Try setting nats_instance_group
Try setting nats_instance_group

Cf-deployment might have missed out on setting the property.

See https://cloudfoundry.slack.com/archives/C2U7KA7M4/p1650479647871229?thread_ts=1649696460.972319&cid=C2U7KA7M4
https://github.com/cloudfoundry/metrics-discovery-release/pull/7

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