It's DLT Stable, so whatever DBR that's using under the hood. Here's the JSON of the warning with UIDs etc redacted
{
"id": "redacted",
"sequence": {
"data_plane_id": {
"instance": "execution",
"seq_no": redacted
},
"control_plane_seq_no": redacted
},
"origin": {
"cloud": "Azure",
"region": "canadacentral",
"org_id": redacted,
"pipeline_id": "redacted",
"pipeline_type": "WORKSPACE",
"pipeline_name": "redacted",
"cluster_id": "redacted",
"update_id": "redacted",
"request_id": "redacted",
"uc_resource_id": "redacted"
},
"timestamp": "2024-01-17T15:15:47.639Z",
"message": "Notebook:/redacted/dlt_meta_pipeline used `DataFrame.collect` function that will be deprecated soon. Please fix the notebook.",
"level": "WARN",
"details": {
"unsupported_operation": {
"operation": "COLLECT_TO_DRIVER"
}
},
"event_type": "unsupported_operation",
"maturity_level": "STABLE"
}