workaround for bug/behaviour in otlp-metrics-exporter #26
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Checking if reading from an env returns the value undefined and assigning the string the value undefined, so the otlp-metrics doesn't crash until fix in the package is applied.
Worked locally for both services (no load/requests, but was reproducible on simple docker run).
Related issue: open-telemetry/opentelemetry-js#4541