middleware errors not logged

[Theodus]

I have encountered situations that are unnecessarily difficult to debug because an error result from a middleware function is neither reported in the response body nor logged via tracing. For example, when the attestation_middleware returns AttestationError::CouldNotFindSigner the response just has status 500 with no body explaining what went wrong and there are no logs indicating an issue:

  2025-02-11T15:43:29.023335Z  INFO indexer_service_rs::metrics: Serving prometheus metrics, address: 0.0.0.0:7300
    at crates/service/src/metrics.rs:39

  2025-02-11T15:43:29.023364Z  INFO indexer_service_rs::service: Serving requests, address: 0.0.0.0:7601
    at crates/service/src/service.rs:123

Only after building the indexer-service from source with additional logging was I able to discover where in the pile of middleware something went wrong. There should be logs for middleware errors.