Can not export traces from opentelemetry collector to APM Server: request to https://apm.<removed>:8200/v1/traces responded with HTTP Status Code 400

It appears that we're not handling the otel-collector's default compression properly: OTLP/HTTP requests fail on compressed payloads · Issue #9036 · elastic/apm-server · GitHub

Until that is fixed, you can work around this by adding compression: none in the otlphttp config block.

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