Support for OpenTelemetry Auto-Instrumentation

[justurbo]

✅ Using the OpenTelemetry.AutoInstrumentation package I expect to receive traces of Mongo queries.

❌ However, I do not see Mongo traces in the request trace.

Here's how I initialize Mongo Diagnostics:

private readonly MongoClient _client = new(
    new MongoClientSettings
    {
        ...
        ClusterConfigurator = clusterBuilder => clusterBuilder.Subscribe(
            new DiagnosticsActivityEventSubscriber(
                new InstrumentationOptions
                {
                    CaptureCommandText = true,
                    ShouldStartActivity = @event => !"collectionToIgnore".Equals(@event.GetCollectionName())
                }
            )
        )
    }
);

However, the OpenTelemetry traces of Mongo do not appear as a part of the request in the Grafana Tempo dashboard:

[justurbo]

@jbogard Am I missing a critical step of the setup which transforms Mongo diagnostics into traces consumable by OpenTelemetry? Thanks! 🙏

[jbogard]

Those diagnostic traces are ready to be consumed by OTel. But you need to explicitly turn them on in your collector though. Here's an Aspire example:

https://github.com/jbogard/nsb-diagnostics-poc/blob/master/ServiceDefaults/Extensions.cs#L67