Allow customization of retry error codes in OTLP grpc exporter

[kasium]

Is your feature request related to a problem?

We use a backend for the OTLP grpc exporter which tends to sends a 500 response if its overloaded. While this does not follow the best practice, we would like to retry 500 error codes.

Describe the solution you'd like

Allow customization of the _RETRYABLE_ERROR_CODES

opentelemetry-python/exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py

Lines 110 to 120 in 0e31c12

	_RETRYABLE_ERROR_CODES = frozenset(
	[
	StatusCode.CANCELLED,
	StatusCode.DEADLINE_EXCEEDED,
	StatusCode.RESOURCE_EXHAUSTED,
	StatusCode.ABORTED,
	StatusCode.OUT_OF_RANGE,
	StatusCode.UNAVAILABLE,
	StatusCode.DATA_LOSS,
	]
	)

Describe alternatives you've considered

Improve the exporter

Additional Context

No response

Would you like to implement a fix?

Yes

Tip

_{React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it. Learn more here.}