[Feature]: add namespace in metadata enrich function

[LorenzoTettamanti]

Is your feature request related to a problem?

• Yes

Problem Description:

Right now containers are divided by pod name. In kubernetes environements namespaces are used to provide multi-tenancy resource isolation. For example a single workload can be isolated in a dedicated namespace

Solution:

• Update the enrich function in common/metadata.rs to add the namespace to all the events

Additional info:

no additional info

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