Trace ingestion straight to Tempo cloud saas without a collector

[giuliohome]

In principle, I should be able to send a trace to Grafana cloud Tempo (saas) without the collector (even if - agreed of course - if it is better to use the agent or the collector).

But a code like this

no_otel_collector_url = "https://tempo-eu-west-0.grafana.net"
otlp_exporter = OTLPSpanExporter(endpoint=no_otel_collector_url, headers={"authorization": "Basic myencodedtoken")

correctly passing the authentication, still results in no trace shown on grafancloud explore search.
I assume this aspect is related to Grafana cloud and specifically to Tempo Traces ingestion, am I correct? ... that having said, I wonder why the trace sent straight to grafana cloud from my python code without the collector is silently dropped... Indeed, no error code is returned (as it would happen with a wrong token or a wrong auth key instead), hence I'd had expected to find the trace in Grafana Tempo viewer...

Originally posted by @giuliohome in grafana/agent#1977 (comment)

[giuliohome]

Tested with .NET and it does work, source shown below, there must be something in python code... (will have to dig into it by myself, but the issue here can be closed atm)

            services.AddOpenTelemetryTracing(
                (builder) => builder
                    //https://github.com/open-telemetry/opentelemetry-dotnet/blob/main/docs/trace/customizing-the-sdk/README.md
                    .AddSource("ExampleTracer")
                    .SetResourceBuilder(ResourceBuilder.CreateDefault()
                        .AddService("ServiceA"))
                    // Instrument HttpClient calls and pass on context
                    .AddHttpClientInstrumentation()
                    .AddAspNetCoreInstrumentation()
                    .AddConsoleExporter()
                    .AddOtlpExporter(o =>
                    {
                        o.Endpoint = new Uri("https://tempo-eu-west-0.grafana.net"); //"http://otel-collector:4317");
                        string token = "myencodedtoken";
                        o.Headers = $"Authorization=Basic {token}";
                        o.ExportProcessorType = ExportProcessorType.Simple;
                    }));

        }

for .net part, all the rest can be taken from https://github.com/benbhall/jaeger-opentelemetry-dotnet with otel-collector commented out from docker-compose.yml and Startup.cs modified as shown here above.

[giuliohome]

Solved also for python by upgrade the version from 1.11 to 1.12!

pip install --upgrade opentelemetry-exporter-otlp
pip install --upgrade opentelemetry-sdk