Ruby example span profiles not working

[nateberkopec]

Describe the bug

AFAICT span profiles/Tempo connection isn't working in the Ruby language example.

To Reproduce

Steps to reproduce the behavior:

1. Start the Ruby rideshare example.
2. I should see some traces in Explore -> Tempo, e.g. with a blank query. I don't see anything.

Environment

Following instructions using docker compose.

[marcsanmi]

Hi, @nateberkopec,

Thanks for reporting this.

I believe this is because of the breaking change introduced in the latest tempo release where the Open-Telemetry Collector receiver will connect to localhost instead of all interfaces 0.0.0.0.

For more details see grafana/tempo#4465.

I'd say is just a matter of updating tempo.yml. I'll work on this since it might affect other examples.

[marcsanmi]

Closing this since it was already fixed in #3855. Feel free to reopen if something arises.

[nateberkopec]

After this change, I no longer see Tempo in the Explore tab or under Data Sources.

I also see in the logs:

eu-north-1        | I, [2025-01-22T03:24:45.547374 #7]  INFO -- : [357620f4-89c5-4436-8a60-d69f631909e0] Processing by CarController#index as */*
ap-south-1        | E, [2025-01-22T03:24:46.682577 #7] ERROR -- : OpenTelemetry error: unexpected error in Jaeger::CollectorExporter#export - Failed to open TCP connection to localhost:14268 (Connection refused - connect(2) for "localhost" port 14268)
ap-south-1        | E, [2025-01-22T03:24:46.682603 #7] ERROR -- : OpenTelemetry error: Unable to export 9 spans
eu-north-1        | E, [2025-01-22T03:24:46.837973 #7] ERROR -- : OpenTelemetry error: unexpected error in Jaeger::CollectorExporter#export - Failed to open TCP connection to localhost:14268 (Connection refused - connect(2) for "localhost" port 14268)
eu-north-1        | E, [2025-01-22T03:24:46.938776 #7] ERROR -- : OpenTelemetry error: Unable to export 3 spans

[nateberkopec]

FWIW I would also be happy to try this out on play.grafana.org, but the Tempo connection there seems to only be setup for the Go rideshare demo.

[benedictfischer09]

Looking at the docker-compose.yml file for the Pyroscope Ruby rideshare example it doesn't look like tempo is included as a service in that example

However, Pyroscope is included in the tracing example https://github.com/grafana/pyroscope/tree/main/examples/tracing/ruby

When I followed that readme I was able to test out the Span Profiles functionality in Tempo