Add Opentelemetry support

[Bjego]

Hey, I've seen your FakeSMTP project. You are using classic logging for now. Please add Opentelemetry and ApplicationInsights support. You can either add it via serilog or the better approach - remove serilog and replace it with otel.

Thanks in advance

[rnwood]

What's the use case here?

[Bjego]

Hi @rnwood , when you would add Opentelemetry, the logs and apicalls from smtp4dev would appear in the global log / metric / trace landscape of the distributed systems. You could track the connections between the clients, mailkit and smtp4dev. It so it helps spotting issues in a distributed system and when you use aspire - opentelemetry is a build in feature for tracking dependencies between the systems / services.