Not all shard metrics seen without the use of -compatible-mode

[sre-tvernick]

Describe the bug
Not all shard level metrics appear without the use of --compatible-mode

To Reproduce
Steps to reproduce the behavior:

1. Start exporter with "--collector.shards", "--collector.diagnosticdata"
2. Get available /metrics
3. Start exporter with "--compatible-mode", "--collector.shards", "--collector.diagnosticdata"
4. Get available /metrics

Expected behavior
Show all metrics without the compatible-mode flag.

with compatible-mode metrics
mongodb_mongos_db_collections_total
mongodb_mongos_db_data_size_bytes
mongodb_mongos_db_index_size_bytes
mongodb_mongos_db_indexes_total
mongodb_mongos_sharding_balancer_enabled
mongodb_mongos_sharding_chunks_is_balancer_running
mongodb_mongos_sharding_chunks_total
mongodb_mongos_sharding_collections_total
mongodb_mongos_sharding_databases_total
mongodb_mongos_sharding_shard_chunks_total
mongodb_mongos_sharding_shards_draining_total
mongodb_mongos_sharding_shards_total

vs without that flag
mongodb_mongos_sharding_shard_chunks_total
mongodb_shards_collection_chunks_count

• OS,
• environment (docker, k8s, etc) docker
• MongoDB version v7.0.15