1. Proposed title of this feature request
Cluster-scope instrumentation settings

2. What is the nature and description of the request?
Ability to set some parameters, especially the image parameter, of the Instrumentation custom resources at the cluster level.

3. Why does the customer need this? (List the business requirements here)
Some users are maintaining internally a list of instrumentation images with their own prefered version of instrumentation libraries.
They have hundreds of namespaces on which they would need to create an Instrumentation object to set the path to their preferred instrumentation images.
Thus it would make sense to have a cluster CR like ClusterInstrumentation to set default values of Instrumentation images listed in https://github.com/openshift/open-telemetry-opentelemetry-operator/blob/main/main.go#L127-L136, keeping the possibility of per namespace overrides.

4. List any affected packages or components.
https://docs.openshift.com/container-platform/4.14/otel/otel-instrumentation.html

Instrumentation, Opentelemetry