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Container telemetry not shown in AppHost dashboard #4131

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@paulomorgado

Description

@paulomorgado

In preview 5, adding .WithOtlpExporter() to .AddContainer(...) would show OpenTelemetry logs, traces and metrics in the dashboard.

Since preview 6 this doesn't happen.

But if I had a dashboard container (mcr.microsoft.com/dotnet/aspire-dashboard or mcr.microsoft.com/dotnet/nightly/aspire-dashboard:8.0-preview):

var aspireDashboard = builder.AddContainer(
    "aspire-dashboard",
    "mcr.microsoft.com/dotnet/aspire-dashboard",
    "8.0-preview")
    .WithEndpoint(targetPort: 18888, port: 5018, name: "dash", scheme: "http", isProxied: true)
    .WithEndpoint(targetPort: 18889, port: 5019, name: "otel", scheme: "http", isProxied: true)
    .WithEnvironment("DOTNET_DASHBOARD_UNSECURED_ALLOW_ANONYMOUS", "true")
    .WithEnvironment("ASPIRE_ALLOW_UNSECURED_TRANSPORT", "true")
    .WithEnvironment("DASHBOARD__OTLP__AUTHMODE", "ApiKey")
    .WithEnvironment("DASHBOARD__OTLP__PRIMARYAPIKEY", builder.Configuration["AppHost:OtlpApiKey"])
    ;
var service = builder.AddContainer(...)
    .WithEndpoint(targetPort: 8080, port: 5012, name: "http", scheme: "http")
    .WithEnvironment("OTEL_BLRP_SCHEDULE_DELAY", "1000")
    .WithEnvironment("OTEL_BSP_SCHEDULE_DELAY", "1000")
    .WithEnvironment("OTEL_METRIC_EXPORT_INTERVAL", "1000")
    .WithEnvironment("OTEL_TRACES_SAMPLER", "always_on")
    .WithEnvironment("OTEL_EXPORTER_OTLP_PROTOCOL", "grpc")
    .WithEnvironment("OTEL_SERVICE_NAME", "hub")
    .WithEnvironment("OTEL_RESOURCE_ATTRIBUTES", "service.instance.id=hub")
    .WithEnvironment("OTEL_EXPORTER_OTLP_HEADERS", $"x-otlp-api-key={builder.Configuration["AppHost:OtlpApiKey"]}")
    .WithEnvironment(ctx => ctx.EnvironmentVariables["OTEL_EXPORTER_OTLP_ENDPOINT"] = new HostUrl(hubAspireDashboard.GetEndpoint("otel").Url))
...

the dashboard from the aspireDashboard container show telemetry from the service container.

service container is referenced from other resources and references other resources without any issues.

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