Spanmetrics panel always returns no results

[flands]

Bug Report

Which version of the demo you are using? 1.10.0

Symptom

Spanmetrics panel always returns no results

What is the expected behavior?

Spanmetrics panel returns results - this was the case, at least, in version 1.7.0

What is the actual behavior?

Spanmetrics panel always returns no results

Reproduce

Download version 1.10.0 and run make start. Once started, open Grafana (http://localhost:8080/grafana) and navigate to Dashboards > Demo > Demo Dashboard. Look at the panels under Spanmetrics. Switch to any other service and the same behavior is experienced. If you scroll down, you will see most of the other panel work (some do not have logs today so those also return no results but for a different reason).

Additional Context

This appears to be a regression. A workaround is to manually edit each widget and for the query letter (A, B, C, etc) option settings, manually setting the Min step to something like 30s.