User-configurable overrides refuses span-metrics-size as valid processor

[yvrhdn]

Describe the bug When trying to update metrics_generator.processors through the user-configurable overrides, when the array contains the processor span-metrics-size, the request is rejected with metrics_generator.processor "span-metrics-size" is not a known processor, valid values: [service-graphs span-metrics local-blocks].

To Reproduce Steps to reproduce the behavior:

1. Start Tempo (SHA or version)
2. Update metrics_generator.processors through the user-configurable overrides

Expected behavior span-metrics-size is a valid subprocessor of the span-metrics processor and should be accepted.

Environment: N/A

Additional Context

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[vijal-patel]

@kvrhdn I've started working on this and I'd like to confirm if I should add support for the other spanmetrics sub processors (span-metrics-latency, span-metrics-count) in addition to span-metrics-size

[yvrhdn]

Yes that's right. We should also allow all of the subprocessors defined here: https://github.com/grafana/tempo/blob/main/modules/generator/processor/spanmetrics/subprocessors.go