Fix metrics config setup for source controller

[aavarghese]

{"severity":"ERROR","timestamp":"2021-01-27T17:31:31.7621829Z","logger":"redis-stream-source","caller":"metrics/exporter.go:148","message":"Failed to get a valid metrics config","error":"metrics domain cannot be empty","logging.googleapis.com/labels":{},"logging.googleapis.com/sourceLocation":{"file":"knative.dev/pkg@v0.0.0-20210119162123-1bbf0a6436c3/metrics/exporter.go","line":"148","function":"knative.dev/pkg/metrics.UpdateExporter"},"stacktrace":"knative.dev/pkg/metrics.UpdateExporter\n\tknative.dev/pkg@v0.0.0-20210119162123-1bbf0a6436c3/metrics/exporter.go:148\nknative.dev/eventing/pkg/adapter/v2.MainWithInformers\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:131\nknative.dev/eventing/pkg/adapter/v2.MainWithEnv\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:105\nknative.dev/eventing/pkg/adapter/v2.MainWithContext\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:80\nknative.dev/eventing/pkg/adapter/v2.Main\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:76\nmain.main\n\tknative.dev/eventing-redis/source/cmd/receive_adapter/main.go:26\nruntime.main\n\truntime/proc.go:204"}
{"severity":"ERROR","timestamp":"2021-01-27T17:31:31.7622881Z","logger":"redis-stream-source","caller":"v2/main.go:132","message":"failed to create the metrics exporter{error 26 0  metrics domain cannot be empty}","logging.googleapis.com/labels":{},"logging.googleapis.com/sourceLocation":{"file":"knative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go","line":"132","function":"knative.dev/eventing/pkg/adapter/v2.MainWithInformers"},"stacktrace":"knative.dev/eventing/pkg/adapter/v2.MainWithInformers\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:132\nknative.dev/eventing/pkg/adapter/v2.MainWithEnv\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:105\nknative.dev/eventing/pkg/adapter/v2.MainWithContext\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:80\nknative.dev/eventing/pkg/adapter/v2.Main\n\tknative.dev/eventing@v0.20.1-0.20210120133253-5dc363dcb5be/pkg/adapter/v2/main.go:76\nmain.main\n\tknative.dev/eventing-redis/source/cmd/receive_adapter/main.go:26\nruntime.main\n\truntime/proc.go:204"}

Install source, and an instance of redis stream source. These error message appears in the logs.
Reference: #68 (comment)

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[aavarghese]

/remove-lifecycle stale

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[aavarghese]

/remove-lifecycle stale

[github-actions]

This issue is stale because it has been open for 90 days with no
activity. It will automatically close after 30 more days of
inactivity. Reopen the issue with /reopen. Mark the issue as
fresh by adding the comment /remove-lifecycle stale.

[aavarghese]

/reopen

[knative-prow-robot]

@aavarghese: Reopened this issue.

Details

In response to this:

/reopen

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