Bug report

For bug reports, provide this information, please:

What Debezium connector do you use and what version?

Debezium Server with Postgres and Mongo version 2.7.0

What is the connector configuration?

Environment variable `JMX_EXPORTER_PORT=9799`

What is the captured database version and mode of depoyment?

on-premises, PostgreSQL

What behaviour do you expect?

Prometheus metrics to have a type

What behaviour do you see?

Prometheus metrics show `untyped`

Do you see the same behaviour using the latest relesead Debezium version?

Yes

Do you have the connector logs, ideally from start till finish?

It does not show up on logs

```

$ curl -s localhost:9799 | grep 'untyped'

1. TYPE kafka_producer_producer_metrics_failed_reauthentication_total untyped
2. TYPE kafka_producer_producer_metrics_request_rate untyped
3. TYPE kafka_producer_producer_metrics_requests_in_flight untyped
4. TYPE kafka_producer_producer_metrics_outgoing_byte_total untyped
5. TYPE java_nio_direct_count untyped
6. TYPE kafka_producer_producer_metrics_outgoing_byte_rate untyped
7. TYPE kafka_producer_producer_metrics_successful_reauthentication_total untyped
8. TYPE kafka_producer_producer_metrics_io_wait_time_ns_total untyped
9. TYPE kafka_producer_producer_metrics_request_latency_avg untyped
10. TYPE debezium_postgres_connector_metrics_totalnumberofeventsseen untyped
11. TYPE java_nio_mapped_count untyped
12. TYPE kafka_producer_producer_metrics_txn_init_time_ns_total untyped
13. TYPE debezium_postgres_connector_metrics_connected untyped
14. TYPE kafka_producer_producer_metrics_buffer_exhausted_rate untyped
15. TYPE kafka_producer_producer_metrics_record_send_total untyped
16. TYPE kafka_producer_app_info_start_time_ms untyped
17. TYPE kafka_producer_producer_metrics_connection_creation_total untyped
18. TYPE debezium_postgres_connector_metrics_totalnumberofdeleteeventsseen untyped
19. TYPE kafka_producer_producer_metrics_bufferpool_wait_time_total untyped
20. TYPE kafka_producer_producer_metrics_network_io_total untyped
21. TYPE kafka_producer_producer_metrics_record_retry_total untyped
22. TYPE kafka_producer_producer_topic_metrics_record_error_rate untyped
23. TYPE debezium_postgres_connector_metrics_snapshotpauseddurationinseconds untyped
24. TYPE debezium_postgres_connector_metrics_remainingtablecount untyped

```

How to reproduce the issue using our tutorial deployment?

Set environment variable `JMX_EXPORTER_PORT=9799`

Feature request or enhancement

For feature requests or enhancements, provide this information, please:

Which use case/requirement will be addressed by the proposed feature?

<Your answer>

Implementation ideas (optional)

I already created a Pull Request https://github.com/debezium/debezium-server/pull/105