Configure Apache Pulsar geo-replication at the namespace level and verify cross-cluster message delivery

Steps

1. Register each cluster in the global metadata store: bin/pulsar-admin clusters create us-east --url http://broker-us-east:8080 --broker-url pulsar://broker-us-east:6650
2. Create a tenant that is allowed to use both clusters: bin/pulsar-admin tenants create my-tenant --allowed-clusters us-east,eu-west
3. Create or update the namespace with geo-replication enabled: bin/pulsar-admin namespaces set-clusters my-tenant/my-namespace --clusters us-east,eu-west
4. Verify replication by producing to a topic on us-east and consuming on eu-west; the replication cursor (a managed cursor named 'pulsar.repl.eu-west') tracks replication progress
5. Monitor replication lag: bin/pulsar-admin topics stats persistent://my-tenant/my-namespace/orders and check the replicationBacklog field per connected cluster
6. To exclude specific topics from replication set the namespace replication policy at topic level: bin/pulsar-admin topics set-replication-clusters --clusters us-east persistent://my-tenant/my-namespace/local-only-topic