetrics(m => m.AddMeter(MeridianMetrics.MeterName));

// Meridian.Models and Meridian.Agents emit spans/metrics against these automatically when
// ModelOptions.Pipeline.EnableOpenTelemetry / MeridianAgentOptions.EnableTracing are set --
// nothing further to call yourself.

using Meridian.Observability.Evaluation;

public sealed class ContainsApologyEvaluator : ITextEvaluator {
    public string Name => "contains-apology";

    public Task<EvaluationResult> EvaluateAsync(string output, CancellationToken cancellationToken = default) {
        var passed = output.Contains("sorry", StringComparison.OrdinalIgnoreCase);
        return Task.FromResult(new EvaluationResult(Name, passed, passed ? 1 : 0));
    }
}

What each piece does

Type Role
MeridianTelemetry.SourceName / .ActivitySource The well-known ActivitySource name ("Meridian") Models/Agents pass to UseOpenTelemetry(); register it once with AddSource(...) to see every subsystem's spans
MeridianMetrics A shared Meter ("Meridian") plus Requests, Tokens, Latency, and RetrievalHits instruments, tagged with provider/outcome/operation/kind
IEvaluator<TInput, TOutput> / ITextEvaluator The evaluation abstraction — scores a model/agent output against a rubric, returning pass/fail plus a numeric score and explanation. Implement it for exact-match, keyword coverage, LLM-as-judge, or a third-party eval SDK
KeywordPresenceEvaluator, TextLengthEvaluator Small built-in ITextEvaluators, useful as examples or for simple checks

Full documentation

See the Meridian repository for the complete framework — multi-provider models, hybrid RAG, agents and long-term memory, image generation, and the COM bridge for VB6/Visual FoxPro/Delphi/VBA.

License

MIT © Angel Hernandez

Product Compatible and additional computed target framework versions.
.NET net10.0 is compatible.  net10.0-android was computed.  net10.0-browser was computed.  net10.0-ios was computed.  net10.0-maccatalyst was computed.  net10.0-macos was computed.  net10.0-tvos was computed.  net10.0-windows was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (3)

Showing the top 3 NuGet packages that depend on Meridian.Observability:

Package Downloads
Meridian.Knowledge

Embeddings, a pluggable semantic store, and retrieval (RAG) built on top of Meridian.Models.
Meridian.Agents

Agent construction, tools, memory and sequential/parallel workflows, built on the Microsoft Agent Framework (MAF).
Meridian.Hosting

The services.AddMeridian(...) front door: wires Models, Knowledge, Agents and Observability into an IServiceCollection with one opinionated, fluent builder.

GitHub repositories

This package is not used by any popular GitHub repositories.

Version Downloads Last Updated
1.0.0 130 10/13/2026