[Middleware APM Troubleshooting Guide]: the SDK is configured for a host-based setup but there is no Middleware agent listening locally. If you run host-based, install and run the Middleware Agent. If you are on serverless or containers, configure the APM SDK to send data directly to Middleware servers instead of the loopback address. In Docker, host-level metrics should go through the mw-host-agent sidecar image rather than embedding the agent install in the app container.

Context: The OTel exporter logs 'Transient error StatusCode.UNAVAILABLE encountered while exporting logs to the loopback address, retrying' and no telemetry appears.

## Matched source
Source: Source: https://docs.middleware.io/apm-configuration/troubleshooting
Original query: "Middleware.io APM: StatusCode.UNAVAILABLE exporting to the loopback address"
Key terms: address, exporting, loopback, middleware, statuscode, unavailable