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Buildx will stall when buildkit is configured with OTel but the OTel endpoint isn't available
Reproduction steps:
- Start buildkit with
OTEL_EXPORTER_OTLP_ENDPOINT
set to something (or otherwise enable OTLP tracing in some way). - Have that endpoint not exist (service is not running(.
- Run buildx to perform a build.
The build will stall at the end for approximately 20 seconds before it eventually exits.