otlp: implement collector types and exp backoff retry #47
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Reason for this PR
Follow up of #41 to add:
Closes #42
Details
Collector protobuf is added to the build to allow generating the types used in the
ExportXYZ
RPCs.Implement the retries as (partially) described in the OTel specs for the HTTP/protobuf protocol.
With this PR, we allow users to configure the behavior of HTTP retries when configuring the exporter, but not which status codes will be retried.
Related: open-telemetry/opentelemetry-specification#3639