Query Params passed in the endpoint URL are ignored (or) dropped

[leelabysani]

Problem Statement

When setting an explicit OTLP metrics endpoint URL using WithEndpointURL or OTEL_EXPORTER_OTLP_ENDPOINT or OTEL_EXPORTER_OTLP_METRICS_ENDPOINT, any query parameters passed along in the URL are dropped or ignored. This makes it impossible to send query parameters to an endpoint which has a must requirement.

Proposed Solution

We should implement an API which accepts query parameters called WithQueryParams() and if there are any query parameters passed in the endpoint URL, we should save them and use it during URL construction.

Alternatives

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Prior Art

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Additional Context

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[MrAlias]

https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/protocol/exporter.md#configuration-options

Endpoint (OTLP/HTTP): Target URL to which the exporter is going to send spans, metrics, or logs.
The implementation MUST honor the following URL components:

• scheme (http or https)
• host
• port
• path

The implementation MAY ignore all other URL components.

The current implementation is compliant with the specification. We do not plan to change our implementation based on the current state of the specification.