Aerospike prometheus exporter

Configured aerospike prometheus exporter 1.9.0 on Amazon Linux. From prometheus Targets page I can see all endpoints are up. However not able to see the metrics like aerospike_namespace_memory_free_pct. None of the metrics related to namespace memory are available. Below snapshot lists available metrics starts with aerospike_namespace_me in prometheus:

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memory_free_pct was removed in server version 7.0, are you running 7.x?

Check for all the changes here: Aerospike Database 7.0 Release Notes | Aerospike Documentation