[exporter/prometheus] TestPrometheusExporter failing

[crobert-1]

Component(s)

exporter/prometheus

Describe the issue you're reporting

Failing action link

Failure output:

=== Failed
=== FAIL: . TestPrometheusExporter (0.00s)
    prometheus_test.go:84: 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/exporter/prometheusexporter/prometheus_test.go:84
        	Error:      	Received unexpected error:
        	            	listen tcp 127.0.0.1:8999: bind: address already in use
        	Test:       	TestPrometheusExporter

=== FAIL: . TestPrometheusExporter (re-run 1) (0.00s)
    prometheus_test.go:84: 
        	Error Trace:	/home/runner/work/opentelemetry-collector-contrib/opentelemetry-collector-contrib/exporter/prometheusexporter/prometheus_test.go:84
        	Error:      	Received unexpected error:
        	            	listen tcp 127.0.0.1:8999: bind: address already in use
        	Test:       	TestPrometheusExporter

DONE 2 runs, 78 tests, 2 failures in 125.[68](https://github.com/open-telemetry/opentelemetry-collector-contrib/actions/runs/14044066571/job/39320708322?pr=38884#step:7:69)1s
make[2]: *** [../../Makefile.Common:101: test] Error 1
make[1]: *** [Makefile:256: exporter/prometheusexporter] Error 2

[github-actions]

Pinging code owners:

• exporter/prometheus: @Aneurysm9 @dashpole @ArthurSens

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[crobert-1]

Failed on arm, I'm adding the label but admittedly not sure if it's related.

[ArthurSens]

Oof, hardcoded port doesn't sound good. Valid bug 👍