Adds Papst.EventStore.OpenTelemetry — a new extension library that instruments all EventStore and EventStream operations with System.Diagnostics.ActivitySource-based tracing, compatible with any OpenTelemetry collector without requiring the OTel SDK as a dependency.

Design

• Decorator pattern — three internal decorators wrap IEventStore, IEventStream, and IEventStoreTransactionAppender, adding activities around every operation with relevant tags (event_store.stream_id, event_store.event_type, event_store.event_id, etc.) and recording exceptions as ActivityStatusCode.Error
• Works with all store implementations — InMemory, MongoDB, CosmosDB, EF Core, FileSystem; call AddEventStoreInstrumentation() after registering any store

Usage

services.AddInMemoryEventStore()
        .AddEventRegistrationTypeProvider()
        .AddEventStoreInstrumentation(); // wraps the registered IEventStore transparently

// Wire up in your OTel pipeline:
tracerProviderBuilder.AddSource(EventStoreActivitySource.SourceName); // "Papst.EventStore"

Activity coverage

• Fixes Open Telemetry Compatability #264

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