[exporter/otlp] Attempts to parse port from unix socket endpoint and fails

[jsternberg]

Component(s)

exporter/otlp

What happened?

Describe the bug

An attempt to use a unix socket endpoint returns an error saying the port is invalid.

Steps to reproduce

Add the following configuration:

exporters:
    otlp:
        endpoint: unix:///my/unix/socket.sock
        tls:
            insecure: true

What did you expect to see?

I expected it to use the unix socket.

What did you see instead?

invalid configuration: exporters::otlp: invalid port "///tmp/B2604682329/exporter.grpc.sock"

Collector version

v0.135.0

Additional context

This configuration worked previously. We're attempting to upgrade from a version that used v0.92 to the latest and this now seems to no longer work. I'm not sure how else to configure the exporter to use a Unix socket.

Seems to be related to this change: #9632

Tip

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[yumosx]

HI @open-telemetry/collector-approvers can i help with it? I've handled the same issue in another project.