fix grafana-dash-knative-eventing-channel query for kafkachannels

[maschmid]

kn_eventing_dispatch_latency_ms_count has kn_kafkachannel_namespace ,
kn_eventing_dispatch_duration_seconds_count has kn_channel_namespace

So when using just kn_channel_namespace labels, we don't see the kafkachannel namespaces.

Use label_replace to rename the kn_kafkachannel_namespace labels to kn_channel_namespace for the namespace query.

• 🧹 fix grafana-dash-knative-eventing-channel query for kafkachannels

[openshift-ci]

@maschmid: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/421-mesh-upgrade	66f145a	link	false	/test 421-mesh-upgrade
ci/prow/420-kitchensink-upgrade	66f145a	link	false	/test 420-kitchensink-upgrade

Full PR test history. Your PR dashboard.

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[creydr]

Good catch

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, maschmid

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